Dairy Biosecurity

First Case of Avian Flu Detected in Wisconsin Dairy Herd

Sun, 14 Dec 2025 20:27:43 GMT

A case of highly pathogenic avian influenza (HPAI) has been detected in a dairy herd in Dodge County, Wisconsin, the Wisconsin Department of Agriculture, Trade and Consumer Protection (DATCP) announced Sunday. This marks the first confirmed detection of the virus in dairy cattle in the state.

Dodge County, Wisconsin

(USDA)

The herd was identified through routine National Milk Testing Strategy screening, not the surveillance required for moving cattle across state lines. The affected farm has been quarantined, and any cattle showing signs of illness are being separated for treatment.

Bird flu has already been detected in poultry flocks in Wisconsin. On Dec. 9, state officials reported HPAI in a flock in Marquette County, which is just one county away from the affected dairy herd.

HPAI in dairy cattle has been documented in the U.S. before, with the first detections reported in March 2024 in dairy herds in Texas and Kansas. Since then, there have been more than 1,000 confirmed cases across 18 states, primarily through targeted testing and monitoring programs. While the pace of new detections has slowed in recent months, one additional confirmed case has been reported in California within the past 30 days, indicating the virus is still a threat.

HPAI Confirmed Cases in the Last 30 Days

(USDA)

Total HPAI Confirmed Cases

(USDA)

A Wake-Up Call for Dairy Biosecurity

The Wisconsin case comes as new research from Farm Journal highlights ongoing gaps in dairy biosecurity practices nationwide. A survey of more than 300 dairy producers, presented at the MILK Business Conference, found that while many operations report having biosecurity plans in place, consistent implementation and regular review remain a challenge.

According to the survey, 68% of farms with at least 250 cows say they have a biosecurity plan, yet 34% of those producers acknowledge they do not routinely review or update it. The findings point to vulnerabilities at a time when disease threats such as HPAI, New World screwworm and bovine spongiform encephalopathy continue to raise concern across the livestock sector.

(Farm Journal)

“We need biosecurity efforts to be more impactful at the ground level,” said Kirk Ramsey, professional services veterinarian with Neogen, who reviewed the survey results. “Not only to prevent major outbreaks, but also to protect employees and families from what could be carried home every day.”

As emerging diseases continue to challenge dairy operations, the research reinforces the importance of consistent, practical biosecurity measures to reduce risk and protect herd health.

What are the Symptoms of HPAI in Dairy Cattle?

As monitoring continues, officials are urging producers to stay alert for early signs of illness within their herds, as prompt detection and response remain key to limiting further spread. Signs of HPAI include:

Drop in milk production
Loss of appetite
Changes in manure consistency
Thickened or colostrum-like milk
Low-grade fever

State officials are monitoring the situation and working closely with the farm to contain the virus and prevent further spread. DATCP emphasized there is no concern for the safety of the commercial milk supply, as pasteurization eliminates the virus. The CDC considers the human health risk low.

Read more on HPAI in dairy:

New Research Exposes Stagnant Biosecurity Efforts in the U.S. Dairy Industry

Tue, 02 Dec 2025 19:20:34 GMT

When it comes to biosecurity, U.S. dairy farmers are more reactive than proactive and some neglect the basics, making operations vulnerable to evolving disease threats, according to new research released Tuesday at MILK Business Conference .

The study found farm hygiene and herd health aren’t top of mind on all farms and one-third of farms don’t proactively review their biosecurity plans indicating a potential lack of ongoing commitment or adaptation.

There is a silver lining: More than 70% of large dairies say they are already working on improvements, meaning some in the industry are prioritizing biosecurity.

The recent research conducted by Farm Journal, which surveyed more than 300 dairy producers, looks at trends and potential vulnerabilities that might be affecting dairy farms nationwide. As disease challenges such as highly pathogenic avian influenza (H5N1), New World screwworm (NWS) and bovine spongiform encephalopathy (BSE) continue to mount, biosecurity remains a critical concern for the industry.

“We need biosecurity efforts to be more impactful at the ground level. Not only to prevent major outbreaks, but to even protect employees and families from the things being taken home every day,” says Kirk Ramsey, Neogen’s professional services veterinarian who reviewed the biosecurity survey results.

Biosecurity Plans Lag Behind Threats

The survey reveals even among farms with established biosecurity strategies, commitment to reviewing and adapting these plans is lacking. While 68% of farmers with at least 250 dairy cows report having a biosecurity plan, 34% admit they do not review their plans regularly.

(Farm Journal)

On a positive note, 72% of dairy operators with 250-plus cows report they are currently making improvements to their biosecurity versus 58% of smaller dairy operators. Those producers are making improvements for a host of reasons, including recent on-farm or neighboring farm disease outbreaks, veterinarian recommendation and government or regulatory authority guidelines.

One respondent shares because their farm is a “closed herd” they’re not making any improvements to their biosecurity plan. All of this hints at a broader problem: Ongoing biosecurity practices might not be keeping pace with evolving threats.

Back to the Basics With Farm Security

The survey also uncovers significant gaps in fundamental farm security. More than 20% of surveyed dairies neglect to secure access to barns and animal housing. Monitoring or restricting visitor access is also a blind spot for 16% of producers, and only 33% of producers use camera surveillance to oversee their facilities. Additionally, 38% fail to control or limit access to areas where feed is stored or provided.

(Farm Journal)

Gaps in Hygiene and Herd Health

When it comes to farm hygiene and animal health practices, 72% of larger dairy operations have hand-washing stations included in their biosecurity protocol, and 75% use separate equipment for handling feed and manure. Even though more than half of respondents use technology, such as herd activity monitoring systems, to help identify sick animals, the overall picture suggests room for improvement in daily hygiene and health protocols.

(Farm Journal)

Training and Education Should Be Proactive

The approach to biosecurity training also calls for reform. The findings show a reactive pattern, with 32% of farms providing training only in response to biosecurity issues, while another 30% conduct quarterly meetings. These figures reveal substantial portions of the industry lack consistent, proactive staff education, an essential pillar of effective biosecurity management.

Chief Science Officer Jamie Jonker, Ph.D., with National Milk Producers Federation says biosecurity on dairy farms is a continuous process that requires proactive updates and employee education to keep pace with evolving disease threats.

“The National Dairy FARM Program offers comprehensive biosecurity materials and evaluation tools as well as certified FARM Biosecurity evaluators who can draft tailored plans and guide training to ensure consistent implementation,” he says. “Leveraging these resources helps producers stay ahead of risks and maintain a strong, resilient operation.”

(Farm Journal)

Cybersecurity: An Emerging Concern

Beyond biosecurity, the increasing reliance on technology introduces cybersecurity challenges. Only 29% of farmers have collaborated with cybersecurity experts to protect their farm systems and data. As farms grow more technologically interconnected, safeguarding digital infrastructure is an emerging need.

The insights from Farm Journal’s recent research paint a clear picture for the U.S. dairy industry: In an era of escalating disease threats such as H5N1 and NWS, a reactive or static approach to protection is no longer sufficient. Ultimately, this research serves as a pivotal reminder that biosecurity and cybersecurity are not one-time tasks, but dynamic, ongoing processes demanding continuous review and proactive management.

“Improvements in biosecurity will require a paradigm shift in how we see our individual operations’ vulnerabilities,” Ramsey says. “I believe there are some misconceptions around what biosecurity looks like. For many, it’s thought of as Tyvek suits and face masks, not clean boots and coveralls, and shower-in-shower-out facilities, not limited-farm entry. There are simple ways to create biosecurity plans into every operation, and there are experts in our industry building innovative solutions to the complexities of the cattle industry.”

California Issues New Ban on Dairy Cattle and Poultry Shows in Response to H5N1 Bird Flu

Thu, 09 Jan 2025 16:46:59 GMT

California State Veterinarian Dr. Annette Jones has issued a statewide ban on exhibiting dairy cattle and poultry at fairs and shows due to the ongoing spread of H5N1 Avian Influenza (Bird Flu) among dairy herds and domestic poultry. This decision, which comes in the wake of Governor Gavin Newsom’s state of emergency declaration last month, is aimed at curbing the devastating effects of the outbreak on California’s livestock and poultry industries.

“Due to the continued spread of H5N1 Bird Flu in California, the State Veterinarian has implemented a ban on all California Poultry and Dairy Cattle Exhibitions at fairs and shows immediately until further notice,” the California Department of Food and Agriculture (CDFA) announced in a press release. “This action is required to minimize the danger of exposing people and non-infected cows and birds to the disease.”

The outbreak, which began in the state in August 2024, has affected over 700 dairy herds and 60 poultry flocks, impacting more than 15 million birds across California. Within the last 30 days, USDA’s Animal and Plant Health Inspection Service (APHIS) reports that 149 new confirmed cases had been detected within the state. With new infections still being detected, the ban is a step to prevent further spread of the virus.

Currently the CDFA is urging dairy and poultry owners to take immediate action by implementing strict biosecurity measures. These include preventing the mingling of livestock with wild birds or other infected animals, avoiding the movement or sharing of potentially contaminated equipment, and ensuring rigorous sanitation practices.

“Enhanced biosecurity is essential to protecting livestock and poultry from this devastating disease,” the CDFA stated. “Producers must prevent contact with wild bird populations and avoid any practices that might facilitate the transfer of the virus.”

Clinical signs of H5N1 Bird Flu in cattle include reduced feed consumption, a marked drop in milk production—sometimes resulting in thick, colostrum-like milk or no milk production at all—respiratory distress, nasal discharge, lethargy, dehydration, fever, and abnormal feces.

The ban on exhibitions is expected to remain in effect until the outbreak is under control, with officials monitoring the situation closely.

Your Next Read: Fake Farmer Steals $8.75M In Green Energy Scam

Four States Sign on for Voluntary H5N1 Testing of Bulk Milk Tanks

Wed, 26 Jun 2024 16:32:39 GMT

On Tuesday, the U.S. Department of Agriculture (USDA) announced four states – Kansas, Nebraska, New Mexico and Texas – are launching a voluntary pilot program to test bulk milk tanks on dairy farms for Highly Pathogenic Avian Influenza H5N1.

Eric Deeble, the acting senior advisor for the H5N1 response at USDA, made the announcement. He noted that there are roughly a dozen additional states interested in participating in the testing.

“But it was important for us to get these four states going so that other states could watch how the program works and gain additional confidence,” Deeble said during a media briefing.*

Routine Bulk Milk Sampling
According to USDA, farmers who voluntarily enter the program will be able to move their herds across state lines without additional testing after bulk milk tanks or similar representative samples test negative for H5N1 for three consecutive weeks.

“Producers must also comply with continued regular weekly monitoring and testing of their herd for H5N1, but that process can happen with very little effort on the part of the producer, using routine bulk milk samples,” Deeble said during his remarks.

To date, 20 herds are now enrolled in USDA financial support programs. Deeble said that number is increasing.
FDA Announces Expanded Testing

More Food Testing

Also on Tuesday, the U.S. Food and Drug Administration (FDA) said it is expanding its H5N1 testing to a include a wider range of dairy products. The products will include aged raw-milk cheese, cream cheese, butter, and ice cream, according to Don Prater, DVM and acting director of the FDA’s Center for Food Safety and Nutrition.

In its update, FDA said it will test 155 dairy products collected from retail outlets for H5N1.
The samples being tested include dairy products processed in states that were not included in the agency’s first phase of retail research, the FDA said.

“Additional samples are being taken from areas included in our previous survey to help provide a more representative picture based on the level of dairy product production that occurs in certain regions.”

Individual State Efforts

State governments continue to take proactive measures to address H5N1 in dairy and poultry operations. These include:

Epidemiological Strike Teams
USDA has authorized additional epidemiological strike teams to assist with impacted poultry and dairy farms in Iowa. Researchers have been on the ground in Iowa, for instance, over the past few weeks, according to State Secretary of Agriculture, Mike Naig. He said USDA is conducting interviews, looking for links between cases, and trying to better understand how the virus may have been introduced into the flocks and herds. Investigations are ongoing and are intended to result in specific biosecurity recommendations that can help farmers and producers better protect their livestock going forward.

USDA Wildlife Services
USDA Wildlife Services personnel continue to work with impacted farms to assist in the surveying of disease in wildlife around Iowa poultry and dairy facilities. From wild birds to rodents, these professionals are capturing wildlife samples for testing to determine the degree to which the virus is present in wildlife on these farms. These investigations, which are ongoing, are helping to inform biosecurity recommendations as well as aid in epidemiological investigations.

*Portions of this article were reported by the States Newsroom, the nation’s largest state-focused nonprofit news organization.

USDA Identifies Ways HPAI H5N1 Has Likely Spread in Michigan Dairy and Poultry Operations

Double Trouble from Flooding and H5N1 hits Some Iowa Farms

USDA to Provide an Additional $824 million to Protect Livestock from H5N1

USDA Identifies Ways HPAI H5N1 Has Likely Spread in Michigan Dairy and Poultry Operations

Mon, 17 Jun 2024 22:29:29 GMT

On June 9, the USDA issued a report that summarizes the findings from field epidemiological investigations of disease spread between premises for 15 dairy herds and eight poultry flocks confirmed with HPAI genotype B3.13 in Michigan.

The following information is pulled from the USDA’s 2024 Highly Pathogenic Avian Influenza (H5N1) - Michigan Dairy Herd and Poultry Flock Summary (see Michigan Dairy Herd and Poultry Flock Summary ).

The information offers potential insights for how the dairy and poultry industries in states beyond Michigan likely have been impacted, as well.

A ‘Eurasian Lineage Goose’

Whole genome sequencing (WGS) of viruses from the dairy and poultry premises identified Eurasian lineage goose/Guangdong clade 2.3.4.4b, genotype B3.13 on the Michigan farms and suggests likely indirect transfer of virus from the dairy premises to the poultry premises.

USDA reports that interstate animal movement initially introduced the HPAI genotype B3.13 virus from Texas into a Michigan dairy. However, USDA says the continued disease transmission within Michigan has been determined to be multifactorial.

Transmission between farms is likely due to indirect epidemiological links related to normal business operations such as numerous people, vehicles, and other conveyances frequently moving on and off the affected dairy premises, with many of these indirect links shared between premises.

Importantly, USDA says, disease spread due to independent introduction of the virus onto dairy or poultry premises from migratory waterfowl is not supported based on both genomic and epidemiological data analysis.

Key findings identified to date and potential risk factors for local transmission in Michigan specifically, include:

Shared personnel between premises
o 20% of affected dairies’ employees and 7% of dairies’ employees family members work on other dairy premises

o 7% of affected dairies’ employees also work on poultry premises; 13% of affected dairies’ employees have family members who work on poultry premises

o 31% of dairies have employees who own livestock or poultry at their personal residence

Shared vehicles between premises
o 62% of affected dairy premises use shared vehicles to transport cattle, with only 12% of premises cleaning vehicles before use

Frequent visitors on/off premises
o 100% of affected dairy premises have regular visits by veterinarians, nutritionist/feed consultant, and/or contract haulers (e.g., cattle or manure); the majority of these visitors have direct contact with cattle

o 40% of affected dairy premises have regular visits for deadstock removal, with 20% having direct contact with cattle. Furthermore:

-53% of affected dairies utilized the same deadstock removal company and 40% had animals removed from the premises by that company within 30 days prior to clinical onset

o Milk haulers visit dairy premises, on average, 34 times within a 30-day time period. Furthermore:

-93.3% of affected dairy premises are part of the same milk co-op with at least one other affected dairy premises within the state (i.e., only one of the affected dairy herds is part of a milk co-op that none of the other 14 affected dairy herds belong to)

Disease Spread Between Dairy and Poultry Premises
Apart from the potential for resident wild birds or peri-domestic species to move and transmit the virus, the only other potential transmission routes found from dairy herds to the poultry flocks were through shared employment, housing, or movement of employees.

Approximately 22 employees of three poultry flocks worked weekend shifts at two different dairy premises. Shared housing between dairy and poultry workers was identified between three poultry premises and two dairy premises. It is also possible that dairy employees have social contact with poultry premises employees, USDA reports.

In Summary
The investigations discussed in this report, including the respective WGS information, indicate that HPAI H5N1 genotype B3.13 was introduced into Michigan through animal movement from Texas and subsequently spread within the state between dairy premises with spillover into poultry premises through multiple possible routes.

Factors that appear to be of greater risk for introduction into a dairy premises may be mitigated through enhanced biosecurity, increased animal testing, and potentially through within-state animal movement restrictions if they can be implemented without impacting animal welfare.

USDA says the willingness of Michigan producers to participate in these investigations has greatly increased the body of knowledge of HPAI H5N1 B3.13 detections in Michigan and throughout the nation; this report could not have been completed without them.

For more information on the H5N1 issue:

H5N1 Virus Found in Beef for First Time, FSIS Says

FDA Says New Round of Tests Prove the U.S. Milk Supply is Safe From H5N1 Virus

USDA Now Requiring Mandatory Testing and Reporting of HPAI in Dairy Cattle as New Data Suggests Virus Outbreak is More Widespread

Bird Flu Outbreak Reported in Minnesota Dairy Herd, the State's First

Thu, 06 Jun 2024 21:02:39 GMT

June 6 (Reuters) - The ongoing U.S. outbreak of avian flu in dairy cattle reached Minnesota on Thursday as the state announced its first infected herd.

More than 80 dairy herds have been infected with the virus across 11 states since late March, and three dairy workers have tested positive for the virus.

The Minnesota Board of Animal Health said the farmer of the affected herd reported more than 40 cows with signs of fever. The animals were tested on Monday and the U.S. Department of Agriculture’s (USDA) National Veterinary Services Laboratories confirmed the positive test on Wednesday night.

The animals are recovering, said Brian Hoefs, the state veterinarian.

Milk from the sick cows was disposed of, and the state Board of Animal Health has quarantined the entire herd for 30 days to reduce the risk of the virus spreading off the farm, the agency said. After 30 days from the last positive test result, the herd can be retested to be released from quarantine, the agency added.

“We knew it was only a matter of time before this detection would reach our doorstep,” said Hoefs. “It’s important for dairy farmers to follow the example of this herd and test sick cows.”

This was not the first Minnesota dairy farm tested for avian flu due to cattle showing signs of illness, but it was the first to confirm positive results, Hoefs said.

More samples from dairy farms could be sent to the state lab in the coming days, he said.

“Once this news gets out, then it kind of triggers other farms to consider doing the testing if they were on the fence prior,” Hoefs said. “My guess is we will see more testing later this week into next week.”

The other states that have reported infected herds so far are Colorado, Idaho, Iowa, Kansas, Michigan, New Mexico, North Carolina, Ohio, South Dakota and Texas.

Dairy cows with avian flu have died or been slaughtered by farmers after not recovering, Reuters reporting found. The USDA said that the vast majority of cows recover from the illness.

(Reporting by Leah Douglas and P.J. Huffstutter; Editing by Bill Berkrot and Lisa Shumaker)

APHIS To Require Electronic Animal ID for Certain Cattle and Bison

Tue, 30 Apr 2024 17:53:11 GMT

USDA’s Animal and Plant Health Inspection Service (APHIS) has taken another step toward limiting the impact of an outbreak of foreign animal diseases by amending and strengthening its animal disease traceability regulations for certain cattle and bison. By requiring electronic animal identification for certain cattle and bison, APHIS put into place the technology, tools and processes to help industry stakeholders quickly pinpoint and respond to a foreign animal disease outbreak.

“Rapid traceability in a disease outbreak will not only limit how long farms are quarantined, keep more animals from getting sick, and help ranchers and farmers get back to selling their products more quickly – but will help keep our markets open,” said Dr. Michael Watson, APHIS administrator.

APHIS said one to the rule’s most significant benefits for farmers and ranchers will be the enhanced ability of the United States to limit impacts of animal disease outbreaks to certain regions, which the agency called a “key to maintaining our foreign markets. By being able to readily prove disease-free status in non-affected regions of the United States, we will be able to request foreign trading partners recognize disease-free regions or zones instead of cutting off trade for the entire country. Traceability of animals is necessary to establish these disease-free zones and facilitate reestablishment of foreign and domestic market access with minimum delay in the wake of an animal disease event.”

The April announcement enhances a rule finalized in 2013 for the official identification of livestock and documentation for certain interstate movements of livestock.

The final rule applies to all sexually intact cattle and bison 18 months of age or older, all dairy cattle, cattle and bison of any age used for rodeo or recreation events, and cattle or bison of any age used for shows or exhibitions.

The rule requires official eartags to be visually and electronically readable for official use for interstate movement of certain cattle and bison, and revises and clarifies certain record requirements related to cattle.

“USDA’s final traceability rule updates the existing requirement for animal identification that has been in place since 2013, switching from solely visual tags to tags that are both electronically and visually readable for certain classes of cattle moving interstate,” said National Cattlemen’s Beef Association president Mark Eisele, a Wyoming rancher.

“Many producers are already familiar with using these visual tags and under the new rule, they will instead use electronic tags. NCBA has worked hard to secure $15 million in funding for producers to reduce the cost of implementing this change. We also remain committed to safeguarding producers’ private data and continuing to reduce the cost of ear tags for farmers and ranchers. Our industry faces a tremendous threat from the risk of a future foreign animal disease on American soil. To avoid devastating financial losses during a potential outbreak and to help producers quickly return to commerce, we need an efficient animal disease traceability system.”

USDA said it is committed to implementing a modern animal disease traceability system that tracks animals from birth to slaughter using affordable technology that allows for quick tracing of sick and exposed animals to stop disease spread. USDA will continue to provide tags to producers free of charge to jumpstart efforts to enable the fastest possible response to a foreign animal disease.

To obtain electronic ID tags at no cost, APHIS directs producers to contact their State Veterinarian.

A copy of this rule may be viewed at the APHIS website, and the rule will be published in the Federal Register in the coming weeks. This rule will be effective 180 days after publication in the Federal Register.

To learn more about animal disease traceability and how APHIS responds to animal disease outbreaks, visit www.aphis.usda.gov.

US to Test Ground Beef in States With Bird-Flu Outbreaks in Dairy Cows

Mon, 29 Apr 2024 19:59:33 GMT

The U.S. government said on Monday it is collecting samples of ground beef at retail stores in states with outbreaks of bird flu in dairy cows for testing but remains confident the meat supply is safe.

Federal officials are seeking to verify the safety of milk and meat after confirming the H5N1 virus in 34 dairy cattle herds in nine states since late March, and in one person in Texas.

Both the Centers for Disease Control and Prevention and the World Health Organization have said the overall public health risk is low, but is higher for those with exposure to infected animals.

Scientists believe outbreaks are more widespread in cows than officially reported based on findings of H5N1 particles in about 20% of milk samples. The U.S. Food and Drug Administration said on Friday that preliminary results of gold-standard PCR tests showed pasteurization killed the bird flu virus in milk, though.

The U.S. Department of Agriculture will analyze retail ground beef samples with PCR tests that indicate “whether any viral particles are present,” according to a statement. Some
dairy cows are processed into ground beef when they grow old.

The USDA on Monday began requiring lactating dairy cows to test negative for bird flu before being moved across state lines as officials seek to contain the virus.

The department said this weekend that testing is not required for cows that are shipped over state lines directly to slaughter facilities from barns where they are sold. Those
cattle only need documentation showing they were inspected by a veterinarian.

The USDA said it inspects each animal before slaughter, and all cattle carcasses must pass inspection after slaughter to enter the human food supply.

Last week USDA said it had found bird flu in a lung tissue sample from an asymptomatic dairy cow that was sent to slaughter from an infected herd. The animal did not enter the food supply, according to the department.

The USDA is now collecting beef muscle samples at slaughter facilities of dairy cattle that have been condemned to determine the presence of viral particles, according to the statement. Any positive PCR tests for retail or slaughter samples will be evaluated for live virus, the USDA said.

The USDA will also use a “virus surrogate” in ground beef and cook it at different temperatures to determine how the virus is affected, according to the statement. It said cooking meat to a safe internal temperature kills bacteria and viruses

Colombia restricted the import of beef and beef products coming from U.S. states where dairy cows have tested positive for avian influenza as of April 15, according to the USDA.

There are no known cases of bird flu in beef cattle so far.

The human case in the current outbreak was in a Texas farm worker who suffered conjunctivitis following exposure to dairy cows.

(Reporting by Tom Polansek; editing by Jonathan Oatis and Marguerita Choy)

H5N1 Mandatory Testing For Interstate Movement Of Dairy Cattle In Effect

Mon, 29 Apr 2024 19:19:16 GMT

Effective today, the USDA-Animal and Plant Health Inspection Service (APHIS) federal order
requires mandatory testing for the interstate movement of dairy cattle.

The following information and direction are from the HPAI Detections in Livestock Page :

Prior to interstate movement, dairy cattle are required to receive a negative test for Influenza A virus at an approved National Animal Health Laboratory Network (NAHLN) laboratory.

Owners of herds in which dairy cattle test positive for interstate movement will be required to provide epidemiological information, including animal movement tracing.

Dairy cattle moving interstate must adhere to conditions specified by APHIS.

USDA-APHIS says these steps are immediately required for lactating dairy cattle, “while these requirements for other classes of dairy cattle will be based on scientific factors concerning the virus and its evolving risk profile.”

Mandatory Reporting Laboratories and state veterinarians must report positive Influenza A nucleic acid detection diagnostic results (e.g. PCR or genetic sequencing) in livestock to USDA APHIS.

Laboratories and state veterinarians must report positive Influenza A serology diagnostic results in livestock to USDA-APHIS.

USDA-APHIS will provide reimbursement for testing at NAHLN labs, including samples submitted for:
(1) dairy cattle suspected of disease due to clinical signs,
(2) pre-movement testing,
(3) producers interested in the disease status of their asymptomatic animals, and
(4) samples taken from other animals on dairies associated with this disease event.

USDA Now Requiring Mandatory Testing and Reporting of HPAI in Dairy Cattle as New Data Suggests Virus Outbreak is More Widespread

A Message to the Ag Industry about H5N1

Properly Prepared Beef Remains Safe; Meat Institute Calls For Guidance to Protect Workers at Beef Facilities

A Message to the Ag Industry about H5N1

Fri, 26 Apr 2024 20:49:16 GMT

“We’re going on a bear hunt. We’re going to catch a big one… We’re not scared.”

So goes a beloved children’s book written by Michael Rosen. The story is a metaphor for how to address fear. Kay Russo, DVM, often reads it to her son and daughter, ages 4 and 6.

“This unfortunate family seems to deal with a lot of issues as they’re going on their hike,” Russo says. “Ultimately, every time they reach one of these issues, the book basically says, ‘You know, we can’t go over it. We can’t go around it. We can’t go under it. We have to go through it.’”

That story illustrates how the dairy industry must deal with the growing impact of H5N1, says Russo, Novonesis technical services manager for dairy and poultry. She’s watched the spread of the virus with alarm and urges U.S. leaders across dairy and agriculture to step up and take action.

“Address it head-on,” she says. “Don’t hide.”

As with all major threats, she says ag needs a comprehensive, cohesive plan to address the virus in dairy – and to also look at how to protect the beef, pork and poultry industries.

“At this point, I believe it’s important to take one day at a time and systematically answer the questions that we need to get answered in order to define a sustainable path forward,” Russo says.

“We have a very clear picture that it’s in the udder and is being shed in milk. But where else do we need to be concerned? That matters because that is going to define the control tactics to reduce spreading it from cow to cow. Those questions are ultimately going to be the pillar of our understanding and help to define strategies for controlling the virus in a sustainable way.”

On The Front Line
Help can’t come soon enough for dairy producers and veterinarians in the trenches working with cows.

Veterinarians such as Dr. Barb Petersen in Texas have been dealing with the virus in their clients’ dairy herds since at least March.

“It has been circulating here as early as February, based on retrospective feedback from owners and fellow veterinarians,” says Petersen, owner of Sunrise Veterinary Service in Amarillo.

By early March, she had begun sending daily emails and text messages to her Texas Panhandle dairy clients who needed answers and support.

Petersen, who has been in practice 15 years, did her best to provide both. But she didn’t know what she was dealing with. Neither did any other veterinarian Petersen reached out to within 200 miles of her practice.

“We started to text and email each other, and give summaries of ‘OK, here’s the test that this doctor has run. Here’s what another colleague has run,’” Petersen recalls.

“We tested for every single viral bacterial mycotoxin, lepto, rumensin toxicity, nitrates… I mean, you name it, every single thing that we vaccinate for, we tested for, for sure, right off the bat. And then even some of the things that we don’t or can’t vaccinate for. We tried to cast a really wide net.”

None of the initial tests, conducted by the Texas A&M Veterinary Medical Diagnostic Laboratory (TVMDL), provided an answer.

Recurring Symptoms Emerge

Some members of the animal health community suspected winter dysentery – an acute, highly contagious gastrointestinal disorder that can affect housed dairy cattle of all ages.

Petersen was skeptical.

“The first clinical symptom I saw was cows that had indigestion. They had manure that wasn’t well-digested, manure with particles of feed in it,” she says.

As she checked more cows and talked with colleagues, more information came to light and she began to identify recurring symptoms: thick, colostrum-like milk; lesions on cow vulvas; high temperatures; respiratory distress; a drop in feed consumption; and a corresponding lack of rumination. None of it added up to winter dysentery.

“This is a really strong and fierce reminder to keep your hands on the cows,” Petersen says. “It’s wonderful to have data, but you have to trust and then verify.”

When Russo at Novonesis got news of the problem from a colleague, she called Petersen.

Russo has worked as a dairy veterinarian and is also a board-certified poultry veterinarian. She and Petersen discussed what kinds of tests had already been done and what health concerns had been ruled out.

“I said, ‘You know, I may sound like a crazy person, a tinfoil-hat-wearing person, but this sounds a bit like (highly pathogenic avian) influenza to me. We’ve seen this particular strain of influenza that’s been circulating, that’s been jumping into mammalian hosts,’ and I kind of left it there,” Russo recalls.

More conversations between Russo, Petersen and other veterinarians ensued. Russo encouraged Petersen to collect some of the dead birds she had encountered at the dairies and submit them to TVMDL for testing, which she did.

On March 19, Petersen received a call from the Texas lab, confirming the wild birds were positive for H5N1.

At about the same time, barn cats at the dairies Petersen worked with were getting sick and starting to die. They had consumed some of the H5N1-infected birds and milk that had not been pasteurized.

“I spent one weekend picking up dead birds and the next weekend picking up dead cats. It was very sad,” Petersen says.

Science Provides Answers
Petersen sent some of the dead cats and a pooled sample of milk to TVMDL pathologists for testing. Because of their heavy workload, she sent the same material to a former veterinary classmate at Iowa State University (ISU), Dr. Drew Magstadt, now a pathologist at the school’s diagnostic laboratory.

“Whenever I’ve gotten into a real jam professionally – like, you have a question that you can’t seem to find an answer to – the group of folks that have always helped me solve it have been pathologists,” Petersen says. “It’s been pathologists that I could give the clues to who helped finish the puzzle.”

On a warm March night in Amarillo, Petersen sat resting on her back porch at home when a text message from Magstadt popped up on her phone.

“There’s something in the results,” he wrote. “Can I call you?”

On the phone, Magstadt shared what he’d found in the lab tests done on the cats and milk: H5N1.

“I was like, ‘Are you serious?’” Petersen asked Magstadt. “Are you going to run those tests again?”

“Yes,” he said. “Just to make sure.”

The initial H5N1 confirmation flabbergasted Magstadt. The next day, he retested the samples to confirm the finding.

“I had thought we would find the results were negative and we would move on to other testing. So I was very, very surprised when the results came back positive,” says Magstadt, ISU clinical associate professor and a pathologist at the Iowa State Veterinary Diagnostic Laboratory.

The National Veterinary Services Laboratory (NVSL) then confirmed Magstadt’s findings. The documentation of H5N1 by NVSL in a sample of milk from a dairy cow represented an industry first.

“The most surprising part of this, in my mind, is the fact that we’re finding so much virus as we are in the milk, in the mammary gland,” Magstadt says.

‘Show Us The Data’
On April 23, the U.S. Food and Drug Administration (FDA) reported it had detected “viral particles of H5N1 avian influenza” in pasteurized milk available for purchase at grocery stores.

Russo is quick to point out this doesn’t mean the actual virus is in milk. Rather, it’s the genetic material known as RNA.

“I think the FDA needs to show us the data,” Russo says. “The fact that there is viral material in some of the milk on shelves, as detected by rt-PCR. That test doesn’t say whether it is alive or dead. Virus isolation is necessary. The first tests have not grown virus, thankfully, but we need more data.”

No unusual human illnesses have been documented. Government health officials say they have seen nothing unusual in flu activity, according to a senior official at the Centers for Disease Control and Prevention (CDC) who was interviewed for this story. The overall assessment and risk to human health remains low from H5N1, the official says.

“CDC looks for a host of flu-like symptoms,” he told “U.S. Farm Report” host Tyne Morgan during a phone interview. “They do so by looking at people coming into emergency rooms, care systems, etc.”

Yet anecdotal evidence suggests the people most likely to be infected – dairy farm workers who have their hands on cows regularly – aren’t necessarily going to doctors for treatment.

The World Health Organization (WHO) website references just one “laboratory-confirmed case of human infection with an influenza A (H5N1) virus on 1 April 2024” on a dairy farm.

“It’s a mild, mild case and the only symptom he had was pinkeye,” Sid Miller, state commissioner of the Texas Department of Agriculture, told “AgriTalk” host Chip Flory at the time, as reported on AgWeb.

That Texas case marked the second confirmed human case of influenza A(H5N1) detected in the U.S. — and the first in the dairy industry. The first documented case, identified in 2022, involved a person in Colorado who worked with infected poultry that tested positive for the virus.

During his interview with Miller, Flory asked whether the virus could impact beef cattle at some point.

“You’ve seen what’s happened in the cattle markets,” Flory said. “They’re looking at it like this is a major problem for beef.”

Problems aren’t anticipated for Texas beef cattle, which consist primarily of feedlot cattle in the Panhandle, Miller replied.

“The cattle that get it are the older lactating cows, and we don’t have those in the feedlot,” Miller explained. “I think we’re OK, but we’re certainly going to research that.”

Tip Of The Iceberg?
So far, H5N1 has been officially confirmed in only 32 herds in eight states, according to data from USDA’s Animal and Plant Health Inspection Service (APHIS).

Some veterinarians working with dairies in Texas believe the virus is more active than current data suggest. Nick Schneider, a consulting dairy practitioner, is one of them.

“The thing is, when you get into the Panhandle of Texas, I’m not sure there’s anybody (dairy farms) that did not have it,” says Schneider.

Texas is home to 335 Grade A dairies with an estimated 625,00 cows, according to information on the Texas Association of Dairymen website. More than 100 of those operations are in the Panhandle.

The virus likely is being under-reported by the dairy industry because the presence of the virus in dairy cows is new, and there are no reporting requirements, Russo says.

“It’s not a foreign animal disease like it’s considered in poultry, where there are reporting requirements,” she explains. “This is considered an emerging disease (in dairy cattle).”

The dairy industry needs to be “very forward looking” now and address the virus, advises Schneider, the Texas dairy consultant.

“Looking at what happened in the rearview mirror is great, but if you’re not looking at where you’re going, it’s really just a pointless endeavor,” he says.

To that end, he advises gaining insights and expertise in preparation for whatever new information emerges next.

“We need to think about this potentially being something we have to live with, as being a part of the industry in the future,” Schneider says. “I hope I’m wrong. I would love to be wrong about that. But it’s something that we definitely need to consider when we’re thinking of how we’re going to manage it.”

Lessons From Swine And Poultry
Russo also advocates learning the lessons from swine and poultry, which have faced a variety of viral challenges for years.

“It’s important that we don’t try to reinvent the wheel as the cattle industry, but sort of cross the aisle to interact with the poultry folks and the swine folks who have gone through this repeatedly over the years and learn from the defined principles they use and try to adapt them into the bovine space,” she says.

Both swine and poultry have modified their animal management practices from the farm to the marketplace as a result of those experiences.

“Poultry, for instance has very distinct biosecurity principles they abide by to include lines of separation,” Russo says. “One is they keep the outside world out. Another is their use of PPE (physical protective equipment) to protect employees and also the birds from anything that might be carried onto the farm.”

The latter is a message Dr. Barb Petersen has taken to heart. Petersen says she was exposed to H5N1 for more than a month before she learned about the virus and its ability to infect dairy cows and people.

“I’m very fortunate that I never got sick,” she says.

Her advice? “Protect yourselves and your people on the dairy. There’s been underreporting of the virus. Understandably, there’s been a lot of fear. But every dairy that I’ve worked with has – with the exception of one – had sick human beings at the same time they had sick cows.”

Based on that knowledge, Petersen has acquired PPE available through Texas Health and Human Services.

“All the states have personal protective equipment available. Go and get it for your dairies,” she encourages other veterinarians. “If a dairy is on the fence, just provide it to them, offer it to everybody.”

Petersen says she has worked with people infected by H5N1 who do not interact with dairy cows. “I’m talking owners and feeders who don’t usually touch cows,” she says.

Research is underway to determine how much of a health risk the virus poses to humans, Russo says.

“This is a rapidly evolving situation, and the people that are working on it are doing everything they can to ensure the safety of those individuals that are most at risk,” she says.

A Paradigm Shift
The virus continues to hit the U.S. poultry industry hard.

Cal-Maine Foods, the largest producer and distributor of fresh shell eggs in the U.S., announced April 2 that chickens at its facility in Parmer County, located in the southwest part of the Texas Panhandle, tested positive for the virus. As a result, Cal-Maine had to cull nearly 2 million chickens − 1.6 million hens and 337,000 pullets.

In the AgriTalk discussion aired earlier this spring, Flory asked Miller, the Texas ag commissioner, whether he believes state agriculture department investigators are in front of the latest issues with HPAI in dairy cattle.

“I think so,” Miller replied. “We’ve got about 10 months before the ducks and geese come back, so I think we’ll have it figured out by then.”

Moving forward, the U.S. livestock industry might operate in a new world – one where the H5N1 virus is endemic.

Russo is undaunted by the challenge.

“This is not insurmountable, but it’s an issue we need to address swiftly,” she says.

Culled dairy cows going into the food supply deserve special attention, she says.

“We need to do the work so that we can define those movement strategies for the practitioners that are being asked to write health certificates on these farms that have the virus circulating,” Russo says.

The dairy industry needs to be more proactive for the sake of the poultry industry, she adds.

“Putting our heads in the sand, and hoping it burns itself out is not going to work. It’s just not,” she says. “It would take down the entire poultry industry by doing that, because this is highly pathogenic to them.”

That is not hyperbole, Russo says: a dime-sized piece of manure with H5N1 can infect up to 1 million chickens or turkeys.

In essence, the livestock industry needs to go on a bear hunt, as the children’s story says.

‘We can’t go over it. We can’t go around it. We can’t go under it. We have to go through it.”

With that as the focus, solutions to H5N1 can be found and help delivered to livestock producers and veterinarians on the front lines and, ultimately, the U.S. agriculture industry can insure a safe food supply.

This story will be updated by Bovine Veterinarian and Farm Journal editorial staff as more information is available.

USDA Now Requiring Mandatory Testing and Reporting of HPAI in Dairy Cattle as New Data Suggests Virus Outbreak is Widespread

USDA Shares Recent H5N1 Avian Flu Sequences

Texas-Sized Problems Hit the Lone Star State, but Ag Commissioner says ‘Things are Getting Better’

Rare Human Case of Bird Flu Confirmed. Officials Believe it Began on Texas Dairy

NEW: USDA Confirms Cow-to-Cow Transmission a Factor in Avian Flu Spread

Fri, 19 Apr 2024 21:18:17 GMT

The U.S. Department of Agriculture said this week that cow-to-cow transmission is a factor in the spread of avian flu in dairy herds, but it still does not know exactly how the virus is being moved around.

Farmers and veterinarians have been waiting for confirmation on how the virus is transmitted to better control its spread. Dairy herds in eight states tested positive over the past month, along with one dairy worker in Texas.

“Those of us that have worked with influenza for a long time were fairly quickly saying, ‘Yep it moves cow to cow,’” Jim Lowe, an associate dean at the University of Illinois College of Veterinary Medicine, said on Friday. “You can’t explain the epidemiology any other way.”

Wild migratory birds are believed to be the original source of the virus. But the USDA said its investigation into cow infections “includes some cases where the virus spread was associated with cattle movements between herds.” There is also evidence the virus spread from dairy cattle premises “back into nearby poultry premises through an unknown route,” the department said.

The USDA said cows shed the virus in milk at high concentrations, so anything that comes in contact with unpasteurized milk may spread the disease. Respiratory transmission is not considered a primary way for the virus to spread in cattle, the department added.

Despite uncertainty over transmission, USDA has not imposed quarantines to restrict the movement of cattle around infected dairies, as it does with chickens and turkeys around infected poultry farms. Infected cattle appear to recover, while bird flu is usually lethal for poultry.

The USDA said it expects that minimizing cattle movement and testing those that must be shipped, along with safety and cleaning practices on farms, should avoid the need for regulatory restrictions.

Officials reported last month that bird flu primarily affected older cows, though additional data now indicates younger cattle have been affected, the USDA said.

(Reporting by Tom Polansek, Editing by Louise Heavens)

South Dakota Confirms First Case of HPAI in a Dairy Herd

Thu, 11 Apr 2024 21:41:59 GMT

The South Dakota Department of Agriculture (DANR) and the Animal Industry Board (AIB) have received confirmation from the United States Department of Agriculture’s (USDA) National Veterinary Services Laboratory (NVSL) of the detection of highly pathogenic avian influenza in a dairy cattle herd in South Dakota.

This is the first confirmed case of HPAI in a dairy operation in South Dakota.

“South Dakota Dairy Producers encourage all dairy producers to closely monitor their herd and contact their herd veterinarian immediately if cattle appear symptomatic,” said Marv Post, Chairman of South Dakota Dairy Producers, in a prepared statement. “USDA continues to emphasize that pasteurization kills the virus and that milk and dairy products are safe to consume.”

Read the complete press release here .

North Carolina Reports First Case of HPAI in Dairy Herd

Wed, 10 Apr 2024 19:59:16 GMT

The National Veterinary Services Laboratory (NVSL) has detected Highly Pathogenic Avian Influenza (HPAI) in a dairy herd in North Carolina.

The North Carolina Commissioner of Agriculture, Steve Troxle, said in a press release he is waiting for more diagnostic information from the NVSL and will work collaboratively with federal partners and dairy farmers in the state.

“We have spent years developing methods to handle HPAI in poultry, but this is new and we are working with our state and federal partners to develop protocols to handle this situation,” he said. “It is important to note the FDA has no concern about the safety or availability of pasteurized milk products nationwide.”

North Carolina is the seventh state to officially confirm the presence of HPAI in a dairy herd.

The other six states with NVSL-confirmed reports of HPAI in dairy are:

Idaho: 1 case
Kansas: 3 cases
Michigan: 2 cases
New Mexico: 4 cases
Ohio: 1 case
Texas: 9 cases

In addition, the National Milk Producers Federation reports that eight states now have dairy cattle importation requirements or restrictions:

The Federation adds that there is “no concern about the safety of the milk supply or that this circumstance poses a risk to consumer health because products are pasteurized before entering the market, per the Food and Drug Administration (FDA). Only milk from heathy animals is authorized for distribution into interstate commerce for human consumption. Additionally, pasteurization has continually proven to inactivate bacteria and viruses, including influenza, in milk.”

More information and HPAI dairy-specific resources are available at the Federation’s website, www.nmpf.org

Rare Human Case of Bird Flu Confirmed. Officials Believe it Began on Texas Dairy

Get the Facts Straight on Highly Pathogenic Avian Influenza

Minnesota Goat Confirmed to Have Highly Pathogenic Avian Influenza

Six Questions One Industry Veterinarian Says She Is Asked Most Often About HPAI

AABP Decides to Reference Cattle Disease as Bovine Influenza A Virus (BIAV)

Tue, 09 Apr 2024 20:17:20 GMT

On Sunday evening, the American Association of Bovine Practitioners (AABP), released a letter to its media partners to update them on how the organization will reference the emerging cattle disease, currently confirmed in dairy herds in six states, moving forward.

“Because this infection in cattle is not the same as highly pathogenic avian influenza (HPAI), after thoughtful consideration and discussion with many experts, the AABP will now refer to this as Bovine Influenza A Virus (BIAV), which more accurately depicts it,” wrote Geni Wren, director of marketing and communications for the organization, in an email accompanying the letter.

The letter was developed and signed by AABP executive director, Fred Gingrich, DVM, and president Michael Capel, DVM.

Gingrich and Capel are asking other organizations, state animal health officials, diagnostic labs, and state and federal agencies to use Bovine Influenza A Virus (BIAV) “so we can be consistent with our messaging and better distinguish the disease syndrome in cattle from the pathogenesis in birds. We believe it is important for the public to understand the difference to maintain confidence in the safety and accessibility of beef and dairy products for consumers,” they wrote.

The letter is available in its entirety for review here:

Six Questions One Industry Veterinarian Says She Is Asked Most Often About HPAI

Sun, 07 Apr 2024 20:16:02 GMT

The emerging issue of Highly Pathogenic H5N1 Avian Influenza (HPAI) in the U.S. dairy industry changes on nearly a daily basis.

Novonesis (a merger of Chr. Hansen and Novozymes) hosted a webinar on the issue on Friday to update producers, veterinarians and other members of the agricultural community.

“It’s a rapidly evolving situation,” lead presenter, Kay Russo, DVM, Novonesis technical services manager for dairy and poultry, North America, stressed at the beginning of the program.

“I’m getting a lot of questions, and I’m sure everybody on this call has questions. Or if you’re a veterinarian, you’re receiving them,” she said. “Again, this is a rapidly evolving situation, and what may seem correct today may be different tomorrow.”

Here are the six questions Russo said she is most frequently asked, and what her answers to them are – for now. Russo’s answers have been lightly edited for clarity.

Question #1: Is HNAI spreading from cow to cow?

Answer: Initially the thought was that every one of these animals was exposed to the disease from a bird. But at this point, there is some consideration for the fact that this may be spreading laterally. How it’s spreading is still unclear. There is some postulation that the virus is being spread in the milking parlor. Could it potentially be a mechanical spread from cow to cow on the milkers’ hands, or perhaps (on) the milking machines? Is it possible in these parlors where the humidity is high, it’s a warm environment that we’re seeing some aerosolization of the virus, so I would say that’s possible too. But there’s more work that needs to be done. But for all intents and purposes at this time, I would suspect there is some lateral transmission.

Question #2: Why are calves, younger lactation cows and the feedlot cattle not getting sick?

Answer: Ultimately, I don’t know the answer to this. More work needs to be done. The question needs to be answered. Are they truly not getting infected with a virus? Are they resistant to it, perhaps? Or is it that they are getting infected and just not demonstrating the clinical signs? We milk a lot of these dairy cows three times a day, so there’s a lot of eyes on them. In some of these instances, with the calves or in the feedlot cattle, you’re not handling them as often. We need to rely on the science to answer these questions in order to provide guidelines. I keep saying this, and I will continue to say it, we do not know what we do not measure. And we cannot provide guidelines around what we do not know.

Question #3: Is this a risk to humans?

Answer: The short answer is that it can infect humans. I know that in New Mexico, they are offering free testing to individuals that are working regularly with these infected herds. And if they are symptomatic – we’re seeing conjunctivitis and high fevers in some of them –they are being distributed Tamiflu for their use and for their families. This is a rapidly evolving situation, and the people that are working on it are doing everything they can to ensure the safety of those individuals that are most at risk.

Question #4: Is milk safe?

Answer: The FDA has stated the pasteurization process should kill the virus, and we should not see it in any saleable milk.

Question #5: Will this be a market limiting disease outbreak?

Answer: This is the major concern here, folks. These are important markets for us in this country. At this point, this is something that is absolutely a consideration. The goal here is to keep the farms in business.

Question #6: Are dairy farms a risk to poultry operations?

Answer: We’ve seen two commercial layer operations, one in West Texas and one in Michigan, be positive for highly pathogenic avian influenza this week. I know that there’s considerable amounts of work behind the scenes to determine the origin of the virus that caused the outbreak in those situations. Ultimately, in this circumstance, it’s going to be important that the cattle folks and the poultry folks come to the same table and talk and manage through this. We want to be good neighbors. These are two major industries in our country, so it’s important that the dialogue is there and continues so that we can keep (everyone) safe.

HPAI Fails to Impact Dairy Prices So Far - Why Markets Could Actually See Some Growth in the Near Future

Texas-Sized Problems Hit the Lone Star State, but Ag Commissioner says ‘Things are Getting Better’

New Regulation: Dairy Cattle Entry into Nebraska Now Requires Permit Amid HPAI Bird Flu Concerns

Mexico Taking ‘Preventative Measures’ After Bird Flu Found in U.S.

HPAI Now Detected on Ohio Dairy: Strange Bird Flu Concerns See Growth

Thu, 04 Apr 2024 16:45:08 GMT

Ohio has become the sixth state where dairy cattle have tested positive for highly pathogenic avian influenza (HPAI), also known as bird flu. A recent news release from the Ohio Department of Agriculture (ODA) reports presumptive positive results from dairy cows in Wood County.

According to officials, the cows arrived in Wood County on March 8 from a dairy in Texas. That dairy later reported a confirmed case of HPAI. The Ohio dairy operation alerted state officials when the livestock began showing signs of illness. State officials are awaiting confirmation from the U.S. Department of Agriculture.

“We have official confirmation that we do have a case at a dairy in Wood County of HPAI, which is an influenza,” says ODA Director Brian Baldridge. “We’ve been working with this in the poultry industry for about the last two-and-a-half years and it has found its way into the dairy industry. We are working diligently with the dairy, with their vets and with our Animal Health division and our state veterinarian, Dr. (Dennis) Summers, on this issue.

According to the USDA, HPAI has now been detected in five other states, including:

Texas
Kansas
New Mexico,
Idaho
Michigan

“Clinically sick dairy cattle from affected herds range from 1% to 20%, with an average of 10% of the milking herd affected. There are no confirmed reports of death loss in dairy cattle directly attributed to these detections. Most sick cows begin recovering within a few days.”

“Federal and state agencies continue to conduct additional testing from sick animals and in unpasteurized clinical milk samples from sick animals, as well as viral genome sequencing, to assess whether HPAI or another unrelated illness may be underlying any symptoms,” the ODA reports.

The agency notes that clinically sick dairy cattle from affected herds range from 1% to 20%, with an average of 10% of the milking herd affected. Currently, there are no confirmed reports of death loss in dairy cattle directly attributed to these detections with most sick cows recovering within a few days.

HPAI symptoms in dairy cattle include:

Sudden drop in milk production.
Some severely impacted cows are producing thicker, more concentrated, colostrum-like milk.
Drop in feed consumption with a simultaneous drop in rumen function, accompanied by loose feces and some fever.
Impacted herds have reported older cows in mid-lactation may be more likely to be severely impacted than younger cows, fresh cows or heifers.
Some herds have reported pneumonia and mastitis.

For more on HPAI, read:

Twelve Cases of HPAI in Dairy Cattle Confirmed in Five States

Wed, 03 Apr 2024 18:54:11 GMT

To date, 12 cases of highly pathogenic avian influenza (HPAI) have been confirmed in dairy cattle in five states.

The U.S. Department of Agriculture has made the confirmations in dairy herds in four states: Texas (7), Kansas (2), Michigan (1), and New Mexico (1).

In addition, the Idaho State Department of Agriculture announced March 28 that it had identified its first cases of HPAI in a Cassia County dairy cattle operation. The affected facility had recently imported cattle from another state and herd that had HPAI.

Fred Gingrich, DVM and executive director for the American Association of Bovine Practitioners (AABP), says the virus identified in affected dairy cows is the same virus that has affected the U.S. poultry industry since 2022.

“The assumption is the initial herds were affected by wild migratory birds,” Gingrich told Chip Flory, host of AgriTalk, on Tuesday.

Gingrich adds that government agencies, veterinarians and livestock industry groups have more questions than answers at this point about how HPAI is infecting herds, and they are not ruling out cow-to-cow transmission.

“Clinically, it looks like that’s what is happening. Some of the newly infected herds outside of Texas had purchased animals from areas there that had affected herds. That indicates that we probably have some cow-to cow transmission,” Gingrich says. “What’s not known is how does that transmission occur? Does it occur through oral secretions, through the manure, urine, or aerosolized in respiratory secretions like it is in birds? Or is there some mechanical transfer when cows are in the parlor together?”

Adopt Good Biosecurity Practices
The many unknowns at this point make the need for producers to adopt good biosecurity measures more important than ever. Gingrich says the AABP and the National Milk Producers Federation have teamed up to release a set of biosecurity guidelines for producer and veterinarian use. The guidelines and recommendations are available at bit.ly/3TGYMul.

The key points in the guidelines, Gingrich says, encourage dairy producers to minimize any opportunity for the transmission of HPAI by: minimizing livestock contact with wild, migratory birds, isolating new animals on the farm, limiting any visits to your farm to only essential workers and practicing good, general biosecurity measures.

“If you’re moving either your own cattle home from a heifer grower, or you’re purchasing animals, talk to your veterinarian about any potential screening that you might want to do for those cattle, which is just a good practice for any potential disease,” Gingrich advises. “Certainly, you just need to be careful about herd purchases when we have unknowns with an emerging viral event.”

Producers should use the same general precautions, Gingrich adds, for beef cattle and other livestock as well.

“Currently, there are no reports of HPAI in the U.S. beef herd, but certainly producers and veterinarians should be on alert to monitor and watch for any symptoms,” he says.

Five states, Delaware, Idaho, Nebraska, Tennessee and Utah, are taking additional precautions to increase their biosecurity measures. Dairy Herd Management’s Taylor Leach reports the Nebraska Department of Agriculture (NDA) has issued a restriction on the importation of dairy cattle because of the recent HPAI outbreaks. Learn more here: New Regulation: Dairy Cattle Entry into Nebraska Now Requires Permit Amid HPAI Bird Flu Concerns

Silver Linings In The Clouds
When dairy cows are affected by HPAI, they tend to be only a small percentage of the total herd.

“It only affects about 10% of the cows in a herd, and it does not cause mortality, and we’re thankful for that,” Gingrich says.

Furthermore, any risk to the U.S. public from consuming dairy and meat is very low, because pasteurization destroys the virus.

Looking Ahead
Moving forward in the days and weeks ahead, Gingrich recommends that producers work closely with their herd veterinarians and sign up for HPAI alerts as they are released by the Centers for Disease Control, USDA and other federal and state agencies.

“I think the first thing is to be on the lookout for the disease symptoms in your herd; don’t hide it. We all need to work together to continue the investigation. If you have a sudden drop in appetite and milk production in your herd, the first person you should call is your veterinarian and work through to get a diagnosis, whatever that might be,” he says.

“Secondly, we want dairy farmers to know that the veterinary community cares about you. And we certainly understand that this is a scary time. So make sure that you’re relying on your veterinarian and USDA and organizations like AABP for reliable information,” he adds.

Gingrich offers counsel for veterinarians as well. “Be aggressive with diagnostics, as the investigation is ongoing. Make sure that you are working with your diagnostic labs and state animal health officials to collect the appropriate diagnostics that we have posted on the AABP website. If you’re an AABP member, we have a reporting portal where you can identify the herds with this syndrome.”

Learn more about this evolving issue in the following articles. You can also listen to the AgriTalk discussion between Dr. Gingrich and AgriTalk Host Chip Flory at the link below:

Rare Human Case of Bird Flu Confirmed. Officials Believe it Began on Texas Dairy

APHIS Now Thinks Wild Birds Are to Blame for Highly Pathogenic Avian Influenza’s Arrival on Four U.S. Dairies

APHIS Now Thinks Wild Birds Are to Blame for Highly Pathogenic Avian Influenza's Arrival on Four U.S. Dairies

Thu, 28 Mar 2024 20:10:56 GMT

The livestock industry continues to grapple with the first confirmed cases of Highly Pathogenic Avian Influenza (HPAI), more commonly known as bird flu, in cattle. On Monday, USDA’s Animal and Plant Health Inspection Service (APHIS) confirmed a strain of HPAI was detected on four dairy farms , stating it believes wild migratory birds are to blame.

APHIS says additional testing was done on Friday, March 22, as well as over the weekend, after farms reported finding dead wild birds. Then, on Monday, March 25, APHIS said clinical samples of milk from sick cattle confirmed it was a strain of avian influenza.

“Based on findings from Texas, the detections appear to have been introduced by wild birds. Initial testing by the National Veterinary Services Laboratories has not found changes to the virus that would make it more transmissible to humans,” said APHIS in a release.

APHIS says animal health experts are working to better understand the situation, as well as the characteristics of the HPAI strain. Federal and state agencies are continuing to do additional tests for HPAI, including viral genome sequencing.

“The DNA testing they’re doing on that virus is making it consistent with the wild bird flu that’s in wild bird populations, but there is additional work being done,” Justin Smith, the Kansas Animal Health Commissioner told AgriTalk’s Chip Flory this week. “Right now, it looks like it’s a wild bird incursion on our dairies, whether it be from the blackbirds or other birds.”

Related News: BREAKING: Mystery Illness Impacting Texas, Kansas Dairy Cattle is Confirmed as Highly Pathogenic Avian Influenza Strain

Federal and state agencies continue to assure consumers there is no concern about the safety of the U.S. milk supply, as the pasteurization process destroys any bacteria.

Avian influenza might be new to the dairy industry, but it’s taken a toll on the poultry industry. More than 80 million birds have been depopulated in the U.S. to control the disease in commercial poultry flocks.

“In cattle, mortality appears to be zero. We don’t have any reports of cattle directly dying from this disease,” says Dr. Fred Gingrich, cattle veterinarian and executive director of the American Association of Bovine Practitioners (AABP).

“They’re doing some genetic work on the virus itself. Mammalian markers show the given opportunity to pass from mammal to mammal, and they’re not finding any of those markers in this virus at this point in time,” Smith told Flory.

HPAI in Minnesota Goat

This is the first known case in cattle, but the first confirmed case in livestock occurred earlier this month in a young goat located in Minnesota . It’s reported the goat lived on a farm in Stevens County in the same area where a poultry flock tested positive for the illness late last month. The goat shared the same pasture and water source as the poultry flock. The case is still under investigation, but experts at University of Minnesota Extension are recommending producers check their biosecurity practices and not allow poultry, waterfowl and wildlife to share water sources or feed.

Symptoms and Signs of HPAI

According to the Texas Animal Health Commission, here’s a summary of what the industry knows right now:

The symptoms of the illness last between 10 and 14 days.
The exact cause of the illness is undiagnosed and still unknown.
Clinical signs include a sudden drop in milk production.
Some severely impacted cows are producing thicker, more concentrated, colostrum-like milk.
The problem causes a drop in feed consumption with a simultaneous drop in rumen function, accompanied by loose feces and some fever.
Impacted herds have reported older cows in mid-lactation may be more likely to be severely impacted than younger cows, fresh cows or heifers.
Dry cows and heifers do not appear to be affected.
Some herds have reported pneumonia and mastitis.

Gingrich says the main issue in impacted cattle is that they go off feed and milk production plummets.

“It appears the disease peaks in about three to four days and lasts 10 to 14 days. Older dairy cattle appear to be more clinically affected, with a more severely affected lactation,” Gingrich says. “Although it’s not consistent with every herd, it appears it’s mostly affecting animals in mid- to late lactation. It’s pretty unusual that we have something going on in older animals but not in fresh cows.”

Related News: Get the Facts Straight on Highly Pathogenic Avian Influenza

Gingrich says AABP understood there was a dire need to find answers for dairy producers.

“We understand right now that the primary impact of this disease is economic. These herds lose about 20% of their milk production for 14 to 21 days, which is a huge economic loss,” Gingrich says. “I think we always like to look for the bright side in a situation, and we don’t appear to have mortalities associated with this disease. That’s not happening, which is really great.”

What Dairy Producers Need to Know About HPAI

As more testing is done, and the industry tries to nail down the scope of the infections, Gingrich says his advice to dairy producers is simple: Be on the lookout for symptoms in your heard, and if you see an issue, immediately report it.

“Don’t hide it, we all need to work together to continue the investigation,” Gingrich says. “If you have a sudden drop in appetite and milk production in your herd, the first person you should call is your veterinarian to get a diagnosis, whatever that might be. Secondly, we want dairy farmers to know the veterinary community cares about you. We certainly understand this is a scary time. So, make sure you’re relying on your veterinarian and USDA and organizations such AABP for reliable information.”

The Kansas Animal Health Commission says the cases came on subtly, and dairies have already worked to step up biosecurity efforts to contain any potential outbreak.

Gingrich says his advice to veterinarians is to be aggressive with diagnostics.

“Even though we have these four positive samples, the investigation is ongoing,” Gingrich adds. “So, make sure you are working with your diagnostic labs and your state animal health officials to collect the appropriate diagnostics posted on our website. If you’re an AABP member, we have a reporting portal where you can identify the herds with this syndrome.”

BREAKING: Mystery Illness Impacting Texas, Kansas Dairy Cattle is Confirmed as Highly Pathogenic Avian Influenza Strain

Thu, 28 Mar 2024 19:23:32 GMT

A mystery illness that’s impacted dairy herds in the Texas Panhandle, New Mexico and Kansas now has a diagnosis : Influenza A. USDA says genetic sequencing revealed it’s the same strain of Highly Pathogenic Avian Influenza (HPAI) that’s been in the U.S. for two years .

APHIS says the “National Veterinary Services Laboratories” detected Influenza “A” in samples from several impacted herds in Texas, Kansas and New Mexico. The virus is carried by wild waterfowl, which experts think is how the illness is spreading. Even with the diagnosis, USDA is still not recommending movement restrictions of animals.

According to the Texas Department of Agriculture, Texas Agriculture Commissioner Sid Miller received confirmation from the United States Secretary of Agriculture, Tom Vilsack, and the Animal and Plant Health Inspection Service (APHIS) that the mystery disease has been identified as a strain of Highly Pathogenic Avian Influenza (HPAI) commonly known as Bird Flu. To date, three dairies in Texas and one in Kansas have tested positive for HPAI.

USDA reports that affected dairy cows do not appear to be transmitting the virus to other cattle within the same herd. APHIS says based on findings from Texas, “the detections appear to have been introduced by wild birds. Initial testing by the National Veterinary Services Laboratories has not found changes to the virus that would make it more transmissible to humans, which would indicate that the current risk to the public remains low.”

APHIS also says federal and state agencies are moving quickly to conduct additional testing for HPAI, as well as viral genome sequencing, to better understand the situation, including characterization of the HPAI strain or strains associated with these detections.

The Texas Department of Agriculture (TDA) also says they are “vigilantly monitoring this outbreak.”

“This presents yet another hurdle for our agriculture sector in the Texas Panhandle,” Miller said in a statement. “Protecting Texas producers and the safety of our food supply chain is my top priority. The Texas Department of Agriculture will use every resource available to maintain the high standards of quality and safety that define Texas agriculture.”

Related News: Minnesota Goat Confirmed to Have Highly Pathogenic Avian Influenza

Officials are strongly advising dairy producers to use all standard biosecurity measures. They note it’s important for producers to clean and disinfect all livestock watering devices and isolate drinking water where it might be contaminated by waterfowl. Farmers are also being asked to notify their herd veterinarian if they suspect any cattle within their herd are displaying symptoms of this condition.

“Unlike affected poultry, I foresee there will be no need to depopulate dairy herds,” Miller added. “Cattle are expected to fully recover. The Texas Department of Agriculture is committed to providing unwavering support to our dairy industry.”

As AgWeb and AgDay first reported last week , dairy farmers in the Texas Panhandle, NewMexico and Kansas were dealing with quite the mystery. Something is causing milk production to nosedive, and veterinarians and state officials can’t pinpoint what it is. In affected cowherds, the issue impacts nearly 10% of the animals, causing reduced feed consumption and a 10% to 20% decline in milk production.

A Texas dairy farmer told Farm Journal the mystery illness acts similar to the flu and impacts only older cows. While the majority of cases are being reported in Texas, the American Association of Bovine Practitioners (AABP), the nation’s largest cattle veterinary association, told Farm Journal last week they have some veterinarian members in New Mexico and Kansas who also reported symptoms.

Milk Still Safe to Drink, Meat Safe to Eat

The dairy industry sent out a join release following the news, reminding consumers milk is still safe to drink.

“Importantly, USDA confirmed that there is no threat to human health and milk and dairy products remain safe to consume. Pasteurization (high heat treatment) kills harmful microbes and pathogens in milk, including the influenza virus,” said the National Milk Producers Federation (NMPF), the International Dairy Foods Association (IDFA), the U.S. Dairy Export Council (USDEC), and Dairy Management Inc. (DMI) in a joint statement.

“Also, routine testing and well-established protocols for U.S. dairy will continue to ensure that only safe milk enters the food supply. In keeping with the federal Grade ‘A’ Pasteurized Milk Ordinance (PMO), milk from sick cows must be collected separately and is not allowed to enter the food supply chain. This means affected dairy cows are segregated, as is normal practice with any animal health concern, and their milk does not enter the food supply. Consumers in the United States and around the world can remain confident in the safety and quality of U.S. dairy,” the statement said.

The National Cattlemen’s Beef Association (NCBA) also released a statement on Monday, saying they are aware that USDA confirmed HPAI in samples collected from dairy cattle in the United States. They say it’s important to note the agency confirmed there is no threat to human health, and milk and meat remains safe to consume.

“At present, HPAI has not been detected in beef cattle. However, producers are encouraged to implement enhanced biosecurity measures on their farms and ranches to help protect their herds,” NCBA said in a statement.

The Meat Institute also reminded consumers that meat is still safe to consume.

“According to the Centers for Disease Control Prevention (CDC) and USDA food safety experts, properly prepared beef is safe to eat,” said Julie Anna Potts, CEO of the Meat Institute. “HPAI cannot be transmitted to humans by eating meat or poultry products.”

The Meat Institute also asked the White House and trade officials to make sure uninterrupted trade remains a priority.

“We call on Biden Administration officials to anticipate international trade concerns and encourage our trading partners to abide by internationally recognized scientific standards as determined by the World Organisation for Animal Health (WOAH),” added Potts.

Symptoms Being Reported

AABP reported to Farm Journal the symptoms veterinarians are experiencing.

“It appears that the disease peaks in about three to four days and lasts 10 to 14 days. Older dairy cattle appear to be more clinically affected, with a more severely affected lactation,” says Dr. Fred Gingrich, cattle veterinarian and executive director of AABP. “And although it’s not consistent with every herd, it appears that it’s mostly affecting animals that are in mid- to late lactation. It’s pretty unusual that we have something going on in older animals, and it’s not in fresh cows.”

Gingrich says AABP understood there was a dire need to find answers for dairy producers.

“We understand right now that the primary impact of this disease is economic. These herds lose about 20% of their milk production for 14 to 21 days, which is a huge economic loss,” Gingrich says. “I think we always like to look for the bright side in a situation, and we don’t appear to have mortalities associated with this disease. That’s not happening, which is really great.”

As the industry works to uncover the factors causing the disease, Gingrich says what makes pinpointing the cause so difficult is trying to decipher what the main symptoms of the illness are versus the secondary symptoms and related issues.

“It’s not a pneumonia outbreak, as far as we can see, and it’s not a mastitis outbreak. I think that some of those things that we’re seeing on farms are probably secondary to the initial agent that’s causing cows to go off feed, and every dairy farmer knows that a cow that doesn’t eat is at risk to get other syndromes and other diseases. I think that’s what’s occurring right now.” he adds.

According to the Texas Animal Health Commission (TAHC), here’s a summary of what the industry knows at this time:

The symptoms of the illness last between 10 and 14 days.
The exact cause of the illness is undiagnosed and still unknown.
Clinical signs include a sudden drop in milk production.
Some severely impacted cows are producing thicker, more concentrated, colostrum-like milk.
The problem causes a drop in feed consumption with a simultaneous drop in rumen function, accompanied by loose feces and some fever.
Impacted herds have reported older cows in mid-lactation may be more likely to be severely impacted than younger cows, fresh cows or heifers.
Dry cows and heifers do not appear to be affected.
Some herds have reported pneumonia and mastitis.

Texas officials say they are working with USDA to further monitor and evaluate reported cases.

“We’re trying to rule out infectious diseases in anything that might be related to feed or water or any kind of supplementation that these animals are receiving,” Dr. Lewis R. “Bud” Dinges, TAHC executive director and Texas state veterinarian, told Farm Journal last week.

Signs to Look For

Gingrich says both dairy producers and veterinarians should be on high alert and stay vigilant with biosecurity measures.

If you’re a dairy producer, Gingrich says these are some signs to look for:

Rapid onset of cows that aren’t eating
Either a drop in rumen activity or more feed in the bunk at the end of the day
A substantial loss in milk production

“These things are key,” says Gingrich. “Don’t just think you might have a bad batch of feed or that you have a respiratory outbreak and just need to vaccinate. If you see any of these issues, immediately call your veterinarian. I think that is important. I think the other thing that is important is, as with any disease, make sure you’re documenting it with good recordkeeping on who’s affected, when they are affected, et cetera. Good recordkeeping on sick cows applies to any disease. So I would encourage you to do that, as well.”

Texas Department of Agriculture says the Texas dairy industry is essential to the state, contributing roughly $50 billion in economic activity across the state. Texas also ranks fourth in milk production nationwide and continues to be a key player in the dairy industry.

USDA Proposes Amendments to APHIS's Traceability Regulations

Thu, 19 Jan 2023 20:04:19 GMT

USDA published a proposed rule which would amend U.S. animal disease traceability regulations to require eartags in cattle and bison that are both visually and electronically readable — electronic identification (EID) tags.

Some changes have been made to a prior APHIS plan, including now the agency using the term EID tags instead of radio frequency identification (RFID) tags. APHIS said that is to accommodate the potential for future technologies other than RFID relative to the tags.

Industry Responds

Ethan Lane, vice president of government affairs at NCBA, broke down the timeline for the transition to EID tags in Thursday’s AgriTalk.

“We currently have the RFID tag rule that we saw at the end of the Trump administration that took a three or four year period to ramp up and transition to,” Lane says. “This EID tag will go live as soon as it is finalized, which is likely to be a year to 18 months.”

What’s at Stake

The EID system is aimed at helping the U.S. cattle industry deal with the emergency response to animal disease events, with APHIS concluding that while foot and mouth disease (FMD) and other diseases have been largely excluded from the U.S., “exclusion of every high impact disease through every pathway of introduction is likely an unachievable task.”

Kent Bacus, NCBA’s executive director of government affairs, echoes APHIS, saying FMD is one of his association’s biggest concerns.

“We haven’t had a case of FMD in the U.S. since the 1920s, and there hasn’t been FMD in North America since the 1950s,” he says. “We have a very naive herd that would be devastated by FMD, as would other hoofed livestock.”

Disease management tactics aside, Bacus says the domino affect FMD would have on the supply chain that is continuously being soddered and broken would be “catastrophic.” He points to highly-pathogenic avian influenza (HPAI) and African swine fever (ASF) as examples.

The Gameplan

Under the proposed rule, APHIS would require tags to be used that are both visually and electronically readable for interstate movement of cattle and bison six months after a final rule is published in the Federal Register.

Comments on the APHIS proposed rule are due Mar. 20. There is not yet a definitive date when the plan will finally be in place.

Asian Longhorned Tick Marches into 17 States

Thu, 10 Feb 2022 21:44:57 GMT

What kind of pest can move into a country and sweep across a third of it in only four years? The Asian longhorned tick (ALT), for one.

A native of southeast Asia, the tick’s presence was formally recognized in the U.S. in 2017 in New Jersey. The tick was found on an imported Icelandic sheep and confirmed by the Rutgers Center for Vector Biology.

By last September, the U.S. Centers for Disease Control (CDC) had confirmed the tick (Haemaphysalis longicornis) is now present in at least 17 states: Arkansas, Connecticut, Delaware, Georgia, Kentucky, Maryland, Missouri, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Rhode Island, South Carolina, Tennessee, Virginia, and West Virginia.

Many Tick Species
Ticks are a growing concern for public health officials. There are about 90 difference tick species in the U.S., and tick bites and tick-borne diseases more than tripled here between 2004 and 2016, according to the CDC. There were more than 70,000 cases of diseases spread by ticks in the U.S. in 2016 alone.

So how concerning is the ALT, relative to other tick species in the U.S.?

Researchers are unsure because the tick is relatively new here. The good news is while the ALT can carry a virus that does contribute to human hemorrhagic fever in eastern Asia, there have been no pathogens associated with ALT in the U.S., according to researchers at John Hopkins Medicine.

However, the ALT can be a parasitic problem in birds, wildlife, livestock and even dogs and cats. While the ALT has been found in limited numbers on horses, pigs, sheep, goats and chickens, it can cause economic losses via the disease, T. orientalis, in dairy and beef cattle, according to Kevin Lahmers, a veterinary pathologist at Virginia Tech.

It also is often present on pasture in large numbers. “It’s called hyperendemic. There can be hundreds of ticks on a person 30 to 60 seconds after they get off their ATV after they drive through a field,” Lahmers says. “You can find a density of 10 per blade of grass. That’s just a little weird, in my opinion, to think about that number of ticks,” he adds.

Common Characteristics
Research shows the Ikeda strain of T. orientalis can lead to severe clinical signs and death of up to 5% of affected animals, according to Drs. Kelcey D. Dinkel and David R. Herndon, respectfully, Department of Veterinary Microbiology & Pathology, Washington State University. They reported their findings in a March 2021 article published in Parasites & Vectors.

Common symptoms of T. orientalis in cattle are similar to anaplasmosis and include fever, anemia, jaundice and lethargy, Lahmers reports. However, the majority of cattle that contract the disease appear to be asymptomatic or minimally affected.

“We know that because whenever we find clinical cases, we sometimes see that 75% to 100% of the herd is positive at the time of the first detection of a clinical animal,” he reports. “So, some herds can have it without anyone knowing it.”

Once cattle are infected by the parasite, they often carry a large ALT load.

“The Asian longhorned tick has some things about it that make it challenging to address,” Lahmers says.
One, it reproduces by parthenogenesis, meaning it doesn’t need a mate.

“All of the ticks that have been observed in the United States so far are female. Because it doesn’t have to find a mate to reproduce, it can spread faster,” he says.

High Population Numbers
A single female ALT can create a large population of ticks. It produces 1,000 to 2,000 eggs at one time, according to the USDA Animal and Plant Health Inspection Service (APHIS).

Also, because the ticks reproduce asexually, it appears there’s a shortened life cycle rather than a year-long life cycle. “We can see multiple stages – the larva, nymph, and adult – all at the same time on the same animal,” Lahmers explains.

And then there’s the issue of the sheer number of ticks that Lahmers and veterinarians sometimes see on an animal or in a pasture. The ticks can remain infected on a pasture for up to two years under favorable conditions

There is no effective treatment other than supportive care for clinically ill animals. Tick control, pasture management, and maintaining a good plane of nutrition are important preventive measures that can be implemented, Lahmers says.

Currently a PCR test is available on blood or by submitting the spleen of necropsied animals to differentiate the disease from anaplasmosis. If veterinarians or producers suspect the disease in their area, they are encouraged to let their state department of agriculture know.

Dairy Biosecurity

First Case of Avian Flu Detected in Wisconsin Dairy Herd

New Research Exposes Stagnant Biosecurity Efforts in the U.S. Dairy Industry

Biosecurity Plans Lag Behind Threats

Back to the Basics With Farm Security

Gaps in Hygiene and Herd Health

Training and Education Should Be Proactive

Cybersecurity: An Emerging Concern

California Issues New Ban on Dairy Cattle and Poultry Shows in Response to H5N1 Bird Flu

Four States Sign on for Voluntary H5N1 Testing of Bulk Milk Tanks

USDA Identifies Ways HPAI H5N1 Has Likely Spread in Michigan Dairy and Poultry Operations

Bird Flu Outbreak Reported in Minnesota Dairy Herd, the State's First

APHIS To Require Electronic Animal ID for Certain Cattle and Bison

US to Test Ground Beef in States With Bird-Flu Outbreaks in Dairy Cows

H5N1 Mandatory Testing For Interstate Movement Of Dairy Cattle In Effect

A Message to the Ag Industry about H5N1

NEW: USDA Confirms Cow-to-Cow Transmission a Factor in Avian Flu Spread

South Dakota Confirms First Case of HPAI in a Dairy Herd

North Carolina Reports First Case of HPAI in Dairy Herd

AABP Decides to Reference Cattle Disease as Bovine Influenza A Virus (BIAV)

Six Questions One Industry Veterinarian Says She Is Asked Most Often About HPAI

HPAI Now Detected on Ohio Dairy: Strange Bird Flu Concerns See Growth

Twelve Cases of HPAI in Dairy Cattle Confirmed in Five States

APHIS Now Thinks Wild Birds Are to Blame for Highly Pathogenic Avian Influenza's Arrival on Four U.S. Dairies

Related News: BREAKING: Mystery Illness Impacting Texas, Kansas Dairy Cattle is Confirmed as Highly Pathogenic Avian Influenza Strain

HPAI in Minnesota Goat

Symptoms and Signs of HPAI

Related News: Get the Facts Straight on Highly Pathogenic Avian Influenza

What Dairy Producers Need to Know About HPAI

BREAKING: Mystery Illness Impacting Texas, Kansas Dairy Cattle is Confirmed as Highly Pathogenic Avian Influenza Strain

Related News: Minnesota Goat Confirmed to Have Highly Pathogenic Avian Influenza

Milk Still Safe to Drink, Meat Safe to Eat

Signs to Look For

USDA Proposes Amendments to APHIS's Traceability Regulations

Industry Responds

Read more: JEV: Don’t Wait Until It’s Too Late

What’s at Stake

Read more: Spike in Illegal Pork Brought in by Travelers in Taiwan Prompts Warning

The Gameplan

Asian Longhorned Tick Marches into 17 States