Prevention

Breaking: Mexican Border Closed Again as New World Screwworm Comes Within 370 Miles of the U.S.

Thu, 10 Jul 2025 02:18:04 GMT

On July 8, Mexico’s National Service of Agro-Alimentary Health, Safety and Quality reported a new case of New World screwworm (NWS) in Ixhuatlan de Madero, Veracruz, Mexico, which is approximately 160 miles northward of the current sterile fly dispersal grid on the eastern side of the country and 370 miles south of the U.S./Mexico border.

This new northward detection comes approximately two months after northern detections were reported in Oaxaca and Veracruz, less than 700 miles away from the U.S. border, which triggered the closure of our ports to Mexican cattle, bison and horses on May 11, 2025 .

While USDA announced a risk-based phased port re-opening strategy for cattle, bison and equine from Mexico beginning as early as July 7, 2025 , this newly reported NWS case raises significant concern about the previously information shared by Mexican officials and severely compromises the outlined port reopening schedule of five ports from July 7 to Sept. 15. Therefore, in order to protect American livestock and the U.S. food supply, Secretary of Agriculture Brooke Rollins has ordered the closure of livestock trade through southern ports of entry effective immediately.

“The United States has promised to be vigilant — and after detecting this new NWS case, we are pausing the planned port reopening’s to further quarantine and target this deadly pest in Mexico. We must see additional progress combatting NWS in Veracruz and other nearby Mexican states in order to reopen livestock ports along the Southern border,” Rollins says. “Thanks to the aggressive monitoring by USDA staff in the U.S. and in Mexico, we have been able to take quick and decisive action to respond to the spread of this deadly pest.”

To ensure the protection of U.S. livestock herds, USDA is holding Mexico accountable by ensuring proactive measures are being taken to maintain a NWS free barrier. This is maintained with stringent animal movement controls, surveillance, trapping and following the proven science to push the NWS barrier south in phases as quickly as possible.

In June, Secretary Rollins launched a 5-point plan to combat NWS by protecting our border at all costs, increasing eradication efforts in Mexico, and increasing readiness. USDA also announced the groundbreaking of a sterile fly dispersal facility in South Texas. This facility will provide a critical contingency capability to disperse sterile flies should a NWS detection be made in the Southern U.S.

Simultaneously, USDA is moving forward with the design process to build a domestic sterile fly production facility to ensure it has the resources to push NWS back to the Darien Gap. USDA is working on these efforts in lockstep with border states – Arizona, New Mexico and Texas – as it will take a coordinated approach with federal, state and local partners to keep this pest at bay and out of the U.S.

USDA will continue to have personnel perform site visits throughout Mexico to ensure the Mexican government has adequate protocols and surveillance in place to combat this pest effectively and efficiently.

Click to enlarge.

(USDA)

Your Next Read: Protect Your Livestock: Signs of New World Screwworm

Urgency in Action: We Must Eradicate New World Screwworm

Tue, 03 Jun 2025 16:14:06 GMT

New World screwworm (NWS) continues to threaten the U.S. cattle industry. The potential impact is devastating — the larvae can kill an animal in just four to seven days if not quickly detected and treated.

Colin Woodall, National Cattlemen’s Beef Association CEO, discussed the hurdles of controlling the spread of NSW on the latest episode of the “Unscripted” podcast .

“We have to eradicate it from here,” Woodall stresses. “We need to eradicate it from Mexico. We need to eradicate it from Central America. We need to push this thing all the way back down to South America.”

The NSW fly and its larvae are flesh-eating parasites that pose a significant threat to warm-blooded animals.

“This is not just a cattle issue,” Woodall says. “This could be dogs. This can be cats. It can get into people. So, anything that is warm blooded could be a host for this flesh-eating parasite.”

Woodall says NSW is approximately 700 miles from the U.S. border, having breached the isthmus of Mexico in the states of Oaxaca and Veracruz, adding that Texas is expected to be the first point of entry if the fly continues to move north.

“We’re going to look at every eradication option possible, because we have to get rid of this thing,” he says. “This is not something that can become endemic to United States. We have to eradicate it from here.”

Woodall says the situation has been complicated by cooperation challenges with Mexico. Earlier attempts to transport sterile flies were hindered by bureaucratic obstacles, with planes unable to land and flies dying before deployment. This led Agriculture Secretary Brooke Rollins to close the border, sending a clear signal to the Mexican government about the need for more serious action.

He explains cooperation has reportedly improved, with USDA teams planning to visit Mexico to assess the current situation. The primary strategy for control involves releasing sterile flies into the wild to disrupt breeding and push the population back southward.

Woodall says NCBA is actively working on several fronts to address the threat:

Pushing for the establishment of a domestic sterile fly production facility.
Exploring genetic engineering technologies for fly control.
Investigating treatment options (such as ivermectin) and helping producers understand how to detect and treat potential infections quickly. Woodall says treatment is possible, explaining ivermectin has proven effective in killing larvae and treating wounds. However, early detection is crucial due to the rapid progression of infection.
Conducting education and awareness campaigns to explain the threat without causing panic. He says misinformation has been a significant challenge. A recent false report about NSW in Missouri caused panic and temporarily impacted cattle prices. He adds that while the threat is serious, it’s not a cause for panic.

“While everybody needs to be aware, they don’t need to panic, and that’s the thing we want everybody to understand,” Woodall summarizes.

NCBA is taking an active role in addressing the threat of NSW through education, technological exploration, government collaboration and a clear commitment to preventing its spread.

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More Than Annoyance: Flies Can Impact Health and Profits

Tue, 06 May 2025 15:16:34 GMT

With fly season approaching, now is the time to evaluate and refine your fly management plan for 2025.

“If your 2024 control efforts underperformed, consider adjusting your approach,” says David Boxler, Nebraska Extension livestock entomologist. “The best control method will depend on several factors including efficacy, cost, convenience and your current herd management practices.”

He also reminds producers that horn flies can migrate from neighboring untreated herds, masking the effectiveness of your efforts and increasing fly pressure. For this reason, Boxer recommends a comprehensive, integrated fly control.

The horn fly is one of the most damaging pests of pasture and rangeland cattle across the U.S., Boxler says in a recent “ UNL Beef Watch .”

“Adult horn flies are blood-feeding insects that take an average of 30 blood meals per day,” he says. “Their populations can build rapidly and often exceed the Economic Injury Level defined as 200 flies per animal. Once fly numbers surpass this threshold, cattle experience reduced weight gain and milk production due to fly-induced stress and altered grazing behavior.”

Observing your cattle during summer months is key to detecting fly pressure. Boxler asks, “Are they constantly tossing their heads, swishing their tails or twitching their skin?”

These signs of fly irritation indicate a more effective control strategy might be needed.

“If you are seeing flies, ticks, lice or insect damage to your cattle herd, we know there is an economic impact; however, that impact can become far greater than production or weight gain loss alone,” says Ashby Green, DVM, Neogen senior technical services veterinarian. “Insect pressure affects grazing patterns of cattle, it affects their comfort and it can lead to health issues. Some of those health issues can be definite, such as anaplasmosis.”

The vectors responsible for spreading anaplasmosis include horse flies, stable flies and ticks. This condition has been reported in most states across the U.S., while the disease has been recognized as endemic throughout the South and several Midwestern and Western states.

“With horn flies, we’re looking at mastitis risk, so that’s going to impact both dairy cattle and also our cow-calf operations,” says Jonathan Cammack, Oklahoma State University assistant professor and state extension specialist. “A lot of times, horn flies will feed on the udders of the animals, and they transfer the Staphylococcus aureus bacteria because they land on the manure, then they go back to the animal to feed and bring those bacteria with them.”

Several other conditions are propagated by flies or ticks, including pinkeye, which can be spread by face flies and causes inflammation and ulceration of the eyes. Pinkeye-affected calves are, on average, 35 lb. to 40 lb. lighter at weaning compared to healthy calves, according to a University of Kentucky report.

Cammack says that due to flies, “We’re looking at probably $6 billion in losses annually to U.S. cattle production, and that encompasses everything from actual loss in production due to decreased weight gain or decreased milk production, veterinary needs associated with treatment of cattle with exposure to pathogens from some of these insects, and then also the control measures associated with managing those individual fly species.”

Ticks present economic risks as well. Cammack says that during a 100-day growing period producers can see a decrease in total weight gain in calves by about 20 lb. For stockers, over that same 100-day period during the summer months, they can experience a decrease in weight gain by about 60 lb.

“With what current prices are, 60 lb. could translate to a significant amount of money returned when we’re talking about the few dollars that it might cost for some tick control,” he says.

(Neogen)

Controlling flies and insects: Tips to implement
Now is the time to take steps to control flies and ticks, as populations emerge with the warmer weather.

In “ Stopping Flies in 2025: Tips to Battle These Economic Pests ,” Cassandra Olds, Kansas State University Extension entomologist, shares four steps to controlling flies

Know what flies you’re dealing with.
Reduce populations.
Eliminate breeding grounds.
Consider chemical control options.

Similar to Olds, Green recommends using a multi-pronged approach to insect control. Fly tags, feed-through insect growth regulator (IGR) products, pour-ons, back rubbers and dust bags can help diminish the population. A pour-on with an IGR destroys the larval development in flies and greatly reduces the fly population. For ultimate control using a pour-on, look to a unique combination of actives within one solution that includes an IGR, an adulticide, and a synergist that supplies relief to cattle from infestations and provides producers with a reliable solution that helps minimize handling, time and labor costs.

“Both back rubbers and dust bags can be highly effective if managed correctly. Keep in mind, when these are put out to withstand the elements, including moisture and rain, it’s key to keep the dust fresh or the oil recharged in your back rubbers. Otherwise, they will diminish in their ability to control flies quickly,” Green advises.

Cammack stresses the importance of accurate dosing by the individual animal’s weight and following label guidelines.

To best control flies and insects on cattle operations, “the easy and effective way is the best way,” Green summarizes. “It’s up to you and with the help of your veterinarian to help create that combination.”

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5 Reasons Consumer Distrust In Our Food Supply Is Rising

Tue, 28 Jan 2025 20:38:14 GMT

Bread, check. Blueberries, check. As I wheel my grocery cart alongside the deli case, I’m taken aback at what I see. Rather, it is what I don’t see that has me wondering, “What in the world?” This section of my favorite grocery store is now almost completely empty, except for a couple of ham loaves and a renegade block of cheese.

In a slightly distraught tone I ask the worker behind the counter, “What’s going on?” He hesitates for a moment, then replies, “The store is in the process of changing suppliers for our deli products. We should have more of a selection next week.” Then it dawns on me: my favorite brand of deli meat and cheese, Boar’s Head, has officially been blacklisted by my go-to grocery store.

I should not have been surprised. Boar’s Head began its fall from public grace on July 26, 2024, when the company issued a recall for more than 207,528 lb. of product due to potential listeria contamination. The CDC linked the contamination to 61 illnesses and, tragically, 10 deaths. It was the worst listeria outbreak in the U.S. in over a decade.

The outbreak was ultimately traced to a production line at the company’s Jarratt, Va., plant. According to USDA inspection reports, which USA Today had to obtain through a Freedom of Information Act request, 69 reports of non-compliance were recorded at the Jarratt plant between 2023 and 2024. What was in those reports was unsettling. Documentation of insects live and dead, black and green mold, mildew, dripping and standing water, as well as other unsanitary conditions within the plant in the weeks leading up to the July recall. In a move that was too little too late, Boar’s Head announced on Sept. 13, 2024 that the Jarratt plant would be closed permanently.

In 1906, Upton Sinclair published his famous novel “The Jungle,” which exposed the horrific conditions in the meatpacking industry at the time. The writer’s work proved to be an instant bestseller to the masses. The irony is that nearly 120 years later, one might find it hard to discern whether they’re reading a current USDA Food Safety and Inspection Service (FSIS) report or a chapter straight out of “The Jungle.”

Just One Of Many
The Boar’s Head case was only one the high profile food recalls last year. Remember the E. coli contaminated onions on McDonald’s quarter pounders? Then, Costco issued a massive recall on their Kirkland Signature brand of organic eggs because of a threat of Salmonella. And to cap off the year with the scariest illness yet, on Dec. 18, 2024, the CDC confirmed a patient in Louisiana had been hospitalized with the nation’s first severe case of avian influenza A (H5N1) virus, aka the “bird flu.”

If it seems that the number of food recalls are coming at us at a more fast and furious pace than ever, then your gut instinct is spot on. The Food and Drug Administration, which reports food and cosmetics together, says 1,908 such products were recalled in the fiscal year that ended in September. That’s the highest number since 2019. Such a constant barrage of warnings is having a serious affect on consumers’ overall psyche — and not in a positive way. According to a September 2024 Gallup report, only 57% of Americans say they have a “great deal” or “fair amount” of confidence in the government to keep food safe. This number is a 27 point decrease since 2019, and is a record low for the Gallup Consumption Habits Poll since its inception in 1999.

This explosion of 20th century foodborne illnesses has me asking the same question I asked the worker behind the deli counter: “What’s going on?”

5 Reasons To Be Skeptical
There are multiple reasons consumers have good reason to be less confident in the safety of their food.

First, there’s the government. Second, more and more of our food is imported, which makes it harder to inspect. Third, you have a growing quest for more natural food, which sometimes circumvents traditional inspection channels. Fourth, industry consolidation means only a handful of players control both the production and processing. That’s not inherently a bad thing, but if something goes wrong, it’s probably going to be big. Finally, we now have the ability, through more technology and data, to find, detect and isolate the specific source of contamination and document it.

Time For An Overhaul
Food safety policy and implementation at the government level is in need of a serious overhaul. There is a chance it could actually happen. In 2018, the previous Trump administration proposed consolidating federal food oversight into a single agency with USDA.

There are so many common sense things that a fully functioning food agency could do. For one, start with better and more noticeable country of origin labeling (COOL) on imported foods. It should be prominent, displaying the country’s flag as the primary indicator of origin. If nothing else, we’ll all get better at geography. Next, companies that embrace new technologies that prevent contamination should be rewarded with tax credits. We do it for electric cars. Why not for safer food?

Finally, the most important change needs to come in the form of accountability and transparency both from the food industry itself and the government that regulates it. That didn’t happen in the case of Boar’s Head, and 10 people lost their lives because of it. In the age of AI and social media, those FSIS plant inspection reports should be posted on platforms such as X and Facebook for the public to see in real time. Without such transparency, we’re no better off than we were back in 1906.

More Action Needed By Mexico Before Reopening Border for Feeder Cattle Imports, Says Vilsack

Sun, 19 Jan 2025 20:54:32 GMT

A letter sent Friday by outgoing USDA Secretary Tom Vilsack to Mexico’s Secretary of Agriculture Julio Antonio Berdeguê acknowledges the progress made in reopening cattle trade between the two countries following the detection of New World Screwworm (NWS) in Mexico, but says more action is needed to resume trade.

Key developments:

Technical collaboration between U.S. and Mexican teams
Full technical agreement on protocol reached on Dec. 12, 2024
Ongoing work to approve pre-export NWS inspection facilities.

Vilsack emphasizes the importance of expediting the approval process for these facilities to resume safe export as soon as possible, citing the significance of trade for a safe and affordable food supply.

The letter also addresses efforts to combat the spread of New World Screwworm:

Emergency funding has been authorized to increase sterile fly production
Production has increased fivefold in the past year
Enhanced regional response through increased dispersal, surveillance, education, and partnerships
Acknowledgment of Mexico’s partnership in sterile fly releases, movement controls, and surveillance
Shared goal to push the pest south to the Darien Gap

Vilsack requests immediate support from Secretary Berdegué for the establishment of two planned sterile fly dispersal centers in Southern Mexico to strengthen current efforts.

The letter maintains a cordial and cooperative tone throughout, emphasizing:

Shared commitments and goals
Acknowledgment of Mexico’s efforts and partnership
Expressions of gratitude for collaboration
Requests for continued support and expedited action

Industry sources say specific testing will take place Monday, Jan. 20, and that and other tests will go a long way in establishing a trade resumption timeline.

NWS Trade Impacts Started in November
As previously reported, USDA’s Animal and Plant Health Inspection Service (APHIS) suspended imports of live cattle and bison from Mexico on Nov. 22, 2024, following the detection of New World screwworm (NWS) along Mexico’s southern border. This pest can have a significant negative impact on cattle health, and U.S. authorities have been working to develop protocols to screen animals coming into the country.

Several factors are influencing the timeline and pace of reopening:

Facility inspections: Both countries have agreed on protocols, but implementation requires facility inspections and approvals.
Quarantine period: A seven-day quarantine after animal checks
Port readiness: The most important port to get moving again is Santa Teresa, New Mexico.

The temporary suspension of cattle imports from Mexico has had notable effects on the U.S. cattle market:

Reduced supply: About 250,000-300,000 fewer head of cattle are estimated to have been imported due to the suspension.
Price support: The trade disruption has been supporting feeder cattle and calf prices in the U.S.

USDA Reports First H5N1 Detection in Swine

Wed, 30 Oct 2024 19:05:00 GMT

USDA announced on Oct. 30 the first reported case of H5N1 in a pig in an Oregon backyard farm. It’s important to note there is no concern about the safety of the nation’s pork supply as a result of this finding, USDA said. This farm is a non-commercial operation, and the animals were not intended for the commercial food supply.

“The confirmed case in Oregon poses no threat to consumer health or food safety; properly handled and cooked pork products remain safe for consumption,” Bryan Humphreys, National Pork Producers Council (NPPC) CEO said in a statement. “The entire pork industry remains committed to safeguarding food safety and human and animal health.”

The case was discovered on a backyard farm that includes a mix of poultry and livestock, including swine. The Oregon Department of Agriculture announced on Friday, Oct. 25, that poultry on this farm represented the first H5N1 detection in Crook County, Oregon. On Tuesday, Oct. 29, the USDA National Veterinary Services Laboratories also confirmed one of the farm’s five pigs to be infected with H5N1, marking the first detection of H5N1 in swine in the U.S., USDA reports.  

“The livestock and poultry on this farm shared water sources, housing, and equipment; in other states, this combination has enabled transmission between species. Although the swine did not display signs of illness, the Oregon Department of Health and USDA tested the five swine for H5N1 out of an abundance of caution and because of the presence of H5N1 in other animals on the premises,” USDA wrote.

The swine were euthanized to facilitate additional diagnostic analysis. Although test results were negative for two of the pigs, and test results are still pending for two others.  
The farm has been quarantined to prevent further spread of the virus. Other animals on the farm include sheep and goats that remain under surveillance.  

“USDA’s National Veterinary Services Laboratories (NVSL) has conducted genomic sequencing of virus from the poultry infected on this farm, and that sequencing has not identified any changes to the H5N1 virus that would suggest to USDA and CDC that it is more transmissible to humans, indicating that the current risk to the public remains low,” USDA wrote.

H5N1 detections include viral genome sequencing to provide additional information of interest to medical professionals and the research community to improve understanding of the virus. Genetic sequencing for these samples is underway, but results may be inconclusive due to low viral levels in the samples, USDA said.   

Pork Producers Practice Biosecurity to Protect Pigs
Biosecurity is critical to eradicating H5N1 and other viruses. Not only does biosecurity protect the health of livestock, but it also protects the health of farmworkers and their families. For more information on protecting farmworkers, visit the CDC’s website .
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10 Powerful Take Homes to Enhance Biosecurity on Your Pig Farm
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The pork industry has worked alongside USDA’s Animal and Plant Health Inspection Service (APHIS) since 2009 to carry out the swine influenza surveillance program to identify influenza viruses circulating in swine, proactively detect reassortment viruses that could impact public health, and gain knowledge to contribute to improved animal health diagnostics and vaccines, NPPC pointed out in a statement.

“Pork producers have always been proactive and diligent about implementing biosecurity plans as part of their daily production practices to assure animals wellbeing and food safety,” Lori Stevermer, NPPC president and Minnesota pork producer said. “This detection serves as a reminder for producers of all sizes to understand and address influenza virus risks.”

What’s Next?
USDA recently approved two vaccine field safety trials for vaccine candidates designed to protect dairy cows from H5N1, and continues to explore vaccine options for other species.   As USDA takes additional steps to protect the health of livestock, it will continue to work closely with CDC to protect the health of people and FDA to protect the safety of the food supply.

“These collective, collaborative efforts have helped protect farmworkers and farmers, the health and welfare of livestock animals, and reaffirmed the safety of the nation’s food supply. The U.S. government remains committed to addressing this situation with urgency,” USDA said.

Learn more about USDA’s response to HPAI in dairy cattle.

The situation is being monitored by local public health officials, Oregon Health Authority, Oregon State Veterinarian, Oregon Department of Agriculture, as well as USDA and U.S. Department of Health and Human Services.   

Read More:
Get the Facts Straight on Highly Pathogenic Avian Influenza
Animal Health Experts Open Up About Future Disease Preparedness
How the Swine Industry Responded to H5N1 Outbreak in Dairy Cattle
A Message to the Ag Industry about H5N1