State agriculture officials say the deadly bird flu virus is suspected on two more Iowa chicken farms and two more turkey operations.
Officials say initial tests indicate the virus on two turkey farms in Buena Vista County. One has 50,000 birds and the count on the other farm is still pending. A chicken farm in that county with 63,000 laying hens also tested positive.
Tests also returned positive on a chicken breeder farm with 19,000 birds in Kossuth County.
A U.S. Department of Agriculture laboratory in Ames will run additional tests to confirm.
That lab Wednesday confirmed the virus on farms in Sioux, O'Brien and Osceola counties with nearly 6 million chickens.
The new cases bring to 10 million the Iowa birds that have either been or will be euthanized.