Good biosecurity practices can help keep HPAI out of Iowa herds

Iowa State University extension beef veterinarian Grant Dewell said it is believed that the virus is transmitted from cow to cow during milking. As of now, beef cattle have not been identified with the disease, and this is most likely due to the mammary gland being the primary involved tissue.

"Clinical signs of affected cows are reduced appetite and milk production and thickened discolored milk," he said. "If you suspect HPAI in your cow herd, contact your veterinarian for appropriate diagnosis and testing."

There is no specific therapy for infected cattle, and most will recover on their own. Supportive care can be beneficial. There is no vaccine for HPAI in the U.S.

"The virus has been transmitted to cats and, in two cases, a dairy worker, but transmission to humans is considered a low health risk," he said. "General personal protection such as gloves, coveralls, and eye protection are recommended."

Dewell said good biosecurity practices should be implemented by beef producers to protect their herds.

"If possible, minimize access of wild birds to cattle, and do not utilize unpasteurized colostrum or milk from dairy farms in your beef herds," he said. "Isolate new animals for at least 21 days from your herd."