Farms.com Home   News

A Second Idaho Dairy Herd Has Bird Flu. Here's What to Know

By Rachel Cohen

The U.S. Department of Agriculture confirmed a second Idaho dairy herd with avian flu late last week.

This herd, like the first group of cows that tested positive nearly three weeks ago, is at a farm in Cassia County.

Cows with the virus have reduced milk production and thicker milk consistency.

Unlike the first affected farm, which had recently imported cattle from Texas, the infected cows in this case have no connection to out-of-state cattle carrying the virus, according to the Idaho State Department of Agriculture.

Federal officials have determined that the virus is spreading from cow to cow, from cows back to poultry, between dairy farms through cattle movements and among cows not showing symptoms.

In response, ISDA has issued a quarantine on the second Cassia County farm, meaning no livestock are allowed in or out, and a ban on cattle and bison imports from out-of-state facilities where animals have tested positive remains in effect. ISDA said it recommends farmers test groups of at-risk cattle “whenever necessary,” and testing asymptomatic cattle is voluntary.

Rick Naerebout, the CEO of the Idaho Dairymen’s Association, previously said that it appeared the virus had been contained to the first Cassia County farm, as the eight sick cows there had recovered.

The Food and Drug Administration said this week it found nonviable viral evidence of the H5N1 bird flu in pasteurized milk, but stressed it believes milk is still safe to consume.

Click here to see more...

Trending Video

PRRS Eradication Strategies - Dr. DeBuse and Dr. Tousignant

Video: PRRS Eradication Strategies - Dr. DeBuse and Dr. Tousignant


In this episode of The Swine it Podcast Show, Dr. Neil DeBuse from Kalmbach Feeds and Dr. Steve Tousignant from Vaxxinova US discuss PRRS management strategies, recombination risks, whole genome sequencing, and the role of autogenous immunization programs in swine systems. They highlight practical approaches to improving immunity, reducing outbreaks, and advancing PRRS control across production systems. Listen now on all major platforms!

"Being PRRS negative sooner is a real key for eradication because every additional positive week increases production losses and viral exposure risks." - Dr. Neil DeBuse

Meet the guest: Dr. Neil DeBuse is a veterinarian at Kalmbach Feeds with more than 30 years of experience in swine health and production. His work focuses on PRRS control, biosecurity, immunity, and improving production stability across commercial swine systems in the United States and internationally.

Dr. Steve Tousignant is Director of the Swine Business Unit and Technical Services Veterinarian at Vaxxinova US, with a DVM and PhD from the University of Minnesota. His experience combines epidemiology, technical services, and practical immunization strategies designed to support consistent herd performance and long-term production stability. Don’t miss the chance to be part of the Swine Inner Circle!