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Bird Flu Found In Wisconsin Dairy Herd For First Time

By Steph Conquest-Ware

Officials said they have found bird flu in a Wisconsin dairy herd for the first time.

Tests of cow’s milk from a Dodge County farm were positive for the highly contagious virus, officials with the Department of Agriculture, Trade and Consumer Protection announced Sunday.

The Wisconsin Veterinary Diagnostics Laboratory on Thursday found the first milk sample to test positive for the virus. That was followed by a second positive test on Friday in milk from the same farm. The National Veterinary Services Laboratory confirmed both results.

The farm had previously been sampled five times with negative results. DATCP has been working with the farmers, industry partners and the state to test dairy farms since May.

Wisconsin State Veterinarian Dr. Darlene Konkle said no animals had moved onto the farm recently, and the herd was not showing signs of the illness.

“The farmer did not have a reason to suspect highly pathogenic avian influenza on the farm,” Konkle said. “There’s really no appreciable increase in morbidity, which is cow sickness, or mortality, which is death.”

Bird flu or avian flu are names for the H5N1 virus. It is potentially deadly to humans and can be spread as a result of close contact with infected animals, but so far it has not been spread from human to human, according to the Centers for Disease Control and Prevention.

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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!