Minnesota BOAH Reports H5N1 In Dairy Cattle

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On the heels of yesterday's announcement from the State of Iowa, this morning Minnesota's Board of Animal Health has announced that state's first detection of H5N1 in dairy cows. 

Although the USDA's map currently only shows 9 states, and 84 herds affected (see map above), the number of states has increased to at least 11. 

Limited testing and surveillance, however, suggests that there are likely more infected herds yet to be reported.

News Release
For immediate release: June 6, 2024
Contact: Michael Crusan
Amid uptick in poultry detections, Minnesota reports first case of avian influenza in a dairy herd


H5N1 Highly Pathogenic Avian Influenza (HPAI) has been confirmed in a Benton County dairy herd. Over the weekend the producer noticed clinical signs in only a handful of cows, the next day more than 40 cows had signs of fever. Samples collected from sick cows in the herd on Monday were sent to the University of Minnesota Veterinary Diagnostic Laboratory where the virus was detected. The USDA’s National Veterinary Services Laboratories confirmed the results last night. According to the Centers for Disease Control and Prevention (CDC), pasteurized dairy remains safe to consume.

“We knew it was only a matter of time before this detection would reach our doorstep,” said State Veterinarian, Dr. Brian Hoefs. “It’s important for dairy farmers to follow the example of this herd and test sick cows. The more the animal health community can learn about this virus today through testing and research, the better we can equip ourselves to prevent infections tomorrow.”

Dairy farmers should monitor their herd and contact their veterinarian immediately if cows appear sick. HPAI symptoms in dairy mostly affect late-stage lactating cows and include fever, a drop in milk production, loss of appetite, and changes in manure consistency. No matter the HPAI status of a herd, biosecurity can reduce the risk of disease spreading onto or off farms:

• Consider stopping or delaying any cow movements and test for H5N1 before you move animals.
• Milk any sick cows last, after your healthy herd.
• Keep feed covered and clean up feed spills immediately.
• Provide cows a clean source of water kept secure from wildlife, especially waterfowl.
• Talk to your herd veterinarian if you notice any signs of illness in your animals.

Dairy farms are always required to dispose of milk from sick animals to remove it from the milk supply. In addition to the affected herd disposing of milk from sick cows and isolating them, the Board quarantined the entire herd for 30 days to reduce the risk of disease spread off the farm. After 30 days from the last positive test result, the herd can be retested to be released from the quarantine.

The risk to the public from this virus remains low at this time. People who work with or have direct contact with infected animals could be at risk of getting sick. The Board is working closely with the Minnesota Department of Health (MDH) on this response. MDH’s role is to monitor the health of people who have direct contact with infected animals and provide public health information and recommendations.

CDC recommends people who work with infected or potentially infected animals wear personal protective equipment (PPE) to help protect themselves from infection. More information is available on CDC’s website. Farmers can request PPE from MDH. Symptoms of avian influenza in people may include cough, sore throat, fever, red/watery eyes or discharge from the eyes. People who have questions can contact MDH at 651-201-5414.

The Board will report any new detections and updates on cow cases in Minnesota on its website. The Board has also seen a recent rise in poultry cases in the state with eight sites positive for the virus in May. Early investigations from some of those sites reveal birds were infected with the same virus strain detected in cows across the country.