Avian flu detected in Wisconsin dairy herd

 

Photo by Retiring Guy

Headline:  Dairy Herd Management, 12/13/2025

Taylor Leach reports:

A case of highly pathogenic avian influenza (HPAI) has been detected in a dairy herd in Dodge County, Wisconsin, the Wisconsin Department of Agriculture, Trade and Consumer Protection (DATCP) announced Sunday. This marks the first confirmed detection of the virus in dairy cattle in the state. [emphasis added]

The herd was identified through routine National Milk Testing Strategy screening, not the surveillance required for moving cattle across state lines. The affected farm has been quarantined, and any cattle showing signs of illness are being separated for treatment. 

Bird flu has already been detected in poultry flocks in Wisconsin. On Dec. 9, state officials reported HPAI in a flock in Marquette County, which is just one county away from the affected dairy herd. 

HPAI in dairy cattle has been documented in the U.S. before, with the first detections reported in March 2024 in dairy herds in Texas and Kansas. Since then, the virus has been confirmed in more than 1,000 dairy herds across 18 states, primarily through targeted testing and monitoring programs. While the pace of new detections has slowed in recent months, one additional confirmed case has been reported in California within the past 30 days, indicating the virus is still a threat.

Related posts:

December 1-15, 2025

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Turkey flocks in North Dakota and South Dakota hit with avian flu.  (12/12)

Indiana boosts its avian flu outbreak tally to 64.  (12/11)

Australia awaits its first case of avian flu.  (12/9)

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Japan and South Korea report outbreaks of avian flu.  (12/8)

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Latest avian flu research from Iowa State University.  (12/6)

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Avian flu kills scores of geese in rural Manitoba Canada.  (12/6)

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November 15-30, 2025

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North Carolina reports first case of avian flu since January.  (11/21)

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November 1-15, 2025

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Avian flu kills elephant seals on Heard Island south of Australia.  (10/25)

Widespread avian flu infections of wild birds in the United States.  (10/24)

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Indiana reports more cases of avian flu.  (10/21)

Quebec reports 4th case of avian flu in 2025.  (10/17)

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Avian flu hits two more turkey flock in Minnesota.  (10/10)

Avian flu hits Michigan turkey flock.  (10/9)

Avian flu hits Iowa turkey flock.  (10/7) 

175,000,000 birds have fallen victim to avian flu in United States since 2022.  (10/6)

Migrating season brings a return of avian flu to Iowa.  (10/3)

Jefferson County Wisconsin reports second case of avian flu in less than a week.  (10/3)

September 2025

That Jefferson County Wisconsin farm lost more than 3 million laying hens.  (9/30)

Avian flu claims an historical first death:  Whooping crane.  (9/29)

Wisconsin reports first 2025 commercial case of avian flu in poultry flock without providing any specifics.  (9/29)

Utah in 4th year of avian flu outbreak. (9/27)

Minnesota reports 55,000 cases of avian flu in 3 turkey flocks.  (9/26)

Expect higher prices for your Thanksgiving turkey this year.  (9/26)

South Dakota continues to be hit hard by avian flu.  (9/21)

Minnesota reports avian flu in flock of tom turkeys.  (9/19)

Nebraska reports its first known case of avian flu in dairy herd.  (9/17)

Canadian Food Inspection Agency reports 4 cases of avian flu in Alberta but otherwise remains mum.  (9/17)

South Dakota reports additional cases of avian flu in turkey flocks.  (9/14)

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April-August 2025

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