U.S. dairy cattle tested positive for a strain of bird flu that previously had not been seen in cows, the U.S. Department of Agriculture said.

The genetic sequencing of the bird flu virus (highly pathogenic avian influenza) detected in a Dodge County dairy herd earlier this month indicates it was likely a new spillover event from wildlife.

Bird flu was detected in a dairy herd in Dodge County, the first such case documented among dairy cattle in Wisconsin. The state Department of Agriculture, Trade and Consumer Protection identified a ...

The H5N1 avian influenza virus—commonly known as bird flu—has been causing outbreaks in dairy cows in the United States since March 2024. Now, scientists studying the adaptation of the avian H5N1 ...