Second bird flu strain found in US dairy cattle, agriculture agency says

FILE - Cows are seen at a dairy in California, Nov. 23, 2016. Genome sequencing of milk from Nevada has identified a different strain of bird flu in dairy cows for the first time, the USDA said Feb. 5, 2025.

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 on Wednesday, ramping up concerns about the persistent spread of the virus.