How Bird Flu Virus Fragments Get into Milk Sold in Stores, and What the Spread of H5N1 in Cows Means for the Dairy Industry and Milk Drinkers

The discovery of fragments of avian flu virus in milk sold in U.S. stores, including in about 20% of samples in initial testing across the country, suggests that the H5N1 virus may be more widespread in dairy cattle than previously realized.