There may be more bird flu ... with H5N1-infected cattle. All of the samples were obtained between 15 and 19 days after cows on the farms had tested positive for the virus. Nirav Shah at the CDC and his colleagues then removed seasonal influenza antibodies ...

Seven percent of tested workers on dairy farms where cows were infected with bird flu caught the virus themselves, according to a new study.

About 7% of dairy workers exposed to the avian flu that is spreading through U.S. herds have become infected themselves, federal experts estimate. That number highlights concerns that circulating strains of bird flu might become highly infectious in humans,

The CDC said Thursday it is updating its recommendations for testing, treatment and protection for workers who may be exposed animals infected with bird flu.