Bird flu is getting worse — but it's not yet "cow flu," experts explain yahoo.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from yahoo.com Daily Mail and Mail on Sunday newspapers.
Four years after a mysterious respiratory virus jumped from animals into humans and launched the COVID pandemic, wary epidemiologists are keeping a close eye on a strain of avian influenza that is spreading among U.S. dairy cows