Cows have human flu receptors, study shows, raising stakes on bird flu outbreak in dairy cattle CNNBird flu outbreak in cows is latest avian flu curveball - STAT STATFDA Chief on H5N1: 'We Have to Be Ready' Medpage TodayHow Bird Flu Caught the Dairy Industry Off Guard Scientific AmericanOpinion | If H5N1 spreads among farmworkers, it could lead to a pandemic The Washington Post