Health officials are making a renewed call for vigilance against bird flu, but some experts are puzzling over why reports of ...

By Debora Ely and Ana Mano MONTENEGRO, Brazil (Reuters) -Brazilian authorities hope to determine by Tuesday whether a ...

During a call with U.S. doctors this month, one CDC official noted that there is a seasonality to bird flu: Cases peak in the ...

Brazil, the world's largest chicken exporter, on Friday reported its first case of highly pathogenic avian influenza - also ...