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 ...

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 fall and early winter, possibly due to the migration patterns of wild ...

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 fall and early winter, possibly due to the migration patterns of wild ...

(Cynthia Goldsmith, Jackie Katz/CDC via AP) The H5N1 bird flu has been spreading widely among wild birds, poultry and other animals around the world for several years, and starting early last year ...