News Animals

As bird flu evolves, keeping it out of farm flocks is getting harder

New versions of the H5N1 virus are increasingly adept at spreading

Wild birds fly by a poultry farm in Illinois

Wild birds, especially ducks and geese, like these flying by a farm in Illinois, can spread H5N1 bird flu to poultry. Keeping the wild and domestic birds separate is a challenge.

John Ruberry/Getty Images

By Tina Hesman Saey

H5N1 bird flu isn’t going away.