Symptoms seen in humans infected by D1.1 have been more severe than the previous bird flu strain that has been spreading in cows. That strain, called B3.13, has led to only mild symptoms ...

H5N1 bird flu is branching out. New data from the Centers for Disease Control and Prevention indicates that a second type of ...

The strain of bird flu is distinct from what has previously been found in dairy cattle. The finding raises some worrying ...