The H5N1 avian flu is circulating in cows and other mammals. Whether it will make a permanent leap to humans is another ...

Avian influenza, or bird flu, is highly infectious in birds and usually fatal. While it doesn't spread to humans nearly as much, it has a high fatality rate.

Bird flu vaccine for humans. The U.S. Government is developing vaccines against avian influenza A(H5N1) viruses, according the CDC.The CDC has developed H5 candidate vaccine viruses that has been ...