Bird flu was nearly everywhere in the U.S.—in chickens, cows, pet cats and even humans. Cases have gone down, but experts ...

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

The U.S. Centers for Disease Control and Prevention says it has ended its emergency response to H5N1 bird flu, citing a drop in cases.