Studies suggest that people who had seasonal flus or vaccinations have low antibody levels against H5N1 bird flu.

Bird flu was nearly everywhere in the U.S.—in chickens, cows, pet cats and even humans. Cases have gone down, but experts warn that it hasn’t disappeared ...

Bird flu has been confirmed at a farm in Devon, the Department for Environment, Food and Rural Affairs (Defra) has said.

Scientists have known for more than a year that bird flu, H5N1, made the jump from wild birds and common poultry to cows and ...

New versions of the H5N1 virus are increasingly adept at spreading. Suggestions to either let it rip in poultry or vaccinate the birds could backfire.

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