California health officials reported Tuesday that a child in Alameda Co. has been infected with bird flu; source unknown.

H5 bird flu, a type of avian influenza, has infected dozens of people in the U.S., and spread to seven states and Canada this year. As more human cases arise, there's deepening worry over whether the ...

In 2009, H1N1 bird flu caused the first global flu pandemic in 40 years, with the first infections detected in California.

A child in California has tested positive for bird flu, and is recovering at home with mild upper respiratory tract symptoms, ...

Bird flu has spread far and wide, infecting a range of species like chickens, skunks, cows, foxes and polar bears. But it's ...

A viral respiratory disease is causing a multi-state outbreak in wild birds, poultry and other animals. Bird flu has also lead to more than four dozen infections in people in the U.S. While most human ...

It’s been nearly eight months since avian flu was first detected in U.S. dairy herds, and cases in both cows and humans continue to pile up.

Officials suspect wild migrating birds are likely to blame for the first known infection of a flock in Hawaii, which had been the last state in the country with no reported cases in poultry or wild ...

As a virus scientist in South Africa, I’ve been watching with dread as H5N1 bird flu spreads among animals in the United ...

The H5N1 virus that infected a Canadian teen appears not to have spread, but it shows signs of mutation that makes flu ...

As H5N1 bird flu spreads among California dairy herds and southward-migrating birds, health officials announced Friday six ...

Elephant seal numbers in Argentina remain low after a deadly H5N1 outbreak, highlighting the virus's dangerous adaptability.