Bird flu continues to spread across the U.S., with new infections in Hawaii and continued human outbreaks in California.

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

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

A teenager diagnosed with bird flu in British Columbia is the first domestically acquired human case of H5N1 avian influenza, ...

British Columbia health officials have yet to identify a likely source of the infection, though none of the teen's contacts ...

Canadian health officials have confirmed bird flu in a British Columbia teen. The Public Health Agency of Canada said ...

A teenager in British Columbia was hospitalized in critical condition with the disease, and officials were working to find ...

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

The highly pathogenic avian influenza that put a British Columbia teenager in critical condition appears to be the same ...

A child in California has tested positive for bird flu, despite having no known contact with infected animals, stat ...

In an indication that the bird flu outbreak is "headed in the wrong direction," sequencing of the virus that has stricken a ...

Dozens of cases have been reported in the U.S. this year. Experts discuss the symptoms and how to prevent getting sick.