The first U.S. H5N9 outbreak has raised concerns as scientists warn of evolving bird flu risks—here's what you need to know about the symptoms.

A new strain of a highly pathogenic and rare strain of bird flu has been reported on a duck farm in central California.

H5N9 is a rare subtype of the influenza A virus that can cause highly pathogenic avian influenza (HPAI), also known as bird ...

A pandemic is not inevitable, scientists say. But the outbreak has passed worrisome milestones in recent weeks, including ...

The team found that animals that had the virus inoculated directly into their lungs became severely ill, whereas animals that ...