A different strain of H5N9 has shown up in U.S. birds before.

The United States has reported its first outbreak of H5N9 bird flu on a duck farm in California, according to the World Organization for Animal Health (WOAH) on Monday. H5N9 is a rare subtype of the ...

As the highly pathogenic avian influenza outbreak continues, university experts work to develop edible vaccines to protect ...

A new nasal spray vaccine could stop bird flu at the door — blocking infection, reducing spread, and helping head off the next pandemic.

Prior seasonal influenza virus immunity did not impair antibody responses or protection conferred by the intranasal H5N1 vaccine.

Kentucky Department of Agriculture officials have quarantined and euthanized a backyard poultry flock in Jessamine County after a bird tested positive for highly pathogenic avian influenza. Commonly ...

A total of 32 birds have been found dead at Lake Eola in downtown Orlando: 26 Mute swans and 6 wild birds. Avian influenza, also known as avian flu or bird flu, is suspected in most of the deaths as ...

A sick snow goose in Kent County, Delaware, has tested presumptive positive for avian influenza. This marks the second known case of bird flu in Delaware this season, following a November incident in ...