While the H5N1 bird flu keep spreading, the first reported H5N9 outbreak in the United States has been identified on a duck farm in California.

H5N9 is a rare subtype of the influenza A virus that can cause highly pathogenic avian influenza (HPAI), also known as bird flu. It's a reassortment strain that originated from the H5N1, H7N9, and H9N2 subtypes.

Avian influenza, commonly known as bird flu, refers to several types of influenza that typically infect birds. But certain variants, such as H5N1, have raised alarm among health ... virus, including the first reported human death from bird flu in Louisiana ...

Detected on a duck farm in Merced County, California, it’s the first confirmed case of H5N9 in poultry in the US. Read more at straitstimes.com.

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

The CDC announced on Thursday its recommendation to test hospitalized influenza A patients more quickly and thoroughly to distinguish between seasonal flu and bird flu.

Is it seasonal flu or bird flu? CDC prompts hospitals to fast-track subtype testing of sick patients to tell the difference.

US officials are investigating the appearance of a strain of bird flu identified in the US for the first time, a worrying sign that the virus is evolving in ways that could make it harder to