The newly reported H5N9 strain was found Monday at a duck farm in Merced County, California, according to the World Organization for Animal Health. The Paris-based organization that studies animal diseases said it's the first verified U.S. case of H5N9 in poultry. The organization said the more common strain H5N1 was also found.

In today’s Health Alert, a new strain of bird flu - H5N9 - has been detected in the U.S. The first confirmed case was found at a commercial 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.

The nationwide spread of highly pathogenic avian influenza, HPAI, also known as avian or bird flu, has many in Illinois concerned about livestock,

Most of the UK has been placed under an avian influenza prevention zone after cases show no sign of stopping. The new zone to tackle a rising number of bird flu cases was declared in England and Scotland after the spread among poultry has escalated.

A new strain of bird flu has been confirmed at a duck farm in California, the first time the variant has been discovered in poultry in the United States, an international agency said.