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.

The Crescent Duck Farm in Aquebogue, which lost its entire flock of 99,000 to an outbreak of bird flu, has begun the long, methodical process of sanitizing its facilities.

This latest outbreak is part of a broader epizootic that has swept across the United States, affecting not only poultry but also wild birds, mammals and humans.

Lithuania has reported an outbreak of highly pathogenic H5N1 avian influenza, commonly called bird flu, on a laying hen farm in the western part of the country, the World Organisation for Animal Health (WOAH) said on Wednesday.

What is H5N9 and how is it different from H5N1? Scientists classify bird flu viruses by which kind of two key proteins are inside of them: the hemagglutinin, like H5 or H3, and th

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

H5N9 and H5N1 are two strains of bird flu that have recently sparked concern, especially after a significant outbreak at a California duck farm. Both strains are highly pathogenic, affecting poultry and wild birds,