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.

Bird flu has had a nationwide effect causing harm to the poultry and domestic animals but it also has been posing a risk to human health. While the health risk is low, people have been cautioned.