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.

U.S. dairy cattle tested positive for a strain of bird flu that previously had not been seen in cows, the U.S. Department of Agriculture said on Wednesday, ramping up concerns about the persistent spread of the virus.

Herds of cattle in Nevada tested positive for the strain of H5N1 bird flu never before seen in cows, state agriculture officials confirmed. CBS News' Andres Gutierrez reports on the lethal strain that led to a man's death in Louisiana in 2024.

The risk of bird flu to humans is low, but eating undercooked eggs or chicken could increase your chances of exposure to infection and germs.

Authorities in New York state have temporarily closed all live poultry markets in New York City and three suburban counties after detecting bird flu at seven markets within the past week, according to a notice on Friday.