A new strain of H5N9 bird flu was detected at a commercial duck operation in California's Merced County. All the ducks were euthanized.

Ducks can often still fly, eat and mingle with other birds, spreading these new viruses to other animals. Waterfowl also congregate in large, mixed flocks that can worsen disease spread, Igleski said.

The California duck farm's strain of H5N9 is different from those earlier cases because this time it is closely related to a newer variant of the H5N1 virus. That variant is called H5N1 D1.1, the USDA ...

The newly reported H5N9 strain was found Monday at a duck farm in Merced County, California, according to the World ...

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