Avian flu strikes California egg layers, duck breeders

California’s most recent cases of avian influenza were confirmed in Sonoma and San Benito counties.

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New cases of highly pathogenic avian influenza (HPAI) were confirmed in commercial poultry operations in California, affecting both the egg and duck sectors.

According to the United States Department of Agriculture (USDA) Animal and Plant Health Inspection Service (APHIS) the presence of the virus was confirmed in a flock of 82,500 commercial table egg layers in Sonoma County on November 30.

That same day, HPAI was confirmed in a commercial duck breeder flock in San Benito County. There were 5,000 ducks in that flock.

On November 27, another commercial duck breeding operation in California was struck by HPAI. This flock was located in Sonoma County and involved 169,300 birds.

So far in 2023, California has had six commercial poultry farms affected by HPAI. Four of those involved ducks, one involved laying hens and the other involved turkeys. In 2023, the state had 15 commercial flocks get hit by HPAI.

One more Minnesota turkey flock affected

APHIS reported another confirmed case of HPAI in a commercial turkey flock in Minnesota.

The most recent case for the agency to report was in Douglas County, with 13,500 commercial meat turkeys affected.

Minnesota remains the state to have the most commercial poultry farms affected by HPAI during the 2022-23 outbreak.

More details on Arkansas infection

APHIS earlier reported that HPAI had been confirmed in a commercial broiler flock in Carroll County, Arkansas, on November 29, but did not report information concerning the size of the affected flock. APHIS has since updated the information on its website, revealing that 81,200 birds were involved.

This is the second commercial poultry operation in Arkansas to be hit by HPAI in 2022, and the third of the 2022-23 outbreak.

View our continuing coverage of the global avian influenza situation

To learn more about HPAI cases in commercial poultry flocks in the United States, Mexico and Canada, see an interactive map on WATTPoultry.com. 

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