The presence of highly pathogenic avian influenza (HPAI) was confirmed in four U.S. commercial poultry flocks on November 12.
Three of those flocks are in California, while the other is in Utah.
According to information from the United States Department of Agriculture (USDA) Animal and Plant Health Inspection Service (APHIS), the largest of those affected flocks was a commercial table egg layer operation in Kern County, which had 2,155,100 birds involved.
The other two California flocks are in Fresno County. One of those was a commercial broiler flock of 237,700 chickens and a flock of 34,800 commercial turkey breeder replacement toms.
The Utah flock, located in Piute County, involved 37,500 commercial meat turkeys.
To date in 2024, California has 15 commercial poultry flocks affected by H5N1 HPAI, three of which have been in Fresno County. This is the first case of HPAI in Kern County during the 2022-24 outbreak.
Utah has had two flocks affected by HPAI in 2024, with the other one being a commercial laying hen operation in Cache County, where the presence of the virus was confirmed on October 15.
Both states have also been struggling with cases of H5N1 in commercial dairy operations, with the situation in California being the most severe. During the past 30 days, California has had 173 cases, while Utah has had 13, according to APHIS.
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.
