FRESNO, CALIF. — On Aug. 22, Highly Pathogenic Avian Influenza (HPAI) was detected in a commercial broiler flock in Fresno County, Calif., according to the California Department of Food and Agriculture (CDFA).

Data from the Animal and Plant Health Inspection Service (APHIS) of the US Department of Agriculture found that 33,900 birds were destroyed to prevent the spread of the virus.

“While this virus has impacted commercial flocks in most other states in the US since last January, this is the first commercial flock to be found infected in California,” CDFA said.

The agency also noted that it recently detected HPAI in a backyard flock in Contra Costa County. Infected locations remain under quarantine. 

Earlier this week, Butte County announced a local health emergency after it was confirmed a domestic flock had HPAI.

Several other counties have found HPAI in wild birds. 

The latest numbers from the APHIS on Aug. 24 show 410 commercial and backyard flocks have been discovered with HPAI in 40 states. To date, the virus affected 40.18 million birds.