The latest round of confirmed highly pathogenic avian influenza (HPAI) cases in the United States involved three facilities that raised 1.1 million commercial layers, 10,000 commercial turkey breeder hens and 19,300 commercial meat ducks.

The latest cases were announced on an update on the United States Department of Agriculture (USDA) Animal and Plant Health Inspection Service (APHIS) website.

Avian influenza in Colorado layer flock

The affected layer flock is located in Weld County, Colorado, and that case was confirmed on April 29. This case marks the second case of HPAI in a commercial poultry flock in the state. The previous case, confirmed April 22 in Montrose County, involved a commercial broiler breeder flock.

Avian influenza in Minnesota turkey breeder flock

The affected turkey flock is in Stearns County, and involved 10,000 birds. This case marks the eighth case of HPAI in a commercial flock in the county, all of which involved turkeys. The latest, however, is the first breeder flock in Stearns County to be affected. So far in 2022, there have been 56 cases of HPAI in commercial poultry flocks in Minnesota.

Avian influenza in Pennsylvania duck flock

The affected duck flock is in Lancaster County and involved 19,300 birds. That case was confirmed on April 29. So far in 2022, Pennsylvania has had seven cases of HPAI in commercial poultry flocks, and all seven are in Lancaster County. However, a variety of flocks have been affected in the county, including four commercial layer operations, one commercial broiler operation, one commercial broiler breeder pullet operation, and now a commercial duck operation. A total of 3,845,200 birds in Pennsylvania have been affected by the virus.


Update on Oklahoma case

APHIS also disclosed the size of a previously announced commercial chicken breeder flock in Oklahoma. At the time APHIS first announced the case – the first in a commercial flock in Oklahoma – it did not state the size of the flock, which the agency has now revealed included 13,800 birds. APHIS has now also disclosed that the flock was a commercial broiler breeder flock. The flock is located in Sequoyah County.

New case in Ontario

The Canadian Food Inspection Agency (CFIA) disclosed that a new case has appeared in a commercial poultry flock in Ontario, in the Regional Municipality of York. That marks York’s second case, with the two cases being confirmed on April 21 and April 29. The species involved and the size of the flock have not yet been announced.

To learn more about HPAI cases in North American commercial poultry flocks, see an interactive map on

Read our ongoing coverage of the global avian influenza outbreak.