Three new cases of highly pathogenic avian influenza (HPAI) have been confirmed in commercial turkey flocks in three South Dakota counties, while another case has been confirmed in a commercial pullet flock in Maryland.

Avian influenza in South Dakota

According to the United States Department of Agriculture (USDA) Animal and Plant Health Inspection Service (APHIS), HPAI was confirmed in the South Dakota Counties of Hutchinson, Kingsbury and Hanson, affecting 49,000, 39,000 and 20,233 turkeys, respectively.

These three cases follow two earlier HPAI cases in commercial poultry operations in South Dakota in 2022. The first was a mixed flock of 47,330 birds. APHIS did not elaborate on what species were in that flock, but the World Organisation for Animal Health (OIE) revealed that there were turkeys in the flock. The other case was a commercial flock of 36,000 turkeys. Both of those previous cases were confirmed in Charles Mix County.

Avian influenza in Maryland

The most recent case of HPAI in Delaware involves a commercial pullet flock of 315,000 birds in Cecil County.

Two prior cases of HPAI were also confirmed in Cecil County. Those included a commercial layer flock that included 664,061 chickens and a commercial layer flock that included 496,272 chickens.


Also in Maryland, there was a confirmed case of HPAI in Queen Anne’s County, which involved a flock of 150,000 broiler chickens. In addition, the Delmarva Peninsula, where all of Maryland’s confirmed cases have been, has been struck with three cases of HPAI in Delaware. One of those was in Kent County, while the other two were in New Castle County.

In addition to South Dakota, Maryland and Delaware, HPAI has also been confirmed in Indiana, Kentucky, Missouri, Wisconsin and Iowa.

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.