
Four commercial meat turkey flocks in Ohio and a commercial layer operation in Missouri are the latest confirmed highly pathogenic avian influenza (HPAI) occurrences in the United States.
Avian flu in Ohio
The United States Department of Agriculture (USDA) Animal and Plant Health Inspection Service (APHIS), three of the newly affected flocks in Ohio are in Darke County. Two of those flocks each involved 5,300 turkeys while the other involved 15,800 turkeys.
Another flock in Mercer County was hit by HPAI, but APHIS has not yet released information concerning how many birds were in the flock.
The presence of HPAI in all four flocks was confirmed on January 15.
The number of flocks to be struck by HPAI in Ohio in 2025 has now doubled to eight. Six of those flocks have been in Darke County, while the other two were in Mercer County. Darke County also had HPAI confirmed in another flock on December 27, 2024.
So far in 2025, Ohio has had more flocks hit by HPAI than any other state. Delaware, Michigan and California have each had two flocks affected this year, while Maryland, Missouri, Indiana and North Carolina have each had one.
Avian flu in Missouri
On January 14, HPAI was confirmed in a commercial layer flock in Newton County, Missouri, affecting 1,585,100 hens.
This is the first incidence of HPAI in Newton County during the 2022-24 outbreak. The last time a commercial poultry flock in Missouri was December 27, 2024, with that case being in a commercial turkey breeding hen flock in Cooper County.
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.