More avian influenza confirmed in Dallas County, Missouri

A commercial layer operation of 20,300 chickens is the county’s fourth flock to be struck by avian flu in 2024.

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Highly pathogenic avian influenza (HPAI) has appeared in a commercial table egg layer flock in the same Missouri county where three commercial turkey flocks had just been affected by the virus.

The United States Department of Agriculture (USDA) Animal and Plant Health Inspection Service (APHIS) reported that a flock of 20,300 layers in Dallas County, Missouri, had been infected with HPAI. That case was confirmed on February 23, just two days after the presence of HPAI was confirmed in three flocks in Dallas County.

Those three turkey flocks involved 12,300, 28,500 and 31,000 birds.

Those four flocks in Dallas County are the only commercial poultry flocks in Missouri to be affected by HPAI in 2024.

During 2023, Missouri lost two flocks and 45,900 head of commercial poultry to the virus, with the last instance being confirmed on November 12, 2023, in Jasper County.

In 2022, the state lost eight flocks and 469,300 birds as a result of HPAI infections. However, prior to now, Dallas County had not had any HPAI infections during the 2022-24 avian influenza outbreak.

So far in 2024, nine states have had HPAI infections in commercial poultry and/or commercial gamebird operations. Kansas has had the most with five, while California has had four, and with these three turkey flocks involved, Missouri has had three. North Carolina and South Dakota have both had two flocks affected, while Colorado, Nebraska, Indiana and Wisconsin have each had one.

In Canada, three provinces have had commercial poultry flocks affected by HPAI. Quebec has had two flock infections, while Ontario and Alberta have each had one.

To learn more about HPAI cases in commercial poultry flocks in the United States, Mexico and Canada, see an interactive map on   

View our continuing coverage of the global avian influenza situation

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