Highly pathogenic avian influenza (HPAI) H7N9 of North American wild bird lineage was detected in a commercial broiler breeder chicken flock in Mississippi. Depopulation of the affected flock is in progress. The USDA Animal and Plant Health Inspection Service (APHIS), in conjunction with State Animal Health and Wildlife Officials, are conducting a comprehensive epidemiological investigation and enhanced surveillance in response to the detection.
A commercial broiler breeder premises {in Mississippi}. Clinical signs included increased mortality. Depopulation was completed 13 Mar 2025.
Source: WOAH, https://wahis.woah.org/#/in-review/6340
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