Headline: WATT Poultry, 3/18/2025
Roy Graber reports:
The H7N9 strain of highly pathogenic avian influenza (HPAI) has appeared in a commercial poultry flock in the United States for the first time since 2017.
The Mississippi Board of Animal Health (MBAH) reported that the presence of the H7N9 variant was confirmed in a commercial broiler breeder flock in Noxubee County, Mississippi. The flock involved 47,653 chickens, according to the World Organisation for Animal Health (WOAH).
MBAH on March 12 reported that birds in the flock had tested positive for HPAI, but it did not report the serotype involved. The United States Department of Agriculture (USDA) Animal and Plant Health Inspection Service (APHIS) confirmed the presence of HPAI in the flock on that same day, and this week updated its website to reflect that.
According to MBAH, APHIS earlier this year had documented instances of an H7N9 strain of low pathogenic avian influenza in wild birds, but this is the first time a highly pathogenic form of H7N9 has been confirmed in eight years. The state agency also stated this strain is unrelated to the Eurasian H5N1 clade of HPAI that has been present throughout the 2022-25 North American HPAI outbreak.
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