Move Over, H5N1—Another Bird Flu Strain Has Arrived in the U.S.
The most well-known HPAI subtype circulating today is H5N1. Since early 2024, H5N1 has been causing outbreaks among cows across the country, and it has occasionally jumped into other mammals such as cats and people. But there are always other kinds of HPAI spreading around as well, including H7N9.
Animal health agencies say the variant of highly pathogenic avian influenza was found in a Mississippi broiler breeder flock.
The USDA Animal and Plant Health Inspection Service (APHIS) has previously documented H7N9 low pathogenicity avian influenza (LPAI) in U.S. wild bird surveillance this year and in previous years, but ...
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