A California duck farm reported H5N9 bird flu detection, noted as the first instance in U.S. poultry with severe illness. The USDA confirmed heightened mortality in the flock, urging quarantine. While H5N9 has been previously identified in birds, it has not been linked to serious outbreaks in American poultry until now. Both H5N9 and H5N1 were present in the affected ducks, signaling potential genetic reassortment between different influenza strains, raising concerns among health experts about the evolving threat to both animals and humans.
Clinically, the USDA confirmed that H5N9 had resulted in increased mortality in the affected flock, prompting state officials to quarantine the premises.
The emergence of H5N9 is significant as it marks the first detection of this strain in American poultry exhibiting severe disease due to avian influenza.
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