The United States has reported its first outbreak of H5N9 bird flu in poultry on a duck farm in California, the World Organisation for Animal Health (WOAH) said on Monday.
Both H5N9 and H5N1 were detected at the duck farm in Merced County, according to tests conducted by the US Department of Agriculture (USDA) National Veterinary Services Laboratory. The event began on November 23, with clinical signs that included increased deaths in the ducks.
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Commercial duck flock in California has tested positive for two strains of avian influenza. On November 23, 2024, two HPAI viruses were identified in samples from a farm rearing meat ducks in Merced County in California. Increased mortality was observed at the premises, leading the state veterinary authority to quarantine the farm.
The H5N9 strain of avian influenza is much more rare than the H5N1 which has been responsible for most of the reported human cases and the first human death.
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New cases of HPAI have been identified in the wild bird populations of 13 European countries over past two weeks.
H5N9 is a rare subtype of the influenza A virus that can cause highly pathogenic avian influenza (HPAI), also known as bird flu. It's a reassortment strain that originated from the H5N1, H7N9, and H9N2 subtypes.
The United States has confirmed its first case of highly pathogenic H5N9 avian influenza in poultry, following an outbreak at a duck meat farm in Merced County, California, the World Organization for Animal Health (WOAH) stated Monday.
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This latest outbreak is part of a broader epizootic that has swept across the United States, affecting not only poultry but also wild birds, mammals and humans.