The highly pathogenic avian influenza H5N1 virus spilled from birds to US dairy cows, potentially moving to a Colorado poultry farm, causing human infections.
Confirmed cases of avian influenza infected five workers with mild illnesses, varying symptoms from conjunctivitis to typical flu-like symptoms but no hospitalizations.
The virus infecting the workers closely resembles the one in infected chickens, related to the dairy outbreak, with a dairy to poultry farm transmission hypothesis.
Colorado poultry farm outbreak doubled human avian influenza cases, highlighting a link between dairy cows and poultry farms for potential spread and human infections.
CDC notes the dairy to poultry farm link as a hypothesis, emphasizing the need for further investigation into the documented human infections from the virus spread.
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