A person in Missouri is the United States’ first case of H5 avian influenza without a known exposure to a sick animal, the US Centers for Disease Control and Prevention said on Friday.
“This is the 14th human case of H5 reported in the United States during 2024 and the first case of H5 without a known occupational exposure to sick or infected animals,” the CDC said in a statement. It’s also the first H5 case detected through the country’s national flu surveillance system rather than targeted surveillance of the ongoing bird flu outbreak in animals.
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The case is under investigation by the Missouri Department of Health and Senior Services. The person had underlying medical conditions and was hospitalized on August 22. The person tested positive for influenza A, was treated with influenza antiviral medications and is now recovered and at home, according to MDHSS.
There are no cases of bird flu among cattle in Missouri, but there have been outbreaks of the virus among poultry in the state.
The CDC’s risk assessment of H5N1 for the general public remains low, the agency said.