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WI: Novel Influenza A Virus

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  • WI: Novel Influenza A Virus

    Source: https://www.cdc.gov/flu/weekly/index.htm


    Novel Influenza A Virus

    Two human infections with a novel influenza A virus were reported by Wisconsin. Both individuals were infected with influenza A(H1N2) variant (A(H1N2)v) virus. Both patients were ≥18 years of age. One patient was hospitalized, and both have completely recovered from their illness. Investigation into the source of the infections revealed that prior to illness onset both patients attended the same county fair where swine were being exhibited. No human-to-human transmission of (A(H1N2)v) virus associated with either patient has been identified.
    When an influenza virus that normally circulates in swine (but not people) is detected in a person, it is called a “variant influenza virus”. Seven human infections with a novel influenza A virus have been reported in the United States this influenza season, including one H3N2v (WI), three H1N2v (OH, WI (2)), and three H1N1v (IA, NC, WI) virus infections. Three infections have occurred in children <18 years of age and four have occurred in adults ≥ 18 years of age. All cases either had direct contact with swine or were on a property with swine present prior to illness onset.
    Early identification and investigation of human infections with novel influenza A viruses are critical so that the risk of infection can be more fully understood and appropriate public health measures can be taken. Additional information on influenza in swine, variant influenza virus infection in humans, and strategies to interact safely with swine can be found at www.cdc.gov/flu/swineflu/index.htm. Additional information regarding human infections with novel influenza A viruses can be found at https://gis.cdc.gov/grasp/fluview/Novel_Influenza.html.
    Additional information about medically attended visits for ILI for current and past seasons:
    Surveillance Methods | FluView Interactive: National, Regional, and State Data or ILI Activity Map


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