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The Michigan Department of Health and Human Services reported two human infections with novel influenza A viruses in July.
One patient, a Lapeer County resident who was an exhibitor at the Oakland County Fair, was infected with an influenza A(H3) variant (A(H3)v) virus, and the other patient, a Tuscola County resident who attended the Tuscola County Fair, was infected with an influenza A(H1N2)v virus.
Both patients are <18 years of age, were not hospitalized, received oseltamivir, and have recovered or are recovering from their illness. No person-to-person transmission of variant influenza A viruses associated with either patient has been identified. The investigations are ongoing.
These are the first variant influenza A viruses reported in the United States in 2023.
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When an influenza virus that normally circulates in swine (but not people) is detected in a person, it is called a “variant” influenza virus. Most human infections with variant influenza viruses occur following exposure to swine, but human-to-human transmission can occur. It is important to note that in most cases, variant influenza viruses have not shown the ability to spread easily and sustainably from person to person.
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