The Centers for Disease Control and Prevention (CDC) reported today on a human infection with influenza A(H1N2) variant (A(H1N2)v) virus.
The case is in a patient < 18 years of age. An investigation by local public health officials is ongoing.
A total of seven human infections with variant novel influenza A viruses have been reported in the United States in 2022, including three H3N2v (West Virginia) and four H1N2v (Michigan, Ohio, Oregon, Wisconsin) viruses. 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. Early identification and investigation of human infections with novel influenza A viruses are critical so that the risk of infection can be understood, and appropriate public health measures can be taken.
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