The Centers for Disease Control and Prevention , via the Michigan Department of Health and Human Services reports a human infection with a novel influenza A virus (influenza A(H3N2) variant (A(H3N2)v) virus).
The patient is <18 years of age, was not hospitalized, and has recovered from their illness. An investigation by local public health officials found that the patient had indirect swine exposure at an agricultural fair prior to their illness onset.
A total of nine human infections with variant novel influenza A viruses have been reported in the United States in 2022, including four H3N2v (Michigan (1) West Virginia (3)) and five H1N2v (Georgia, Michigan, Ohio, Oregon, Wisconsin) viruses.
In the United States, there are three previously detected variants of swine influenza type A viruses that can cause disease in humans: H1N1v, H3N2v, and H1N2v. Pigs that are infected with any of these types of swine flu may exhibit signs of illness such as fever, depression, coughing (barking), discharge from the nose or eyes, sneezing, breathing difficulties, eye redness or inflammation, and going off feed. Not all influenza-infected pigs will show signs of illness or may only be mildly ill. Swine flu can circulate at any time of the year, but like the normal flu season for human influenza viruses, most outbreaks occur in the late fall and winter months.
In rare cases, humans that have come into direct contact with infected pigs might develop flu-like symptoms, such as fever, lethargy, lack of appetite and coughing. People have also reported signs of illness including runny nose, sore throat, eye irritation, nausea, vomiting, and diarrhea.
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