Swine flu: H3N2v case reported in Michigan


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The Centers for Disease Control and Prevention, through the Michigan Department of Health and Human Services, reports a human infection with influenza A virus (influenza A (H3N2) variant (A (H3N2) v)).

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The patient is less than 18 years old and has not been admitted to the hospital and recovered from his illness. An investigation by local public health officials found that the patient was indirectly exposed to pigs at an agricultural fair prior to the onset of his disease.

A total of nine human infections with the influenza A variant viruses were reported in the United States in 2022, including four H3N2v (Michigan (1) and West Virginia (3)) and five H1N2v (Georgia, Michigan, Ohio, Oregon, and Wisconsin) viruses.

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In the United States, there are three previously discovered types of type A swine influenza viruses that can cause disease in humans: H1N1v, H3N2v, and H1N2v. Pigs infected with any of these types of swine flu may show signs of illness such as fever, depression, cough (barking), discharge from the nose or eyes, sneezing, difficulty breathing, eye redness or inflammation, and passing food. Not all pigs with influenza show signs of illness or may be only mildly ill. Swine flu can spread 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.

In rare cases, humans who have been in direct contact with infected pigs may develop flu-like symptoms, such as fever, lethargy, lack of appetite, and cough. People have also reported signs of illness including a runny nose, sore throat, eye irritation, nausea, vomiting, and diarrhea.

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