Taiwan reports 3rd human infection with swine influenza A(H1N2) variant virus


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On Thursday, the Taiwan Centers for Disease Control and Prevention announced a new human case of swine influenza A (H1N2) virus. Testing and genetic sequencing by the agency show that it is similar in genotype to First case of H1N2v infection in Taiwan in 2021.

Image / Mutinka

The Centers for Disease Control and Prevention indicated that this case is the third case of H1N2v influenza virus in Taiwan. This case has no history of recent travel abroad, and has a history of contact with pigs after an epidemic investigation. The patient experienced symptoms such as fever, nasal congestion, and muscle pain. He went to the clinic the next day for medical treatment, and the rapid influenza test was positive for type A. The doctor did a test, prescribed an antiviral medicine for the flu, and went home. He has recovered from the disease.

Three contacts of the case were investigated, all of whom had no flu-like symptoms, and no H1N2v influenza virus infection was found after testing. Officials call this case a sporadic case.

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The Department of Disease Control and Prevention stated that the first and second cases of H1N2v influenza virus were detected in Taiwan in April 2021 and October 2022. All of them were engaged in raising livestock, but the first two cases and this case do not live in the same province and city, the location of the farm, the source of fodder, pigs, and the route of the carriage in the three cases are all different, so the three cases were judged to be unrelated.

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H1N2v is a low-virulence influenza virus found in pigs, and there have been occasional cases of human infection, most of which are mild. Since 2011, there have been at least 47 confirmed cases of H1N2v influenza in the world, with 41 cases in the Americas. Some cases have a history of contact with pigs or exposure to polluted environments, and there is no case of infection through eating meat. The genetic sequence of the virus isolated from the patient this time is similar to the H1N2 virus strain isolated from pigs in the past, but not the same. He is sensitive to current publicly funded influenza drugs.

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