The Taiwan Centers for Disease Control and Prevention announced Thursday a new case of human infection with swine influenza A(H1N2) variant virus. Testing and gene sequencing by the agency shows it is similar to the genetic composition of the first case of H1N2v infection in Taiwan in 2021.
The Centers for Disease Control and Prevention pointed out that this case is the third case of H1N2v influenza virus in Taiwan. The case has no recent travel history abroad, and has a history of contact with pigs after the 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 took a test and prescribed influenza antiviral medicine and returned home. He has recovered from the illness.
Three close 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 a sporadic case.
The Department of Disease Control and Prevention stated that the first and second cases of H1N2v influenza virus in Taiwan were detected in April 2021 and October 2022. All were engaged in livestock breeding, but the first two cases and this case do not live in the same county and city, and the location of the farm, the source of feed and pigs, and the path of the transport vehicle in the three cases are all different, so the three cases are judged to be unrelated.
H1N2v is a low-pathogenic influenza virus that exists in pigs, and there are occasional cases of human infection reported, and most of them 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 contaminated environments, and there is no case of infection through eating meat. The gene 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. It is sensitive to the current public-funded influenza antiviral drugs.