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CDC Confirms Another Human Infection with Flu Virus from Pigs in Oregon (H1N2v)

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  • CDC Confirms Another Human Infection with Flu Virus from Pigs in Oregon (H1N2v)


    CDC Confirms Another Human Infection with Flu Virus from Pigs

    August 19, 2022—CDC has reported another human infection with an influenza (flu) virus that usually spreads only in pigs, bringing the total number of such infections in the United States during 2022 to four. This new infection was caused by a different flu virus subtype (H1N2v) than the three previously reported infections (H3N2v) during 2022. Sporadic human infections with flu viruses that usually spread in pigs happen every year, often in the agricultural fair setting where pigs are present; however, not all variant virus infections have been in people with known pig exposure. This H1N2v infection occurred in a person who reported no contact with pigs or attendance at an agricultural fair. A public health investigation did not find any illness among household contacts and about 10 percent of reported variant flu virus infections in the United States since 2010 have been in people who did not have any documented swine contact. No person-to-person spread with this H1N2v virus has been confirmed.

    An investigation into this situation has found that:
    • The infection occurred in a person younger than 18 years in Oregon.
    • The patient was not hospitalized and has recovered from their illness.
    • The infected person did not report having contact with pigs or attending an agricultural fair within 10 days of illness onset. An investigation of the patient’s household contacts did not find any additional illnesses.
    • No person-to-person spread of H1N2v virus associated with this person has been confirmed.
    • This is the first H1N2v virus infection reported in the United States during 2022.

    When flu viruses that usually spread in pigs (called swine-origin flu viruses) are found in people, they are called “variant flu virus” infections and designated with the letter “v” after the subtype. While these types of infections usually cause mild illness, they are concerning because they can cause severe illness, especially in people at higher risk of serious flu complications, and because of their potential to cause a flu pandemic should they obtain the ability to spread easily from person to person in a sustained way.

    In general, the risk of infection to the public from these infections is considered low, but each case of human infection with a variant flu virus should be fully investigated to be sure that such viruses are not spreading in an efficient and ongoing way in people, and to limit further exposure of people to infected animals if infected animals are identified. CDC is monitoring this situation closely and will make adjustments to the public health risk assessment and recommendations as circumstances warrant. CDC reports these cases in FluView. CDC will conduct additional laboratory tests on this variant flu virus, including analysis to determine whether flu vaccines stockpiled in case of a future flu pandemic would protect against infection and severe illness with this virus...