CDC confirms another human infection with flu virus from pigs
The virus subtype is different from the previous three infections
22 August 2022
2 minute read
By: 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% 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
