On Aug. 5, 2022, the Centers for Disease Control and Prevention (CDC) has reported the first human infection with an influenza (flu) virus that usually spreads in pigs occurring during 2022. The person had direct contact with pigs at an agricultural fair, where pigs tested positive for flu A. Recent reports of an increase in swine flu outbreaks in pigs in the U.S. suggest the risk of exposure and infection with these viruses may be higher than usual this fair season, which can last into the fall. CDC recommends people take precautions around swine, including in the fair setting.

Every year, there are rare sporadic human infections with flu viruses that usually spread in pigs. When found in people, these are called “variant flu virus” infections and designated with the letter “v” after the subtype. Variant flu virus infections are usually associated with contact with pigs, often at agricultural fairs. 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.

The first variant flu virus infection of 2022 was reported by West Virginia and occurred in a person younger than 18 years who participated in an agricultural fair and had contact with pigs.