The Centers for Disease Control and Prevention (CDC) reported on two human infections with novel influenza A viruses in Iowa in their latest FluView publication.
The two cases–one influenza A(H3N2) variant (A(H3N2)v) and one influenza A(H1N2) variant (A(H1N2v))–are both in people less than 18 years of age.
Neither of the individuals were hospitalized and both have fully recovered from illness. Investigation into the sources of infections showed that household members of one individual kept or cared for swine and the other individual had direct contact with swine. No human-to-human transmission has been identified associated with either case.
Nine human infections with a novel influenza A virus have been reported in the United States this influenza season, including two H3N2v (IA, WI), two H1N2v (IA, OH), and five H1N1v (IA, NC, WI (3)) virus infections. Five infections have occurred in children <18 years of age and four have occurred in adults ≥ 18 years of age.
Swine flu viruses do not normally infect humans. However, sporadic human infections with influenza viruses that normally circulate in swine and not people have occurred.
Most commonly, human infections with variant viruses occur in people with exposure to infected pigs (e.g., children near pigs at a fair or workers in the swine industry).
Illness associated with variant virus infection has been mostly mild with symptoms similar to those of seasonal flu.
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