In a follow-up on the human infections with novel influenza A viruses found in Ohio, the Centers for Disease Control and Prevention (CDC)  reported three additional cases in the past week.

Image/Scott Bauer, U.S. Department of Agriculture
Image/Scott Bauer, U.S. Department of Agriculture

Three persons, all attendees at the same agricultural fair, were infected with influenza A (H3N2) variant (H3N2v) viruses. All three patients were children younger than 18 years of age who reported direct exposure to swine in a fair setting during the week preceding illness onset. None of the three patients were hospitalized, and all have fully recovered from their illness.

No human-to-human transmission of these viruses has been identified. Public health and agriculture officials are investigating the extent of disease among humans and swine, but no increases in influenza-like illness in the community have been reported.

To date, a total of 15 (Texas [1] and Ohio [14]) human infections with H3N2v viruses and one (Ohio [1]) human infection with H1N2v virus have been identified during 2017.

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When an influenza virus that normally circulates in swine (but not people) is detected in a person, it is called a “variant influenza virus.” For example, if a swine origin influenza A H3N2 virus is detected in a person, that virus will be called an “H3N2 variant” virus or “H3N2v” virus.

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