Influenza H3N2 — United States
Four human infections with influenza viruses that normally circulate in swine (swine influenza) were reported by CDC this week. When swine influenza viruses are detected in people, they are called “variant” viruses and are designated with a letter v at the end of the virus subtype. The 4 human infections were caused by H3N2v viruses in Ohio (2) and Michigan (2). All 4 patients reported attending fairs where they had exposure to pigs during the week preceding illness onset. Pigs at the fairs
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