Infection Control and Prevention

Influenza viruses: Type A, B and C. Most common cause of annual outbreaks and epidemics are Type A and B. Influenza A virus subtypes reported in severe epidemics includes avian H5N1, H7, and swine H1N1 and H3N2 viruses. 1.6.3 Occurrence . Annual outbreaks of influenza occur most commonly during autumn and winter months. ................
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