1918 Pandemic (H1N1 virus)

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The impact of this pandemic was not limited to 1918–1919. All influenza A pandemics since that time, and indeed almost all cases of influenza A worldwide (excepting human infections from avian viruses such as H5N1 and H7N7), have been caused by descendants of the 1918 virus, including “drifted” H1N1 viruses and reassorted H2N2 and H3N2 viruses.

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