1918 Pandemic (H1N1 virus)

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H1N1 viruses descended from the 1918 strain, as well as H3N2 viruses, have now been cocirculating worldwide for 29 years and show little evidence of imminent extinction.By the early 1990s, 75 years of research had failed to answer a most basic question about the 1918 pandemic: why was it so fatal?

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