Influenza A pandemics of the 20th centur
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J. S. Oxford
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Article
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2000
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John Wiley and Sons
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English
⚖ 162 KB
In¯uenza A virus initiated worldwide epidemics (pandemics) in 1918, 1957, 1968 and 1977. A revised calculation of the 1918±1919 pandemic estimates that 40 million persons died and 500 million were infected. The mortalities in 1957 and 1968 were nearly 6 million. Biological and genetic characteristic