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Influenza Pandemics of the 20th Century - PowerPoint PPT Presentation


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Influenza: Epidemics and Pandemics. Influenza is an annual cause of significant morbidity and mortality: epidemics recognized in temperate areas for many yearsUnpredictably and at irregular intervals, pandemics associated with increased mortality occurAttack rates approach 40-50% in some populationsCriteria for a pandemic influenza virus:novel influenza A strain little or no immunity in populationperson-to-person transmission with disease.

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