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    Hosp Pract. 1976 Oct;11(10):49-56.

    The epidemiology of influenza.

    Abstract

    Although unpredictable, influenza outbreaks are known to occur in three patterns: pandemics every 30 to 40 years, with high excess mortality; epidemics much more frequently, with lower excess mortality; and usually mild sporadic outbreaks. The possibility of a swine-flu pandemic this winter, resembling that of 1918-20, is the result of a unique deviation in the epidemiology of this fascinating disease.

    PMID:
    67988
    [PubMed - indexed for MEDLINE]

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