Seasonal influences on pertussis.

Abstract

Both the absolute levels and the seasonal pattern of pertussis have changed over the past four decades in England and Wales. Three-to-four-year period epidemics tended to peak in the early or middle part of the year prior to 1957, during the last quarter between 1958 and 1975, and have been bimodal, with peaks in February and September, in both epidemics… (More)

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