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Seasonal variation in the incidence of invasive pneumococcal infections is a well-known phenomenon, but the effects of short-term weather changes on the epidemiology of such infections have received little attention. To investigate such effects, researchers correlated meteorologic data from North Jutland County, Denmark, with incidence rates of pneumococcal bacteremia in that area from 1995 through 2002.
The average population of the county during the study period was 492,845 (9% of the total population of Denmark). During the 8 years of surveillance, 63,166 blood cultures were performed, and 714 episodes of pneumococcal bacteremia were detected. The incidence of pneumococcal bacteremia varied greatly by season, with winter peaks and summer …