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Investigators from the Centers for Disease Control and Prevention using an active population- and laboratory-based surveillance system monitored invasive pneumococcal infections in 44 counties (in Oregon, Minnesota, California, Maryland, Georgia, and New York) and the State of Connecticut between January 1, 1996 and December 31, 2001. In 2000, the total population under surveillance was 16 million (including 433,591 children <2 years …
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