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S. pneumoniae MDR phenotypes by patient age group in the United States in 2000-2002. Phenotype 1 was resistance to penicillin, azithromycin, and SXT; phenotype 2 was resistance to penicillin, ceftriaxone, azithromycin, and SXT; and phenotype 3 was resistance to penicillin, ceftriaxone, and SXT.
