Penicillin-resistant pneumococci in the United States.
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Kaplan
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D006801:Humans; D008826:Microbial Sensitivity Tests; D010403:Penicillin Resistance; D011008:Pneumococcal Infections / Q000188:drug therapy* / Q000453:epidemiology; D013296:Streptococcus pneumoniae / Q000187:drug effects*; D014481:United States / Q000453:epidemiology