Pneumococci with increased resistance to penicillin.
D000667:Ampicillin / Q000627:therapeutic use; D006801:Humans; D007273:Injections, Intramuscular; D009512:New Guinea; D010400:Penicillin G / Q000008:administration & dosage / Q000494:pharmacology*; D010403:Penicillin Resistance; D011008:Pneumococcal Infections / Q000188:drug therapy; D012703:Serotyping; D013296:Streptococcus pneumoniae / Q000187:drug effects*
D000667:Ampicillin; D010400:Penicillin G