Penicillin-resistant alpha-hemolytic streptococci in children with heart disease who taken penicillin daily.
D006331:Heart Diseases / Q000188:drug therapy*; D006801:Humans; D010403:Penicillin Resistance; D010406:Penicillins / Q000008:administration & dosage* / Q000494:pharmacology; D012463:Saliva / Q000382:microbiology; D013291:Streptococcus / Q000502:physiology
D010406:Penicillins