Letter: Ampicillin-resistant haemophilus influenzae, type b.
D000667:Ampicillin / Q000494:pharmacology*; D002648:Child; D006193:Haemophilus influenzae / Q000187:drug effects* / Q000302:isolation & purification; D006801:Humans; D008583:Meningitis, Haemophilus / Q000382:microbiology; D008826:Microbial Sensitivity Tests; D010403:Penicillin Resistance
D000667:Ampicillin