Ampicillin-resistant Hemophilus influenzae in Canada: nationwide survey of hospital laboratories.
D000667:Ampicillin / Q000627:therapeutic use; D002170:Canada; D002701:Chloramphenicol / Q000627:therapeutic use; D006193:Haemophilus influenzae; D006801:Humans; D008583:Meningitis, Haemophilus / Q000188:drug therapy; D010403:Penicillin Resistance; D012189:Retrospective Studies
D002701:Chloramphenicol; D000667:Ampicillin