title: Effect of rifampin on nasopharyngeal carriage of Haemophilus influenzae type b.
mesh_terms: D000667:Ampicillin / Q000494:pharmacology; D002353:Carrier State / Q000188:drug therapy* / Q000382:microbiology; D002675:Child, Preschool; D006193:Haemophilus influenzae / Q000187:drug effects*; D006801:Humans; D007223:Infant; D008826:Microbial Sensitivity Tests; D009305:Nasopharynx / Q000187:drug effects / Q000382:microbiology*; D012293:Rifampin / Q000494:pharmacology*
chemical_list: D000667:Ampicillin; D012293:Rifampin