title: Effect of prior antibiotics on the susceptibility of Haemophilus influenzae type b to ampicillin.
mesh_terms: D000667:Ampicillin / Q000494:pharmacology*; D000900:Anti-Bacterial Agents / Q000627:therapeutic use*; D006193:Haemophilus influenzae / Q000187:drug effects*; D006801:Humans; D010403:Penicillin Resistance; D011446:Prospective Studies
chemical_list: D000900:Anti-Bacterial Agents; D000667:Ampicillin