title: Letter: Chloramphenicol-resistant Salmonella typhi.
mesh_terms: D000667:Ampicillin / Q000627:therapeutic use; D002701:Chloramphenicol / Q000494:pharmacology*; D006801:Humans; D008826:Microbial Sensitivity Tests; D010403:Penicillin Resistance; D012485:Salmonella typhi / Q000187:drug effects*; D014435:Typhoid Fever / Q000188:drug therapy
chemical_list: D002701:Chloramphenicol; D000667:Ampicillin