Letter: chloramphenicol- and ampicillin-resistant typhoid fever.
D000667:Ampicillin / Q000494:pharmacology* / Q000627:therapeutic use; D002701:Chloramphenicol / Q000494:pharmacology* / Q000627:therapeutic use; D006801:Humans; D010403:Penicillin Resistance; D012485:Salmonella typhi / Q000187:drug effects*; D014435:Typhoid Fever / Q000188:drug therapy*
D002701:Chloramphenicol; D000667:Ampicillin