Spread of multiresistant Salmonella typhi.
D000668:Ampicillin Resistance; D002702:Chloramphenicol Resistance; D010154:Pakistan; D012480:Salmonella Infections / Q000453:epidemiology / Q000635:transmission*; D012485:Salmonella typhi / Q000145:classification / Q000187:drug effects*; D014195:Travel; D014296:Trimethoprim Resistance; D006113:United Kingdom / Q000453:epidemiology