title: Acquisition of typhoid fever from proficiency-testing specimens.
mesh_terms: D000328:Adult; D000391:Air Microbiology; D001431:Bacteriological Techniques / Q000592:standards*; D019411:Clinical Laboratory Techniques / Q000592:standards*; D005260:Female; D006801:Humans; D007757:Laboratory Infection / Q000209:etiology*; D008875:Middle Aged; D012485:Salmonella typhi / Q000302:isolation & purification; D014435:Typhoid Fever / Q000209:etiology* / Q000635:transmission