title: [The investigation of an outbreak of Legionnaires disease in a unit, Beijing].
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002353:Carrier State; D002681:China; D004196:Disease Outbreaks; D005260:Female; D006801:Humans; D007877:Legionnaires' Disease / Q000453:epidemiology*; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies