Legionnaires' disease.
D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D007484:Iowa; D007877:Legionnaires' Disease / Q000175:diagnosis / Q000453:epidemiology*; D008297:Male; D008875:Middle Aged; D012141:Respiratory Tract Infections / Q000453:epidemiology*