Legionnaires' disease...where does it come from?
D002487:Centers for Disease Control and Prevention, U.S.; D005617:Chlorofluorocarbons, Methane / Q000009:adverse effects*; D006801:Humans; D007877:Legionnaires' Disease / Q000209:etiology* / Q000517:prevention & control; D011635:Public Health Administration; D014481:United States