title: Discovery of occult legionella pneumonia in a long stay hospital: results of prospective serological survey.
mesh_terms: D003428:Cross Infection / Q000175:diagnosis / Q000382:microbiology; D006801:Humans; D007875:Legionella / Q000302:isolation & purification; D007877:Legionnaires' Disease / Q000175:diagnosis* / Q000382:microbiology; D008134:Long-Term Care; D011014:Pneumonia / Q000175:diagnosis* / Q000382:microbiology; D011446:Prospective Studies