Legionnaires' disease.
D000368:Aged; D000907:Antibodies, Bacterial / Q000276:immunology; D006801:Humans; D007075:Immunoglobulin M; D007877:Legionnaires' Disease / Q000175:diagnosis* / Q000276:immunology; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies
D000907:Antibodies, Bacterial; D007075:Immunoglobulin M