Legionellosis.
D000818:Animals; D001419:Bacteria / Q000145:classification; D005455:Fluorescent Antibody Technique; D006168:Guinea Pigs; D006801:Humans; D007877:Legionnaires' Disease / Q000453:epidemiology / Q000382:microbiology*; D010414:Pennsylvania; D013154:Spleen / Q000382:microbiology