title: Severe pneumonia--a continuing story.
mesh_terms: D001419:Bacteria / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D006801:Humans; D007877:Legionnaires' Disease / Q000382:microbiology*; D008297:Male; D008875:Middle Aged; D011014:Pneumonia / Q000382:microbiology*