title: A 'surprising' pathogen in a man with acute lymphocytic leukemia.
mesh_terms: D000368:Aged; D000818:Animals; D006801:Humans; D007945:Leukemia, Lymphoid / Q000469:parasitology*; D008297:Male; D009894:Opportunistic Infections / Q000469:parasitology*; D011010:Pneumocystis / Q000302:isolation & purification; D011020:Pneumonia, Pneumocystis / Q000469:parasitology*