title: Lung involvement in progressive vaccinia.
mesh_terms: D002675:Child, Preschool; D006801:Humans; D008171:Lung Diseases / Q000209:etiology*; D008297:Male; D011010:Pneumocystis / Q000302:isolation & purification; D011020:Pneumonia, Pneumocystis / Q000150:complications; D014615:Vaccinia / Q000150:complications*