[Development of pneumonia and the immunological background--with special reference to opportunistic infection].
D001424:Bacterial Infections / Q000209:etiology*; D006801:Humans; D007165:Immunosuppression Therapy / Q000009:adverse effects*; D008172:Lung Diseases, Fungal / Q000209:etiology*; D011014:Pneumonia / Q000209:etiology*