title: [Opportunistic infection in medicine: study on its causative organisms (author's transl)].
mesh_terms: D001419:Bacteria / Q000302:isolation & purification*; D001424:Bacterial Infections / Q000382:microbiology*; D006801:Humans; D011014:Pneumonia / Q000382:microbiology; D012706:Serratia marcescens / Q000302:isolation & purification