title: [The analysis of background factors of pneumonia caused by opportunistic pathogens].
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000008:administration & dosage; D001424:Bacterial Infections / Q000209:etiology*; D003520:Cyclophosphamide / Q000008:administration & dosage; D051379:Mice; D009894:Opportunistic Infections / Q000209:etiology*; D011014:Pneumonia / Q000209:etiology*
chemical_list: D000900:Anti-Bacterial Agents; D003520:Cyclophosphamide