title: Source of infection in nosocomial pneumonia.
authors.forename: D D
authors.initials: DD
authors.lastname: Tran
mesh_terms: D001424:Bacterial Infections / Q000209:etiology*; D003428:Cross Infection / Q000209:etiology*; D006801:Humans; D011014:Pneumonia / Q000209:etiology* / Q000382:microbiology; D011015:Pneumonia, Aspiration / Q000382:microbiology