title: Source of infection in nosocomial pneumonia.
authors.forename: A G
authors.initials: AG
authors.lastname: Johnson
mesh_terms: D001424:Bacterial Infections / Q000209:etiology*; D003428:Cross Infection / Q000209:etiology*; D004383:Duodenogastric Reflux / Q000150:complications*; D006801:Humans; D011014:Pneumonia / Q000209:etiology* / Q000382:microbiology