title: Changing pharyngeal bacterial flora of hospitalized patients. Emergence of gram-negative bacilli.
mesh_terms: D000328:Adult; D000900:Anti-Bacterial Agents / Q000627:therapeutic use; D001419:Bacteria / Q000302:isolation & purification*; D001431:Bacteriological Techniques; D006760:Hospitalization; D006801:Humans; D008875:Middle Aged; D010614:Pharynx / Q000382:microbiology*; D011014:Pneumonia / Q000209:etiology; D011175:Positive-Pressure Respiration; D013997:Time Factors
chemical_list: D000900:Anti-Bacterial Agents