title: Changing profile of bacterial pneumonias.
mesh_terms: D000328:Adult; D000368:Aged; D001424:Bacterial Infections / Q000209:etiology*; D005260:Female; D006801:Humans; D008168:Lung / Q000382:microbiology; D008297:Male; D008875:Middle Aged; D011014:Pneumonia / Q000209:etiology*; D013183:Sputum / Q000382:microbiology