title: Study: atypical pneumonias not as rare in elderly as believed.
mesh_terms: D000367:Age Factors; D000368:Aged; D002690:Chlamydia Infections / Q000453:epidemiology* / Q000382:microbiology; D016993:Chlamydophila pneumoniae; D006801:Humans; D009820:Ohio / Q000453:epidemiology; D011014:Pneumonia / Q000453:epidemiology* / Q000382:microbiology; D011446:Prospective Studies