title: Landmark perspective: The atypical pneumonia syndrome.
mesh_terms: D049673:History, 20th Century; D006801:Humans; D009175:Mycoplasma Infections / Q000266:history; D011014:Pneumonia / Q000266:history* / Q000382:microbiology; D011024:Pneumonia, Viral / Q000266:history*; D009626:Terminology as Topic; D014481:United States