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October 8, 1927


JAMA. 1927;89(15):1253-1254. doi:10.1001/jama.1927.02690150063021

The striking and characteristic clinical picture that lobar pneumonia presents has made the disease familiar for many generations both to physicians and to the public. Its specific infectious nature has been recognized for fully half a century. In more than nine tenths of all the cases of lobar pneumonia the pneumococcus is involved, an occasional variant pathogenic micro-organism such as a hemolytic streptococcus or more rarely the influenza bacillus entering into the etiologic rôle. A feature of the study of pneumonia was the differentiation of pneumococci into types based on their capacity to produce specific agglutinins, precipitins and protective substances. Most of the strains encountered in patients with pneumonia represent three fixed types of a highly parasitic nature and now commonly designated as types I, II and III, type IV being designated sometimes as the "waste basket" group because it includes the residual variants.

Of late the desirability of careful