After Dochez and Gillespie's1 differentiation of pneumococci in 1913, Wollstein and Benson2 reported the bacteriologic findings in 50 infants and children with pneumonia. They isolated group IV pneumococci from 60 per cent and type I pneumococci from only 8 per cent of their patients. In a high percentage of cases of pneumonia in infants and children the condition was shown to be etiologically related to group IV pneumococci by many studies made prior to 1929, when group IV was further differentiated by Cooper3 and her co-workers. It is now possible to evaluate the various pneumococci from types IV to XXXII, formerly included as members of group IV. Observations concerning the epidemiology and clinical manifestations of the various pneumococci are shown in the charts and tables. We believe that the accurate classification of pneumococci is of more than academic interest.
The bacteriologic study of all patients with pneumonia
LEE NEMIR R, ANDREWS ET, VINOGRAD J. PNEUMONIA IN INFANTS AND IN CHILDREN: A BACTERIOLOGIC STUDY WITH SPECIAL REFERENCE TO CLINICAL SIGNIFICANCE. Am J Dis Child. 1936;51(6):1277–1295. doi:10.1001/archpedi.1936.01970180023003
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