A bacteriologic study of pneumonia in children was carried on at Bellevue Hospital during the winters of 1928 to 1929 and 1929 to 1930. It has long been known that, unlike cases in adults, the fixed types I, II and III have been responsible for a relatively small percentage of cases of pneumonia in children, while according to the literature group IV has shown a much higher incidence, from 30 to 74 per cent. With the isolation of the new types of pneumococci by Cooper, Edwards and Rosenstein from those previously unclassified and erroneously known as group IV, Dr. William H. Park began an investigation of the incidence of the recently identified types in pneumonia in infancy and childhood. The cases used for study have been taken from the children's medical service at Bellevue Hospital, of which Dr. Charles Hendee Smith is director. During the first year, ten new types
RAIA A, PLUMMER N, SHULTZ S. NEW TYPES OF PNEUMOCOCCI IN THE PNEUMONIAS OF CHILDREN. Am J Dis Child. 1931;42(1):57–68. doi:10.1001/archpedi.1931.01940130064005
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