TYPE SPECIFICITY IN PNEUMONIA AND PNEUMOCOCCIC INFECTIONS

Abstract
Clinical, bacteriologic and epidemiologic questions arise from the more exact differentiation of the old group IV pneumococcus into twenty-seven specific serologic groups. In view of the work of Cooper1on the separation of these newer types of pneumococci, a review of the incidence of pneumococcus types in various localities is in order. As there are no data available concerning type specificity of pneumococci found in pneumonia in a general hospital in this locality, it was thought worth while to present some of the results of a study that is being made at San Francisco Hospital; in the present paper the survey covers the period from December 1932 to December 1935. The incidence of types and the sources of pneumococci from infections other than pneumonia during this period have been included in the report. During the first part of the study, the pneumococci were classified by use of serums of

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