The procedure followed in obtaining data for this report is described in the review of typhoid mortality for these same cities.1 Briefly, a communication was addressed to the health officer of each of the cities requesting the number of deaths from diphtheria both among residents and among nonresidents which were recorded in 1942. Inquiry was also made of the percentage of children under 5 years of age who had received a complete series of diphtheria protective treatments as of Dec. 31, 1942. Such figure if available should give an approximate indication of the percentage of children who had received such treatment before entering school for the first time. In calculating death rates the 1940 census figures were used. The practice of charging all deaths, both among residents and among nonresidents, against the individual city has been continued with the inclusion of appropriate symbols similar to those employed in previous
DIPHTHERIA MORTALITY IN LARGE CITIES OF THE UNITED STATES IN 1942: TWENTIETH ANNUAL REPORT. JAMA. 1943;122(16):1079–1083. doi:10.1001/jama.1943.72840330010006a
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