The procedure followed in obtaining data for this report is described in the review of typhoid mortality for the same cities.1 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 reported in 1946. Comment was also sought on any special outbreak of diphtheria or change in age incidence; also any special program to secure the protection of children against this disease. In calculating death rates the 1940 census figures were used. Footnotes indicate corrections in rates for those cities for which the Bureau of the Census has prepared official estimates for years subsequent to 1940.
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 years. Such symbols indicate those cities
DIPHTHERIA MORTALITY IN LARGE CITIES IN THE UNITED STATES IN 1946TWENTY-SECOND REPORT. JAMA. 1947;134(18):1540–1546. doi:10.1001/jama.1947.72880350006007a