SCHICK test surveys and carrier surveys have been carried out in two New York State cities as a part of a study of diphtheria immunity and carrier prevalence in various places in the United States and Canada, sponsored by the diphtheria subcommittee of the Committee on the Evaluation of Administrative Practices of the American Public Health Association. The procedure followed in these surveys and the method of study are the same as those carried out in the other study areas, which have previously been described in detail. The cities selected in New York State for this study were Kingston and Ossining. Kingston is a city of approximately 30,000 population, located on the Hudson River midway between Albany and New York City. It was selected for this study for several reasons: first, because a small but carefully conducted Schick test survey had been carried out by the late Dr. F. W. Laidlaw in 1922,
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