1This work was supported by National Institutes of Health Grant No. 2R07AIl0048-11 ICC (Washington) and by a special grant from the Christian Agency for Social Action, World Council of Churches (Geneva). The Johns Hopkins University Center for Medical Research and Training Calcutta, India Reprint requests to Dr. Simpson, Department of Pathobiology, The Johns Hopkins University School of Hygiene and Public Health, 615 North Wolfe Street, Baltimore, Md., 21205
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