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Information concerning health problems in most developing nations is often limited to reviews of the country's yearly statistical reports or to restricted intelligence summaries compiled by various governmental agencies. In the instance of former non-English speaking European colonies, access to available data is difficult and information is often in another language. The Republic of Chad, in central Africa, is but one example of an African nation about which we in this country have almost no information concerning health problems. In this monograph, on the second of five proposed countries selected for comprehensive epidemiological studies by the Geographic Epidemiology Unit of The Johns Hopkins School of Hygiene and Public Health (the first having been Perú), Dr. Buck and his colleagues have compiled a comprehensive picture of the diseases endemic to Chad. The investigating field team represented various medical and para-medical disciplines, ranging from a physician-epidemiologist to a social anthropologist, and the latest available scientific field equipment was utilized to collect specimens, with most of the sophisticated laboratory analyses being accomplished in Baltimore.