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INTRODUCTION During the past quarter century, following the reports of Wood (1912) and the Rockefeller Sanitary Commission (1914, 1915), much attention has been given to the problem of human intestinal parasite infections in the southern United States, and including the more temperate regions of the Appalachian Mountains and the foothills extending east, south and west from the mountains proper, (Cort, Otto and Spindler, 1930; Otto, Cort and Keller, 1931; Otto, 1932; Otto and Cort, 1934; and Otto, 1936a). At first these studies were concerned primarily with certain helminth infections, such as hookworm, Ascaris, and Trichuris, among rural population groups. More recently, attention has also been given to the incidence of protozoan intestinal parasite infections for this same general region, and valuable data have been added by various workers (Meleney, 1930; Faust, 1930, 1931; Meleney, Bishop and Leathers, 1932; Byrd, 1936, 1937; Faust and Headlee, 1936; Swartzwelder, 1938).
Received March 14, 1942.
* Read before the American Society of Tropical Medicine, Louisville, Kentucky, November 13, 1940.
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