Intestinal Parasites of Man in British North Borneo

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  • U. S. Naval Medical Research Unit No. 2, Taipei, Taiwan
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The incidence of intestinal protozoa and helminths in a total of 1089 persons (mixed ages, backgrounds, localities, ethnic groups, etc.) in the Colony of British North Borneo was determined by examination of a single stool specimen by the direct smear (MIF) and the MIFC concentration techniques. Overall prevalences for the protozoa were much less than expected in an area where epidemiological conditions appeared to favor parasitization. Entamoeba histolytica occurred in only 0 to 3% of seven groups of people, indicating that amebiasis may not necessarily be a disease of great concern in all populations of the tropics. Other protozoa also occurred in limited numbers, i.e., Entamoeba hartmanni, 0 to 12%; Entamoeba coli, 4 to 30%; Endolimax nana, 2 to 12%; and Iodamoeba bütschlii, 0 to 2%. Giardia and Chilomastix occurred in 3 to 16 and 0 to 1% respectively of the people examined.

Hookworm (27 to 72%), Ascaris (13 to 74%), and Trichuris (41 to 89%) infections were commensurate with epidemiological conditions in the area, but Trichostrongylus was not recorded. Hymenolepis and Taenia were rare and Clonorchis occurred only in Chinese who probably acquired infections outside Borneo. Several persons passed eggs of heterophyid and unidentified trematodes.