关键词: 寄生虫, 感染率, 流行病学调查

Abstract: Being a part of the nationwide practice, a survey of human parasite distribution was undertaken in Xizang Autonomous Region from May 1988 to October 1990, covering 10 315 people residing in 30 pilot sites of 13 counties. The total infection rate in the study population was recorded as 51.6%, showing 24 species of parasites, i.e. 10 species of protozoa, 9 species of nematodes and 5 species of cestodes with infection rates as follows: Entamoeba histolytica 8.1%, Entamoeba coli 13.3%, Entamoeba hartmanni 1.5%, Endolimax nana 3.3% , Iodamoeba buetschlii 8.5%, Giardia lamblia 8.2%, Trichomonas hominis 0.02%, Balantidium coli 0.01%, Blastocystis hominis 0.3%, Sarcocystis sp.12.6% , Ascaris lumbricoides 6.0%, Trichuris trichiura 2.3%, Enterobius vermicularis 11.5%, hookworm 0.3%, Strongyloides stercoralis 0.01%, Trichostrongylus sp. 0.04%, Rhabditida sp.0.03%, Trichinella spiralis 26.8%, Taenia sp. 8.5%, Hymenolepis diminuta 0.1%, Hymenolepis nana 1.5%, Echinococcus sp. 34.9%, Diphyllobothrium sp. 21.4% (the critical situation of human parasitic infections in Xizang is noteworthy). Among the detected parasites, Entamoeba hartmanni, Trichomonas hominis, Blastocystis hominis, Rhabditida sp., Trichostrongylus sp. were the first records in situ . Topography, socioeconomic status as well as customs and habits of local inhabitants were deemed important in the prevalence of parasitic infections.