Investigation on human Ascaris infection in Gansu

Objective To understand the prevalence of A. Lumbricoides in Gansu province, and we provide scientific basis for the development of prevention and control strategies. Methods Stratified cluster random sampling applied, the ecological zones and the annual per capita net income of farmers were taken as sub-layer samples. Kato-Katz thick smear technique applied for investigation. Infection rate was analyzed using Chi square test. Results A total of A. Lumbricoides infection rate in the population was 1.82% (326/17 937) in 70 sampling points, within 24 counties (county level cities, districts), which belong to 10 cities (prefectures), constitute rate of mild level infection, medium level and severe level was 98.24% (320 cases), 1.47% (5 cases) and 0.29% (1 case), respectively. The infection rate was 1.81% in males and 1.82% in females, and there was no significant difference between different sexes ( P >0.05). The infection rate of Ascaris was the highest (4.39%) in 0- 0.05)。人群普遍易感蛔虫, 蛔虫感染率0〜<5岁组最髙 (4.39%)年龄组感染率采用趋势 χ 2 检验, 随年龄增加蛔虫感染率降低( Z =36.48, P <0.001),差异有统计学意义;学龄前 文化程度感染率高于其他组( P <0.01);山区地形感染率高于其他3类地形( P <0.005)。黄土高原-江河源区-甘南生态 区人群蛔虫感染率低于其他生态区, 差异有统计学意义( P <0.05)。人群蛔虫感染率较高的地区是武威市、定西市、酒泉 市、除南市, 感染率分别是4.40%、3.20%、2.44%和1.96%。 结论 甘肃省人群蛔虫感染率和感染度显著下降, 但蛔虫病 仍是危害儿童健康的重点寄生虫病。土源性线虫病在甘肃省局部特别是边远山区流行严重, 应广泛开展健康教育, 加 强山区及儿童人群防控措施。