Abstract:

Objective To explore the relationship between fecal examinations and worm collection results in a community in? vestigation of Ascaris lumbricoides infection. Methods A total of 1 019 residents in Zhangxi Village，Nanchang County，Jiangxi Province were investigated with the Kato?Katz technique and worm collection after deworming. Results Among 1 019 residents in? vestigated，the actual prevalence of A. lumbricoides was 30.23%，and the egg and worm positive rates were 20.41％ and 23.75%， respectively. The average burden was 2.64 worms per person，and the heavier worm burden accounted for less proportion. The heavier the worm burden，the higher the probability to got egg in the feces. If one person had 7 worms or more，the probability to got eggs in his feces was 100%. Among people of false negative fecal examination，61.00% of them were infected with male worms only，whereas 7.00% were infected with immature female worms with or without male worms，and 32.00% were infected with ma? ture female worms with or without male worms. Totally 32.47% of infected people were missed by fecal examination，including 22.08% without egg excreted，and 10.39% missed because of the method itself. Conclusion The egg positive rate is obviously lower than the actual infection rate，and the egg detection rate is correlated with the worm burden.

Key words: Ascaris lumbricoides；Fecal examination；Infection rate；Miss rate

摘要：

目的探讨社区人群蛔虫感染调查中粪检与驱虫结果的关系。方法选择江西省南昌县塘南乡张溪村为试点，采用Kato?Katz法粪检，双羟萘噻嘧啶化疗驱虫后收集虫体，对两者结果进行比较分析。结果共检测1 019名村民，人群实际蛔虫感染率为30.23%，其中粪检阳性率为20.41％，淘虫阳性率为23.75%。淘虫阳性感染者平均虫荷2.64条，虫荷数高的感染者所占比例较低。感染者虫荷数越多，检出虫卵的概率越高，当感染者寄生7条以上蛔虫，虫卵检出率为100％。粪检虫卵假阴性者中，感染雄虫者占61.00％，感染雌虫幼虫并有或无雄虫者占7.00％，感染成熟雌虫者占32.00％。人群粪检虫卵漏检率为32.47%。其中，因不排虫卵（生物学）漏检率为22.08%，Kato?Katz法（方法学）漏检率为10.39%。结论人群蛔虫感染调查中粪检阳性率较实际感染率偏低，粪检虫卵检出率与感染虫荷数有关。

关键词: 蛔虫；粪检；感染率；漏检率