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1987—1991年,我们采用饱和硝酸钠漂浮法作土壤虫卵分离调查。对每年春秋两季连续5年化疗的实验村的庭院、菜地和粪缸周围土壤中的寄生虫虫卵进行连续观察。化疗村在化疗后第2—5年土壤虫卵的检出率分别为28.67%、29.00%、24.67%和11.33%,存在逐年显著降低的趋势(X~2=26.54,P<0.001),不同环境中蛔虫卵和鞭虫卵的检出率及阳性密度亦逐年减少,且较对照村为低;结果表明反复化疗显著减少环境中虫卵污染。
1987-1991, we use the saturated sodium nitrate floatation method for the investigation of soil insect eggs. The paragonimus eggs in the soil around the dung of the courtyard, vegetable fields and dung tanks of the experimental village where the annual spring and autumn seasons were consecutively treated for 5 years were continuously observed. The detection rates of soil eggs in the chemotherapy villages from the second year to the fifth year after chemotherapy were 28.67%, 29.00%, 24.67% and 11.33%, respectively, which showed a trend of decreasing year by year (X ~ 2 = 26.54, P <0.001) Ascaris eggs and whipworm eggs in the environment the detection rate and positive density also decreased year by year, and the control village is low; the results show that repeated chemotherapy significantly reduce the environment of egg pollution.