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(一)根据调查结果,试验区田中钉螺绝大部份(98.18％)分布在距田埂一公尺范围内,此点与在皖南歙县水改旱地区田中钉螺分布情况,有类似现象。在钉螺自然死亡率与阳性感染率方面,似有距田埂愈远死亡率愈高而阳性感染率愈低的趋向,尤以距田埂1公尺内外较为显著。由于以上原因,故消灭田中钉螺只局限于距田埂1公尺内具有重要意义。
(1) According to the survey results, most of the snails in the field (98.18%) are located within one meter from the ridge, which is similar to the distribution of Oncomelania in the field in the drought-affected area in Pixian, Anhui Province. Snail natural mortality and positive infection rate, it seems that the farther away from the field, the higher the mortality rate and the lower the positive rate of infection, especially within 1 meter away from the field 埂 more significant. Due to the above reasons, it is of great significance to eliminate the Oncomelania snail only limited to 1 meter away from the ridge.