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云南钉螺呈割裂状分布,以坝区为主。钉螺面积以田居多,其次是灌溉沟。坝区钉螺主要分布在小的灌溉沟和稻田埂,山区钉螺主要分布在梯田高埂壁。春季是钉螺交配高峰期,钉螺平均寿命为10.59月。钉螺孳生环境比较稳定,扩散不明显。感染性钉螺则散在性分布在各类环境中,坝区感染性钉螺主要分布在沟道,山区感染性钉螺主要分布在梯田高埂壁。全年均可查见感染性钉螺,但每年有1个高峰,阳性螺点的疫源性也相对稳定。云南感染性钉螺生存期平均逸蚴量为673条/只,阳性钉螺的寿命,从首次逸蚴算起,平均为171.6 d。感染性钉螺有转阴现象。根据云南钉螺生态学特征查灭螺工作可逐片、逐块推开,做到查1块、灭1块、巩固1块,且以春、秋2季各开展1次灭螺最好。云南钉螺孳生环境比较稳定,钉螺调查以历史有螺区为主,兼顾毗邻地带,不宜盲目扩大。阳性螺点灭螺应适当扩大范围,最好扩大到阳性螺点所在的整个自然片,阳性螺点实施灭螺后要经常开展监测或进行巩固性灭螺。
Yunnan snail was split-like distribution to the dam-based. Snail area to Tian Ju, followed by irrigation ditch. The snails in dam area are mainly distributed in small irrigation ditch and paddy fields, and the snails in mountainous area are mainly distributed in the high ridge wall of terrace. Spring is the snail mating peak, snails average life expectancy of 10.59 months. Snail breeding environment is relatively stable, the proliferation is not obvious. Infectious snails were randomly distributed in various types of environment, the dam snails infective mainly located in the channel, mountain snails infective mainly distributed in the high ridge wall. Infectious snails can be found throughout the year, but there is a peak every year. Positive foci are also relatively stable. The average life-span larva of infectious snails in Yunnan was 673 larvae, and the life span of positive snails was 171.6 days from the first larva. Infectious snails have a negative phenomenon. According to the ecological characteristics of snail snail check snail work can be piece by piece, pushed open block by block, so check one, destroy one, consolidate one, and the spring and autumn in each of the two carried out a snail best. Yunnan snail breeding environment is relatively stable, Snail investigation with a history of snail zone-based, taking into account the adjacent area, not blindly expand. Positive snail point should be appropriate to expand the scope of the snail, it is best to expand to the positive snail point where the entire natural piece, positive snail point after the implementation of the snail to carry out regular monitoring or consolidation of snail.