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本文首次报道了云南省大山区人工感染的阳性钉螺在野外饲养条件下的平均寿命和逸蚴量。1987年8月感染的幼螺,3个月后,首次分离出135只阳性钉螺。从初次逸蚴起,存活至翌年6～9月的生存率分别为27.4、16.3、13.3和11.9％;平均逸蚴量依次为139.9、29.6、39.2和75条。阳性钉螺平均寿命为171.6d。每只阳性钉螺生存期平均逸蚴量为673条。当地阳性钉螺平均传播期估计可达半年以上。这对大山区血吸虫病流行因素的定量分析和防治策略的制定有其参考意义。
This paper reports for the first time the average life expectancy and the amount of larvae of the adult snails infected by artificial infection in the mountainous areas of Yunnan Province under field conditions. Thirteen young snails were infected in August 1987 and 135 positive snails were isolated for the first time after three months. The survival rate from the first larvae to June to September in the following year was 27.4, 16.3, 13.3 and 11.9%, respectively. The average laxivorous quantities were 139.9, 29.6, 39.2 and 75 respectively. The average life expectancy of positive snails was 171.6 days. The average survival time of each positive snail larvae was 673. The local positive snail average transmission period estimated up to more than six months. This mountainous areas schistosomiasis epidemic factors quantitative analysis and prevention and control strategies have their reference value.