班氏丝虫病不同防治阶段媒介传播作用的研究

Effect of Vector Transmission at Different Stage of Bancroftian Filariasis Control

目的了解广东省班氏丝虫病主要传播媒介在丝虫病不同防治时期传播作用的变化。方法在班氏丝虫病流行区对致倦库蚊自然感染情况调查,并对其相关参数进行观察。结果 1956～1969年,全省进行了广泛调查,致倦库蚊是优势品种,占97．76％(731505／748239),在发现幼丝虫感染的蚊种中,致倦库蚊自然感染率最高,为9．94％,且仅在其体内发现L3(感染期幼虫),L3率为0．22％,是班氏丝虫病的主要传播媒介。在防治前、防治阶段、基本消灭阶段和消灭阶段,致倦库蚊的自然感染率分别为9．94％、6．02％、0．04％、和0,随着防治工作的深入,呈下降趋势,1993年未发现感染期幼虫。各阶段传播媒介年传播潜势分别为10486．21、 5131．89、124．30和0。结论防治后期班氏丝虫病的传播已被阻断。

Objective To understand how the vector transmission can influent the control of bancroftian filariasis at different stage in Guangdong province. Method The proportion of each kind of mosquito in living room in epidemic area, and the situation of natural infection causing by mosquito were analyzed. Results A large scale survey of mosquito vectors was carried out in the epidemic areas of bancroftian filariasis from 1956 to 1969. The larva of C. quinquefasciatus, Culex bitaeniorhynchus, Culex tritaeniorhynchus, An. sinensis ,and An.minimus were found and their natural infection rates were 9.94%, 1.46%, 6.77%, 2.24% and 3.11%, respectively. The infection stage larva （L3） could be found in C. quinquefasciatus only, with a rate of 0.22%.C. quinquefasciatus was the major kind of mosguito in living room in endemic area （97.76%,731505/748239）. These showed that C. quinquefasciatus was the transmission vector of bancroftian filariasis. In the stage of before control, during control, basic control and postperied of control, the annual transmission potential （ATP） of C. quinquefasciatus were 10486.21,5131.89,124.30 and 0, respectively. Conclusion The results indicated that the transmission had been blocked in the postperiod of filariasis control in Guangdong province.