基本消灭丝虫病后残存微丝蚴血症者传播作用的研究

ON THE TRANSMISSION ROLE OF RESIDUAL MICROFILAREMIA CASES IN THE AREA WITH FILARIASIS VIRTUALLY ERADICATED

本文报告1984～1988年对基本消灭班氏丝虫病地区残存微丝蚴血症者传播作用的现场实验观察结果,在达到基本消灭丝虫病的指标后,不再采取防治措施,人群微丝蚴率和感染度在继续下降,没有发现新感染者;残存微丝蚴血症者虽然密度较高,亦可陆续转阴。致倦库蚊自然感染率和感染度也逐年下降,至第四和第五年已不再发现蚊媒有丝虫感染,表明丝虫病的传播已被阻断。

The transmission role of the residual microfilaremia cases was studied in Pingle Village, Liangqing Township, Yongning County where bancroftian filariasis had been virtually eradicated during 1984-1988. The results indicated that after the microfilarial rate of the human population met the criterion of elimination of f ilariasis, namely below 1% of the total population in all the administrative villages, and the average density of microfilana being around 5 per 60μl peripheral blood, subsequent control measures might be no Ion- ger instituted while the microfilaria rate and its density could continue to decline. Some residual microfilaremiae cases having higher microfilarial density turned negative gradually, so did the natural infection rate of Culex quinquefasciatus with filaria larvae and its density year by year. No filaria larvae were found in vector mosquitoes in 1987-1988. The authors deemed that the filariasis transmission in this area has been interrupted.