中华按蚊在低微丝蚴率、低密度地区传播马来丝虫病的研究

TRANSMISSION OF MALAYAN FILARIASIS IN AREAS WITH ANOPHELES SIMINSIS VECTOR AND LOW MICROFILARIAL RATE AND DENSITY

在经防治后以中华接蚊为媒介的低微丝蚴率和低密度的马来丝虫病流行区的三个村．进行了丝虫病传播状况观察。观察期间，每年对试点村人群进行血检．检出的微丝蚴血症者仅用维生素Ｃ安慰治疗，同时收集蚊媒各项有关参数，计算年叮人率和年传播潜势。结果显示：微丝蚴率低于１．５５％、微丝蚴密度小于１５条／１２μｌ，不再采取任何防治措施、丝虫病传播已停止；微丝蚴率为２．３１％，微丝蚴密度大于２２条／１２０μｌ时，其微丝蚴率仍在原水平徘徊。

A field observation was conducted in 3 demonstration villages selected from malayan filariasis endemic areas with low microfilarial rate (MFR ) and microfilarial density (MFD), and An.sinensis as chief vector. Blood samples of all the population were examined from 1982 to 1985 and from 1986 to 1989 respectively. The patients with microfilariae wera treated with vitamin C as placebo. The mosquitoes were collected from man houses for calculation of annual man-biting rate and annual transmission potential. The results showed that after MFR being controlled under 1. 55% and MFD<15 mf/120 μl. the fialriasis transmission would be interrupted. But when the MRF was 2. 31 % and MFD>22 mf/120μl. the MFR would be fluctuated around the level of 2.31 %.