病灶村指数—考核疟疾防制的指标

Focal Index— Parameter for the Evaluation of Malaria Control.

在制定消灭残存疟疾时除了要求病例数的下降外 ,还要注意病灶区的消灭 ,现根据蚊虫在自然村寨周围活动的规律 ,疟疾病例在村中分散或集中的情况对蚊群感染机率的影响 ,提出“病灶村指数”作为一项指标 ,以评价防治计划的落实和效果的好坏。

So far the incidence of malaria has been decreased to a relative low level in China, We have to pay more attention to eliminate malaria focus in the epidemic area which is one of the new and more important strategies of malaria eradication/control programme. It is suggested that the focal index can be used as a useful parameter to evaluate the implementation of operational programme and/or the control method. Focal Index (FI) is defined as the average cases per focal village. Due to the malaria cases are more concentrating in the same village, then the local vector population will be infected easily and dangerous, than that those malaria cases distributed separatelyin in different village. So the FI has to be weighted according to the number of case per village as following: WFI=(∑n2m)/∑n, where n = malaria case(s) in the village, n=1,2,3,......n, m=villages have the same number of malaria case(s). WFI = Wighted Focal Index Some time the FI and/or WFI has to be corrected by: Correct factor=∑v/M, ∑v=total villages of malaria cases have been found in the experimental or administrative area .M=total villages in this area (malara villages plus non malaria villages). The Corrected WFI (CWFI)=(∑v/M)×[(∑n2m)/∑m] These parameters, especially the CWFI are very useful to evaluate the control programme and check the implemantation of operantional control programme.