Evaluation on environmental factors affecting to the mosquito-borne infectious diseases in Southeast Asia

对东南亚3个国家不同自然和社会经济环境的4个地区进行了生态调查，对环境因子对媒介蚊虫和蚊媒传染病的影响进行了数值评价。小鼠密度高，导致泰国北部维持疟疾流行。在龙目岛，印度尼西亚山区村庄的疟疾疫情也比沿海村庄更严重。首次确认出没于暗林的主要媒介蚊种为按蚊。巴拉巴克。该物种具有强烈的食人性、外食性，是一种早夜叮咬者，这表明只使用蚊帐睡觉是不完美的，以避免被叮咬有传播疟疾的风险。一种新的高挥发性拟除虫菊酯浸渍树脂网的驱避性作为另一种防治工具进行了评估。每个室外舞台两张网(约6m^2)可以保护人类诱饵3个月不被咬。在越南的宾福省，另一个山区，主要的媒介是一种。迪鲁斯。疟疾患者和按蚊的空间分布。在越南河内附近的一个农村进行的流行性乙型脑炎及其媒介蚊虫的流行病学调查显示，库蚊是比以前认为的更重要的媒介。这项研究还在蚊子和出现类似日本脑炎症状的患者身上检测到一种名为Namdinh病毒的新病毒。

An ecological survey was conducted in 4 areas in 3 southeast Asian countries with different natural and socio-economical environments to numerically evaluate environmental factors affecting to vector mosquitoes and mosquito-borne infectious diseases.Conserved forest had favored infestation by An. minimus with high density, and resulted in maintaining the malaria epidemic in northern Thailand. In Lombok island, Indonesia malaria epidemic also was more serious in mountainous villages than in coastal ones. The main vector mosquito infested in dark forests was firstly confirmed as An. balabacensis. The species was strongly anthropophagous, exophagous, and an early night biter indicating that using a bed net only for sleeping was imperfect to avoid bites with risk of malaria transmission. The repellency of a new pyrethroid with high volatility impregnated resin net was evaluated as an additional control tool. Two nets per outdoor stage (ca. 6m^2) could protect human baits from biting for 3 months. In Binphuc Province, Vietnam, another mountainous area, the main vector was An. dirus. Spatial distributions of malaria patients and An. dirus were both aggregative but the overlapping of focuses of the two parameters was quite low.An epidemiological survey on Japanese encephalitis and its vector mosquitoes conducted in a rural village near Hanoi, Vietnam revealed that Culex gelidus was more important vectors than as considered before. The study also detected a new virus named Namdinh virus from mosquito and patients showing Japanese encephalitis like symptom.