Dharshini Sangaralingam, Vinobaba Muthuladchumy, Jude Pavilupillai J, Karunaratne S H P Parakrama, Surendran Sinnathamby N
Department of Zoology, Faculty of Science, Eastern University, Chenkalady.
Trop Med Health. 2011 Jun;39(2):47-52. doi: 10.2149/tmh.2010-19. Epub 2011 Jun 14.
Unprecedented incidences of dengue have been reported in Sri Lanka in recent years. The district of Batticaloa, which was devastated by the 2004 Asian tsunami, is one of the districts affected by dengue. One option to curtail this disease is to implement appropriate vector control measures. A nine-month study was carried out within the Batticaloa Municipal Council limit from April to December 2008. Larval collections were conducted fortnightly using conventional ovitraps for nine months covering the dry and wet seasons. Ovitraps (indoor and outdoor) were placed in 15 randomly selected houses. The collected larvae were brought to the laboratory and reared under laboratory conditions. The larval forms and emerged adults were identified on the basis of reported morphological descriptions. The identified adults of 2-3 d old were exposed to common insecticides following the WHO protocol. During the study period, a total of 10,685 Aedes aegypti and Ae. albopictus mosquitoes were collected, with the former constituting 57% of the total sample. Both species were collected from indoor and outdoor ovitraps, and their prevalence was recorded throughout the study period. A seasonal shift was observed in the density, with Ae. aegypti predominating during the dry season and Ae. albopictus during the wet season. Both species were highly resistant to 4% DDT and susceptible to 0.25% permethrin. The continuous presence of potential dengue vectors may have contributed to the dengue prevalence in the district. Since both species can oviposit in indoor and outdoor ovitraps, public awareness and participation should be promoted in the vector control programme of the Ministry of Health along with continuous vector surveillance.
近年来，斯里兰卡报告了前所未有的登革热发病率。2004年受亚洲海啸重创的拜蒂克洛区是受登革热影响的地区之一。减少这种疾病的一种选择是实施适当的病媒控制措施。2008年4月至12月在拜蒂克洛市议会范围内进行了一项为期九个月的研究。使用传统的诱蚊产卵器每两周进行一次幼虫采集，为期九个月，涵盖旱季和雨季。在15所随机挑选的房屋中放置了诱蚊产卵器（室内和室外）。采集到的幼虫被带到实验室并在实验室条件下饲养。根据已报道的形态学描述对幼虫形态和羽化后的成虫进行鉴定。按照世界卫生组织的方案，将鉴定出的2至3日龄成虫暴露于常用杀虫剂中。在研究期间，共采集了10685只埃及伊蚊和白纹伊蚊，前者占总样本的57%。两种蚊子均从室内和室外诱蚊产卵器中采集，并且在整个研究期间记录了它们的流行情况。观察到密度有季节性变化，埃及伊蚊在旱季占主导，白纹伊蚊在雨季占主导。两种蚊子对4%滴滴涕均具有高度抗性，对0.25%氯菊酯敏感。潜在登革热媒介的持续存在可能是该地区登革热流行的原因之一。由于两种蚊子都能在室内和室外诱蚊产卵器中产卵，因此应提高公众意识并鼓励公众参与卫生部的病媒控制计划，同时持续开展病媒监测。
