Dengue control in Sri Lanka targets the removal or treatment of fresh water bearing containers that provide breeding sites for Ae. aegypti . Health authorities have raised concern that the incidence level of dengue remains high in urban settings due to ignorance of dengue mosquito larval surveillance on polluted water drains. The present study was designed to evaluate the presence of Ae. aegypti in the polluted water drains in some urban areas in the country. A preliminary entomological survey was carried out in urban areas from Chilaw to Galle and further studies were carried out in the drains with polluted water that marked the presence of Ae. aegypti larvae. Presence of Ae. aegypti was recorded in drains containing polluted water in Galle city for the first time in Sri Lanka. The most commonly observed species in the preliminary survey was Cx. quinquefasciatus (97.5%) followed by Cx. gelidus (0.99%), Ae. albopictus (0.62%) and Ae. aegypti (0.42%). Water quality characteristics revealed low dissolved oxygen and high conductivity with visible organic pollutants. Constant insecticide pressure and the destruction of the breeding sites through source reduction in vector control campaigns compel the mosquito to adapt to new ecological niches. Therefore, appropriate surveillance and control measures should be implemented by health authorities to control vector mosquitoes and lower the disease burden.

中文翻译：

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斯里兰卡城市污水下水道中埃及伊蚊的预想象发育

斯里兰卡的登革热控制目标是移除或处理为 Ae 提供繁殖场所的淡水容器。埃及人。卫生当局担心登革热在城市环境中的发病率仍然很高，因为不知道对污水排放管进行登革热蚊子幼虫监测。本研究旨在评估 Ae 的存在。埃及一些城市地区污水排放中的埃及伊蚊。在从 Chilaw 到 Galle 的城市地区进行了初步昆虫学调查，并在污水中进行了进一步的研究，这些污水标志着 Ae 的存在。埃及伊蚊幼虫。Ae 的存在。斯里兰卡首次在加勒市的污水下水道中记录到埃及伊蚊。初步调查中最常观察到的物种是Cx。quinquefasciatus (97.5%) 其次是 Cx。gelidus (0.99%), Ae。albopictus (0.62%) 和 Ae。埃及 (0.42%)。水质特征显示低溶解氧和高电导率以及可见的有机污染物。持续的杀虫剂压力和通过减少病媒控制活动的源头破坏繁殖地迫使蚊子适应新的生态位。因此，卫生当局应采取适当的监测和控制措施，以控制病媒蚊子并降低疾病负担。持续的杀虫剂压力和通过减少病媒控制活动的源头破坏繁殖地迫使蚊子适应新的生态位。因此，卫生当局应采取适当的监测和控制措施，以控制病媒蚊子并降低疾病负担。持续的杀虫剂压力和通过减少病媒控制活动的源头破坏繁殖地迫使蚊子适应新的生态位。因此，卫生当局应采取适当的监测和控制措施，以控制病媒蚊子并降低疾病负担。