Duncombe Jennifer, Espino Fe, Marollano Kristian, Velazco Aldwin, Ritchie Scott A, Hu Wen-Biao, Weinstein Philip, Clements Archie C A
Geospat Health. 2013 Nov;8(1):255-65. doi: 10.4081/gh.2013.71.
Entomological surveillance and control are essential to the management of dengue fever (DF). Hence, understanding the spatial and temporal patterns of DF vectors, Aedes (Stegomyia) aegypti (L.) and Ae. (Stegomyia) albopictus (Skuse), is paramount. In the Philippines, resources are limited and entomological surveillance and control are generally commenced during epidemics, when transmission is difficult to control. Recent improvements in spatial epidemiological tools and methods offer opportunities to explore more efficient DF surveillance and control solutions: however, there are few examples in the literature from resource-poor settings. The objectives of this study were to: (i) explore spatial patterns of Aedes populations and (ii) predict areas of high and low vector density to inform DF control in San Jose village, Muntinlupa city, Philippines. Fortnightly, adult female Aedes mosquitoes were collected from 50 double-sticky ovitraps (SOs) located in San Jose village for the period June-November 2011. Spatial clustering analysis was performed to identify high and low density clusters of Ae. aegypti and Ae. albopictus mosquitoes. Spatial autocorrelation was assessed by examination of semivariograms, and ordinary kriging was undertaken to create a smoothed surface of predicted vector density in the study area. Our results show that both Ae. aegypti and Ae. albopictus were present in San Jose village during the study period. However, one Aedes species was dominant in a given geographic area at a time, suggesting differing habitat preferences and interspecies competition between vectors. Density maps provide information to direct entomological control activities and advocate the development of geographically enhanced surveillance and control systems to improve DF management in the Philippines.
昆虫学监测与控制对于登革热（DF）的管理至关重要。因此，了解登革热传播媒介埃及伊蚊（Aedes (Stegomyia) aegypti (L.)）和白纹伊蚊（Ae. (Stegomyia) albopictus (Skuse)）的时空分布模式至关重要。在菲律宾，资源有限，昆虫学监测与控制通常在疫情期间开展，而此时传播难以控制。空间流行病学工具和方法的最新进展为探索更有效的登革热监测与控制解决方案提供了机会；然而，文献中来自资源匮乏地区的实例很少。本研究的目的是：（i）探索伊蚊种群的空间分布模式，以及（ii）预测媒介密度高和低的区域，为菲律宾蒙廷卢帕市圣何塞村的登革热控制提供依据。在2011年6月至11月期间，每两周从圣何塞村的50个双粘式诱蚊产卵器（SOs）收集成年雌性伊蚊。进行空间聚类分析以识别埃及伊蚊和白纹伊蚊的高密度和低密度聚类。通过检查半变异函数评估空间自相关性，并采用普通克里金法创建研究区域内预测媒介密度的平滑表面。我们研究结果表明，在研究期间，埃及伊蚊和白纹伊蚊均在圣何塞村出现。然而，在特定地理区域，一次只有一种伊蚊占主导地位，这表明不同媒介之间的栖息地偏好不同且存在种间竞争。密度图为指导昆虫学控制活动提供了信息，并提倡开发地理强化监测与控制系统，以改善菲律宾的登革热管理。
