Bang Y H, Bown D N, Onwubiko A O
Bull World Health Organ. 1981;59(1):107-14.
The seasonal variation in prevalence of Aedes (Stegomyia) mosquitos breeding in peridomestic water containers was assessed in an urban quarter of Enugu, Nigeria, and in two rural villages located among forest relicts in the neighbouring Udi Hills. A large number of earthenware pots, most of which contained water in the wet season, were present in the compounds around houses. Monthly determinations of the presence or absence of Aedes larvae in these containers were made for 13 consecutive months. The average Breteau index (positive containers per 100 houses) for A. aegypti during the 7-month wet season was 53 in one of the villages and 76 in the other, suggesting a high risk of yellow fever transmission; the dry-season averages were 11 and 23. In the urban quarter the wet-season average was 29; the dry-season average was 4.7, a level at which transmission is unlikely to occur. A. luteocephalus were occasionally found in containers in both the urban and rural localities, and A. africanus larvae occurred in one of the villages. Although Culex larvae were common, mixed infestations of Aedes and Culex were so uncommon that the simplified "single larva" method of sampling for Aedes gave similar results to the conventional method. The multiplicity of peridomestic containers in this part of Nigeria made the container index inadequate as a measure of larval density.
在尼日利亚埃努古的一个城市街区以及邻近乌迪山森林遗迹中的两个乡村，对在住宅周围水体容器中繁殖的伊蚊（埃及伊蚊亚属）的季节性流行情况进行了评估。房屋周围的院子里有大量陶罐，其中大部分在雨季时盛有水。连续13个月每月对这些容器中是否存在伊蚊幼虫进行测定。在其中一个村庄，埃及伊蚊在7个月雨季期间的平均布雷图指数（每100户阳性容器数）为53，另一个村庄为76，这表明黄热病传播风险很高；旱季的平均值分别为11和23。在城市街区，雨季平均值为29；旱季平均值为4.7，这一水平不太可能发生传播。在城市和农村地区的容器中偶尔能发现黄头伊蚊，在其中一个村庄还出现了非洲伊蚊幼虫。尽管库蚊幼虫很常见，但伊蚊和库蚊的混合感染非常罕见，以至于用于伊蚊采样的简化“单幼虫”方法与传统方法的结果相似。尼日利亚这一地区住宅周围容器的多样性使得容器指数不足以作为幼虫密度的衡量指标。
