Programa de Computação Científica-Fiocruz, Instituto Oswaldo Cruz-Fiocruz, 21045-900 Rio de Janeiro, Brasil.
Mem Inst Oswaldo Cruz. 2009 Jul;104(4):614-20. doi: 10.1590/s0074-02762009000400014.
Roraima is the northernmost state of Brazil, bordering both Venezuela and Guyana. Appropriate climate and vector conditions for dengue transmission together with its proximity to countries where all four dengue serotypes circulate make this state, particularly the capital Boa Vista, strategically important for dengue surveillance in Brazil. Nonetheless, few studies have addressed the population dynamics of Aedes aegypti in Boa Vista. In this study, we report temporal and spatial variations in Ae. aegypti population density using ovitraps in two highly populated neighbourhoods; Centro and Tancredo Neves. In three out of six surveys, Ae. aegypti was present in more than 80% of the sites visited. High presence levels of this mosquito suggest ubiquitous human exposure to the vector, at least during part of the year. The highest infestation rates occurred during the peak of the rainy seasons, but a large presence was also observed during the early dry season (although with more variation among years). Spatial distribution of positive houses changed from a sparse and local pattern to a very dense pattern during the dry-wet season transition. These results suggest that the risk of dengue transmission and the potential for the new serotype invasions are high for most of the year.
罗赖马州是巴西最北部的州，与委内瑞拉和圭亚那接壤。登革热传播的适宜气候和病媒条件，以及与所有四个登革热血清型流行的国家接壤，使该州特别是首府博阿维斯塔成为巴西登革热监测的战略要地。然而，很少有研究涉及博阿维斯塔埃及伊蚊的种群动态。在这项研究中，我们使用诱卵器报告了两个人口稠密的社区（Centro 和 Tancredo Neves）中埃及伊蚊种群密度的时间和空间变化。在六次调查中的三次中，在访问的 80%以上的地点发现了埃及伊蚊。这种蚊子的高存在水平表明，至少在一年中的部分时间，人类普遍接触到这种病媒。最高的感染率发生在雨季高峰期，但在旱季早期也观察到大量存在（尽管各年之间的变化较大）。在干湿季过渡期间，阳性房屋的空间分布从稀疏和局部模式转变为非常密集的模式。这些结果表明，大多数时候登革热传播的风险和新血清型入侵的可能性都很高。
