Laboratoire d'Entomologie Médicale, Institut Pasteur de Madagascar, Antananarivo, Madagascar.
J Med Entomol. 2013 May;50(3):603-10. doi: 10.1603/me12069.
There were epidemic-epizootics of Rift Valley Fever (RVF) affecting humans and cattle in Madagascar in the district of Anjozorobe in 2008. Little is known about the role of Malagasy mosquitoes in the circulation of RVF virus. Therefore, we investigated the species diversity, dynamics and biology of potential RVF virus vectors in the rainforest, rainforest edge (village of Anorana), and savanna biotope (village of Antanifotsy) of this district between November 2008 and July 2010. We captured 56,605 adults of 35 different species. Anopheles squamosus (Theobald), Anopheles coustani (Laveran), Culex antennatus (Becker), Culex pipiens (L.), and Culex univittatus (Theobald) were the most abundant during the rainy season with Cx. pipiens the most abundant species in the rainforest (47%), and An. squamosus the most abundant species in the rainforest edge and in the savanna biotope (56%, 60%, respectively). Only Cx. univittatus was abundant in the dry season. The parous rate was > 60% throughout the rainy season for An. squamosus and it was > 50% from the middle to the end of the rainy season for Cx. pipiens. Two additional species have been found only at larval stage. Cattle were the most attractive bait for all species, followed by sheep and poultry. Human was the least attractive for all species. Most of the 163 bloodmeals tested were taken from cattle. Three were from poultry, one was from dog and one was a mixed bloodmeal taken from sheep and cattle. These results on vectorial capacity parameters may allow considering the involvement of mosquito transmission of the virus in the district of Anjozorobe during the recent epidemic-epizootic.
2008 年，马达加斯加安焦佐罗贝地区发生了裂谷热（RVF）的人间和牛间流行疫情。有关马达加斯加水蚊在 RVF 病毒循环中的作用知之甚少。因此，我们于 2008 年 11 月至 2010 年 7 月期间，调查了该地区雨林、雨林边缘（阿诺拉纳村）和热带稀树草原生境（安坦福齐村）中 RVF 病毒潜在媒介的物种多样性、动态和生物学特性。我们捕获了 35 个不同物种的 56605 只成蚊。在雨季，数量最多的是疟蚊属（Theobald）、库蚊属（Laveran）、库蚊属（Becker）、致倦库蚊（L.）和白纹伊蚊（Theobald），其中致倦库蚊在雨林中最为常见（47%），疟蚊属在雨林边缘和热带稀树草原生境中最为常见（56%、60%）。只有白纹伊蚊在旱季数量较多。在整个雨季，疟蚊的产仔率>60%，而致倦库蚊在雨季中期到末期的产仔率>50%。仅在幼虫期发现另外两个种。所有蚊种对牛的吸引力最大，其次是绵羊和家禽，而对人的吸引力最小。在测试的 163 个血餐中，大部分来自牛，3 个来自家禽，1 个来自狗，1 个来自绵羊和牛的混合血餐。这些关于媒介传播能力参数的结果可能表明，在最近的流行疫情期间，病毒可能通过蚊传播而在安焦佐罗贝地区传播。
