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首页> 外文期刊>Journal of Medical Entomology >Ixodes ricinus density, and distribution and prevalence of Borrelia burgdorferi sensu lato infection along an altitudinal gradient
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Ixodes ricinus density, and distribution and prevalence of Borrelia burgdorferi sensu lato infection along an altitudinal gradient

机译：棉铃虫的蓖麻密度，沿垂直梯度分布的博氏疏螺旋体感染和分布

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摘要

In this study, we measured the phenology of Ixodes ricinus ticks and their infection with Borrelia burgdorferi sensu lato (sl) simultaneously along an altitudinal gradient to assess the impact of climate on the phenology of ticks and on their infection with B. burgdorferi sl. From 1999 to 2001, free-living I. ricinus ticks were collected monthly by flagging vegetation at three different altitudes (620, 740, and 900 in above sea level) on the slope of a mountain in Chaumont (Neuchatel, Switzerland). I. ricinus ticks were examined for the presence of B, burgdorferi sl by using direct fluorescent antibody assay and isolation of spirochetes. Borrelia species were characterized by polymerase chain reaction followed by restriction fragment-length polymorphism. Tick density and tick phenology varied with altitude. Although the peak tick density decreased and the onset of ticks was delayed with altitude, the phenology, vas much more stable among years at the highest altitudes than at the lowest. The prevalence of B. burgdorferi infection in nymphs and adults decreased with altitude. The prevalence of infection differed significantly among years, and it was significantly higher in adults (30%) than in nymphs (21%). B. burgdorferi infection in adults was positively related with adult density, but this was not observed for nymphs. Five B. burgdorferi sl genospecies were successfully : B. garinii, B. burgdorferi sensu stricto, B. afzelii, B. valaisiana, and B. lusitaniae. Mixed isolate infections were obtained from five of 140 infected ticks. The greatest diversity in Borrelia species was observed at the lowest altitude where all five Borrelia species were present, whereas at the two highest altitudes, B. lusitaniae was not observed.
机译：在这项研究中，我们同时沿高度梯度测量了蓖麻短tick的物候和它们对伯氏疏螺旋体的感染，以评估气候对of的物候及其对伯氏疏螺旋体的感染的影响。从1999年到2001年，通过在Chaumont（瑞士纳沙泰尔）的一座山坡上的三个不同高度（海拔620、740和900）上标记植物的生长，每月采集蓖麻的I虫。通过使用直接荧光抗体测定和螺旋体的分离来检查蓖麻I.ricinus壁虱中B，burgdorferi sl的存在。通过聚合酶链反应，然后限制片段长度多态性来表征伯氏疏螺旋体。 ick密度和tick物候随海拔变化。尽管峰值tick密度降低并且s的发作随海拔高度而延迟，但物候系的变化在海拔最高的年份比最低的年份更稳定。若虫和成年人中B. burgdorferi感染的患病率随海拔降低而降低。几年之间，感染的流行率存在显着差异，并且成年人（30％）显着高于若虫（21％）。成人的B. burgdorferi感染与成人密度呈正相关，但若虫未发现。五个B. burgdorferi sl基因型已成功获得：B。garinii，B。burgdorferi sensu stricto，B。afzelii，B。valaisiana和B. lusitaniae。从140个受感染的tick中获得了5个混合分离株感染。在存在所有五种疏螺旋体的最低海拔处观察到了疏螺旋体物种的最大多样性，而在两个最高海拔处未观察到褐藻双歧杆菌。

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