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首页> 外文学位 >The ecological and evolutionary relationships of ticks and the bacterial pathogens they transmit: With special emphasis on ticks in the Ixodes ricinus group and the bacterium Anaplasma phagocytophilum.
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The ecological and evolutionary relationships of ticks and the bacterial pathogens they transmit: With special emphasis on ticks in the Ixodes ricinus group and the bacterium Anaplasma phagocytophilum.

机译：s与transmit传播的细菌病原体之间的生态和进化关系：特别强调x虱（Ixodes ricinus）组和嗜食性无浆细胞（Anaplasma phagocytophilum）中的tick。

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摘要

This dissertation consists of three chapters, each dealing with a different aspect of the ecology of tick borne disease. The first chapter investigates the molecular ecology of the argasid tick, Ornithodoros coriaceus (Koch), the only confirmed vector of epizootic bovine abortion (EBA) in the United States. While the disease and its vector have historically been reported in the mountainous regions of California, within the past two decades the range of EBA has apparently expanded into southern Oregon and northern Nevada. Overall, very little evidence of gene flow among tick populations was detected, making it unlikely that widespread tick movement had introduced O. coriaceus and the EBA agent into new regions. The second chapter describes the ecology of tick borne disease in Guatemalan horses and cattle. Data on host condition and tick infestation were recorded for each animal in the study. The seroprevalence of important tick-borne pathogens including Babesia spp. and Anaplasma spp. were determined and the first report of A. phagocytophilum infection from this region was made. The prevalence of infection, tick infestation levels, host factors and environmental data were analyzed for association. The third chapter describes a study investigating whether the transmissibility of Anaplasma phagocytophilum strains is influenced by the geographic origin of its tick vector. We tested our hypothesis by performing a reciprocal cross-transmission experiment using an eastern and a western North American strain of A. phagocytophilum (Webster and MRK, respectively) and the two tick species, I. scapularis and I. pacificus , which serve as the bacterial strain's natural vectors respectively. The western tick, I. pacificus, showed a significantly higher vector competence for A. phagocytophilum than I. scapularis and the eastern strain, Webster, was more transmissible than its western counterpart, MRK. These results indicate that geographic variation in host susceptibility to A. phagocytophilum strains may play a more important role in the epidemiology of granulocytic anaplasmosis than does the competence of its tick vectors to transmit the pathogen.
机译：本文共分三章，分别涉及with传播疾病生态学的不同方面。第一章研究了美国唯一确认的流行性牛流产（EBA）的杀虫剂tick鸟（Ornithodoros coriaceus（Koch））的分子生态学。尽管该病及其病原体在加利福尼亚山区曾有过报道，但在过去的二十年中，EBA的范围显然已经扩展到俄勒冈州南部和内华达州北部。总体而言，几乎没有发现tick虫基因流的证据，这使得widespread虫运动和EBA病原体无法广泛传播到新地区。第二章介绍了危地马拉马和牛of传播疾病的生态学。记录研究中每只动物的宿主状况和tick虫侵扰数据。重要壁虱传播的病原体（包括巴贝斯虫属）的血清阳性率。和无花果属进行了测定，并首次报告了来自该地区的嗜A.phagocytophilum感染。分析感染的发生率，tick虫侵袭水平，宿主因素和环境数据以进行关联。第三章描述了一项研究，旨在研究吞噬嗜浆细胞菌株的可传递性是否受其滴答载体地理来源的影响。我们通过使用美国东部和西部北美噬菌体菌株（分别为Webster和MRK）以及两个壁虱物种scapularis和I. pacific进行相互交叉传输实验来检验我们的假设。细菌菌株的天然载体。西部壁虱I. pacificus表现出的吞噬嗜酸曲霉载体能力明显高于肩capI。噬菌体，而东部品系Webster的传播能力要比西部MRK更高。这些结果表明，宿主对吞噬嗜酸曲霉菌株的敏感性的地理变异可能比粒细胞载体传播病原体的能力在粒细胞无性病的流行病学中起着更重要的作用。

著录项

  • 作者

    Teglas, Mike Bela.;

  • 作者单位

    University of California, Davis.;

  • 授予单位 University of California, Davis.;
  • 学科 Biology Veterinary Science.; Biology Entomology.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 81 p.
  • 总页数 81
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 动物学;昆虫学;
  • 关键词

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