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首页> 外文期刊>Journal of Medical Entomology >Life stage-related differences in density of questing ticks and infection with Borrelia burgdorferi sensu lato within a single cohort of Ixodes pacificus (Acari: Ixodidae)
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Life stage-related differences in density of questing ticks and infection with Borrelia burgdorferi sensu lato within a single cohort of Ixodes pacificus (Acari: Ixodidae)

机译：与生命周期相关的单个种群的凤蝶（Bostarlia burgdorferi sensu lato）的tick虫密度和感染的生命差异（Acari：Ixodidae）

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摘要

The primary aims of this study were to quantify the density of Ixodes pacificus Cooley and Kohls nymphs and adults of the same generational cohort collected within a single year in six oak or madrone leaf litter habitats and to compare the prevalence of infection with Borrelia burgdorferi sensu lato (s.l.) in adults originating from nymphal cohorts with a low (<1%) versus high (>10%) infection prevalence. Because adult densities were very low both in and adjacent to several sites, direct comparisons of infection prevalence between nymphs and adults were possible only for two sites. Mean density in these sites decreased from 11.95/100 m2 for nymphs to 0/100 m2 for adults in leaf litter, and infection prevalence with B. burgdorferi s.l. was four-fold higher in nymphs (7.4%) versus adults (1.6%) of the same generational cohort collected in ecotones bordering the leaf litter areas. Assuming a density of adults in leaf litter of 0.04/100 m2 (mean for all six examined sites) and an infection prevalence similar to that found in adults collected from litter ecotones, the risk of encountering infected ticks in leaf litter decreased >1,000-fold from the nymphal to adult stage. Regardless of site-specific infection prevalence in the nymphal stage (n = 2 sites; 0.7 versus 14%), the infection prevalence for the adults of the same generational cohort was similarly low (1.5-1.6%). Peak densities of adult I. pacificus were 0-0.1/100 m2 in leaf litter, 0-6.5/100 m2 in ecotonal grasslands, and 2.0-39.0/100 m2 in ecotonal chaparral. Despite more intensive sampling efforts in leaf litter, the vast majority of the 282 adults collected came from grass or chaparral ecotones (98.9%, n = 279) rather than leaf litter (1.1%, n = 3). The study yielded eight B. burgdorferi s.l.-infected adults; four of these carried B. burgdorferi sensu stricto Johnson, Schmidt, Hyde, Steigerwalt, and Brenner, and the remaining four were infected with currently undescribed B. burgdorferi s.l. spirochetes. This is the first study comparing both density of I. pacificus nymphs and adults and prevalence of infection with B. burdorferi s.l in these ticks within the same generational cohort and sampling area.
机译：这项研究的主要目的是量化在一年内在六个橡树或马德隆叶子凋落物栖息地中采集的太平洋象尾虫和科尔斯若虫以及同一世代队列的成虫的密度，并比较博氏疏螺旋体感染的流行程度。 （sl）来自若虫种群的成年人（感染率低（<1％）对高（> 10％））。由于在几个地点及其附近的成虫密度都非常低，因此，只有两个地点才有可能直接比较若虫和成虫之间的感染率。这些部位的平均密度从若虫的11.95 / 100 m2（若虫）降至成虫的0/100 m2（成虫），并且感染了B. burgdorferi s.l.。若虫在与凋落物边缘接壤的过渡带中收集的同一代代，若虫（7.4％）比成年（1.6％）高四倍。假设叶子凋落物中成虫的密度为0.04 / 100 m2（在所有六个检测部位中均值），且感染率与从凋落物过渡带收集的成虫相似，则在叶子凋落物中遇到被感染的s的风险降低了> 1,000倍从若虫到成年阶段。不管在若虫阶段特定部位的感染流行率（n = 2个部位; 0.7对14％），同一世代队列的成年人的感染率同样较低（1.5-1.6％）。成年太平洋成虫的峰值密度在落叶中为0-0.1 / 100 m2，在生态草原上为0-6.5 / 100 m2，在生态群落中为2.0-39.0 / 100 m2。尽管对叶子凋落物进行了更深入的采样工作，但收集的282位成年成年人中，绝大多数来自草丛或丛林交错带（98.9％，n = 279），而不是叶子凋落物（1.1％，n = 3）。该研究产生了八名感染伯氏疏螺旋体的成年人。这些中的四个携带了B. burgdorferi sensu stricto Johnson，Schmidt，Hyde，Steigerwalt和Brenner，其余四个则被目前未描述的B. burgdorferi s.l.感染。螺旋形。这是首次比较同一世代队列和采样区域中这些虱子中I. pacificus若虫和成虫的密度以及B. burdorferi s.l感染的患病率。

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