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1.
发热伴血小板减少综合征病毒(severe fever with thrombocytopenia syndrome virus,SFTSV)是我国2009年发现的一种新型布尼亚病毒。蜱虫是其重要储存宿主及传播媒介,野生动物和家畜均存在自然感染。α/β干扰素受体基因敲除的免疫缺陷小鼠是理想的实验动物模型。本文综述了SFTSV的动物感染及动物模型的研究成果,为SFTSV自然流行的控制以及动物实验提供依据。  相似文献   
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Two species of ixodid tick, Ixodes affinis Neumann and Amblyomma maculatum Koch, are simultaneously expanding their ranges throughout the mid-Atlantic region of the US. Although we have some understanding of the ecology and life history of these species, the ecological mechanisms governing where and how new populations establish and persist are unclear. To assess population connectivity and ancestry, we sequenced a fragment of the 16S mitochondrial rRNA gene from a representative sample of individuals of both species from populations throughout the eastern US. We found that despite overlapping host preferences throughout ontogeny, each species exhibited very different genetic and geographic patterns of population establishment and connectivity. I. affinis was of two distinct mitochondrial clades, with a clear geographic break separating northern and southern populations. Both I. affinis populations showed evidence of recent expansion, although the southern population was more genetically diverse, indicating a longer history of establishment. A. maculatum exhibited diverse haplotypes that showed no significant relationship with geographic patterns and little apparent connectivity between sites. Heteroplasmy was also observed in the 16S mitochondrial rRNA gene in 3.5% of A. maculatum individuals. Genetic evidence suggests that these species rely on different key life stages to successfully disperse into novel environments, and that host vagility, habitat stability and habitat connectivity all play critical roles in the establishment of new tick populations.  相似文献   
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《Vaccine》2018,36(45):6581-6586
INCOGARR is a thematic network recently approved to be financially supported by the Ibero-American Program of Science and Technology for Development (CYTED). The objectives of this Network are the design and evaluation of an efficient and feasible anti-tick vaccine candidate from the technical and economical points of view and also sharing experiences in the immunological control of ticks as part of an Integrated Control Program. The Network consists of seven laboratories and one company from six countries. The first meeting of the Network took place with the representation of each laboratory involved. In the meeting, general and specific objectives and activities of the Network were discussed and it was a very nice example of international collaboration to address an unsolved worldwide topic on tick control in which laboratories with different competencies and expertise join their efforts in a common goal.  相似文献   
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We undertook a comparative study of the susceptibility of different tick cell lines to infection with the European subtype of tick-borne encephalitis virus (TBEV), prototype strain Neudoerfl. The growth of TBEV was investigated in lines derived from vector Ixodes ricinus L. ticks (IRE/CTVM18, 19, and 20), as well as non-vector ticks, namely Ixodes scapularis Say (IDE2), Boophilus microplus Canestrini (BME/CTVM2), Hyalomma anatolicum anatolicum Koch (HAE/CTVM9), Rhipicephalus appendiculatus Neumann (RA-257) and recently established and herein described lines from the argasid tick Ornithodoros moubata Murray (OME/CTVM21 and 22). All the tick cell lines tested were susceptible to infection by TBEV and the virus caused productive infection without any cytopathic effect. However, there was a clear difference between the TBEV growth in vector and non-vector cell lines, since I. ricinus cell lines produced 100-1000-fold higher virus yield than the non-vector cell lines. The lowest virus production was observed in O. moubata and R. appendiculatus cell lines.  相似文献   
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本文旨在探讨吉林省延边地区自然环境和动物体表蜱类分布及其消长规律,掌握其携带发热伴血小板减少综合征布尼亚病毒(Severe fever with thrombocytopenia syndrome virus,SFTSV)状况及传播病毒能力。2016年4~9月份按月采集延边州所辖8个县(市)自然环境中生长的蜱虫和放牧动物体表蜱虫进行形态学分类,对其进行构成分析。对其中部分蜱虫分组进行SFTSV核酸检测。SFTSV核酸检测方法采用了Real time RT-PCR和RT-PCR相结合的方法。结果共采集蜱虫3 446只,其中森林革蜱763只,嗜群血蜱222只,日本血蜱639只,长角血蜱515只,全沟硬蜱1 014只,其他血蜱293只;全沟硬蜱(29.43%)和森林革蜱(22.14%)为本地优势种。长角血蜱在图们市(70.88%)和珲春市(40.59%)分布较多。对部分蜱虫(1605只)SFTSV Real time RT-PCR检测结果总最低感染率为1.81%,分种最低感染率分别为嗜群血蜱8.65%、日本血蜱4.53%、长角血蜱1.59%。序列分析结果表明,本文检测到的SFTSV病毒与我国其他省份从患者身上分离到的大部分SFTSV有高度一致性(99%)且与2012年从浙江患者血清中分离到的SFTSV、2013年韩国国家疾病预防控制中心从人身上采集的长角血蜱中分离到的SFTSV处于同一分枝,把该病毒命名为YBHC-TICK1-2016/CHINA。  相似文献   
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蜱是一些人兽共患病的传播媒介和储存宿主,蜱媒传染病是虫媒传染病的重要组成部分。本文就国内外新发蜱媒传染病及其病原体研究热点进行扼要概述。  相似文献   
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John F. Andersen 《Toxicon》2010,56(7):1120-1129
The saliva of blood-feeding arthropods contains rich mixtures of ligand binding proteins targeted at inhibiting hemostasis and inflammation in the host. Since blood feeding has evolved many times, different taxonomic groups utilize completely different families of proteins to perform similar tasks. Structural studies performed on a number of these proteins have revealed biologically novel and sophisticated mechanisms used to perform their functions. Here, the results of these structural and mechanistic studies are reviewed.  相似文献   
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Tick paralysis is an acute, progressive, and potentially fatal muscle paralysis secondary to a toxin secreted by a pregnant tick during a bite. Although tick bites can occur anywhere on the body, ticks are frequently overlooked on the scalp because of overlying hair. Children with acute neurologic symptoms frequently undergo MR scanning that may incidentally reveal the offending tick. Timely identification and removal of the tick leads to rapid recovery from tick paralysis. We report the MRI findings at 1.5 T of tick paralysis with an attached tick.  相似文献   
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