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通过调查我国已有的4种蜱伯氏疏螺旋体的感染情况,以进一步阐明莱姆病在中国的分布与流行状况。本研究通过筛选扩增伯氏疏螺旋体外膜蛋白A(OspA)基因片段的通用引物,获得1对特异性引物,优化反应条件后建立用于检测蜱体内伯氏疏螺旋体的PCR方法,其扩增片段大小为307 bp。该方法可检测出10 pg的阿氏疏螺旋体(Ba)、1 pg的伽氏疏螺旋体(Bg)和0.01 pg的狭义伯氏疏螺旋体(Bb)的3种不同基因型的伯氏疏螺旋体的OspA基因组DNA,表明其敏感性较好,适用于蜱感染伯氏疏螺旋体状况的调查。本研究从我国7个省采集到的667只蜱,进行伯氏疏螺旋体感染的流行病学调查,分类鉴定表明这些蜱分属革蜱属、血蜱属、牛蜱属和扇头蜱属。PCR检测所获数据表明它们的感染率分别为4%(10/264)、6%(11/137)、31.4%(59/185)和31% 相似文献
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《中国兽医学报》2017,(11):2151-2155
为了解吉林省四平市周边地区伯氏疏螺旋体流行情况,本试验于2017年5-7月分别采集四平市周边地区蜱虫样品共25份。通过筛选扩增伯氏疏螺旋体外膜蛋白C(OspC)基因片段的通用引物、优化反应条件后建立用于检测蜱体内伯氏疏螺旋体的PCR方法。从25份样品中分离到8份阳性样品(阳性率约为32%),经过测序比对发现其基因型均为Borrelia burgdorferi;并以分离到的Borrelia burgdorferi DNA为模板,PCR扩增OspC基因,构建重组质粒pET-30a-OspC,以IPTG诱导蛋白表达,为建立伯氏疏螺旋体ELISA检测方法奠定了基础。 相似文献
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《中国兽医学报》2020,(9)
为了解四川省石渠县牦牛体表寄生蜱携带无形体与疏螺旋体的种类和感染情况。采集牦牛体表寄生蜱,经形态学和分子生物学鉴定,确定蜱种类。再采用巢式PCR分别扩增无形体科16S rRNA基因和疏螺旋体属的16S rRNA与flaB基因片段,并对阳性产物进行测序、比对和系统进化树构建,从而确定无形体和疏螺旋体的种类。结果显示,共采集到818只蜱,其中西藏革蜱占78.97%(646/818)、青海血蜱占21.03%(172/818)。所有蜱中有132只检出无形体,阳性率为16.14%;8只检出疏螺旋体,阳性率为0.98%;3只蜱混合感染牛无形体和疏螺旋体。经进一步分析,仅在青海血蜱中检测到牛无形体(Anaplasma bovis)、埃立克体(Ehrlichia)和疏螺旋体(Borrelia),其阳性率分别为6.98%(12/172),2.33%(4/172)和4.65%(8/172);仅在西藏革蜱中检测到绵羊无形体(Anaplasma ovis),其阳性率为17.96%(116/646)。此外,获得的疏螺旋体16S rRNA和flaB基因序列均与分离自日本大刺血蜱中的Borrelia sp.HM菌株亲缘关系最近。结果提示,四川石渠县存在牛无形体、绵羊无形体、埃立克体未定种以及疏螺旋体未定种,存在感染人的风险。 相似文献
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为了对陕西省和辽宁省部分地区羊源蜱类及其携带病原体的流行情况进行分析,本试验采集了288份羊源蜱样本,采用形态学观察鉴定蜱种;采用分子生物学方法扩增巴贝斯虫18S rRNA、伯氏疏螺旋体16S rRNA、斑点热群立克次体ompA和无形体16S rRNA的基因序列,并结合核苷酸序列分析,确定所收集蜱样本中各类病原体的流行情况。结果显示,经鉴定288份羊源蜱样本均为长角血蜱。陕西省144份长角血蜱中携带巴贝斯虫、斑点热群立克次体和无形体,感染率分别为0.69%、21.53%和77.78%,且巴贝斯虫和斑点热群立克次体均与无形体复合感染;其中长角血蜱中携带Babesia microti、Candidatus Rickettsia longicornis、Uncultured Rickettsia sp. QH-122、Rickettsia endosymbiont of Haemaphysalis longicornis、Uncultured Anaplasma sp. ZJ06/2009、Anaplasma marginale、Anaplasma capra共7种病原体。辽宁省144份长角... 相似文献
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吴雅玲 《青海畜牧兽医杂志》2004,34(1):41-43
莱姆病(Lyme disease，LD)是20世纪70年代发现的一种以蜱作传播媒介，由伯氏疏螺旋体(Borrelia burgdorfere，Bb)感染所致的人畜共患传染病。 相似文献
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本研究旨在阐明长角血蜱与嗜群血蜱间的亲缘关系.采用聚合酶链式反应(PCR)技术从长角血蜱和嗜群血蜱基因组DNA中扩增得到核糖体第二内部转录间隔区基因(ITS-2)片段、线粒体细胞色素氧化酶亚基Ⅰ基因(COI)片段和线粒体细胞色素氧化酶亚基Ⅱ基因(COⅡ)片段,并进行测序,进而分析其基因变异与系统发育.结果表明,长角血蜱和嗜群血蜱的ITS-2、COⅠ和COⅡ基因片段的大小存在差异,长角血蜱3种基因分别为361、479和647 bp,嗜群血蜱基因分别为354、474和661 bp.长角血蜱与嗜群血蜱间ITS-2、COⅠ和COⅡ基因的相似性分别为84.2%、89.0%和88.4%.以3种基因构建的NJ进化树中,长角血蜱和嗜群血蜱均聚类.因此,认为长角血蜱和嗜群血蜱间ITS-2、COⅠ和COⅡ基因间变异较小,它们是血蜱属中亲缘关系较近的2个有效种,支持传统形态学的分类地位. 相似文献
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《畜牧兽医学报》2010,(6)
本研究旨在阐明长角血蜱与嗜群血蜱间的亲缘关系。采用聚合酶链式反应(PCR)技术从长角血蜱和嗜群血蜱基因组DNA中扩增得到核糖体第二内部转录间隔区基因(ITS-2)片段、线粒体细胞色素氧化酶亚基Ⅰ基因(COⅠ)片段和线粒体细胞色素氧化酶亚基II基因(COⅡ)片段,并进行测序,进而分析其基因变异与系统发育。结果表明,长角血蜱和嗜群血蜱的ITS-2、COⅠ和COⅡ基因片段的大小存在差异,长角血蜱3种基因分别为361、479和647bp,嗜群血蜱基因分别为354、474和661bp。长角血蜱与嗜群血蜱间ITS-2、COⅠ和COⅡ基因的相似性分别为84.2%、89.0%和88.4%。以3种基因构建的NJ进化树中,长角血蜱和嗜群血蜱均聚类。因此,认为长角血蜱和嗜群血蜱间ITS-2、COI和COII基因间变异较小,它们是血蜱属中亲缘关系较近的2个有效种,支持传统形态学的分类地位。 相似文献
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Beyond Lyme: aetiology of tick-borne human diseases with emphasis on the south-eastern United States
Since its emergence in the north-eastern and upper mid-western United States in the 1970s, Lyme disease, caused by Borrelia burgdorferi, has captured the public's attention as the nation's most prevalent vector-borne zoonotic disease. In contrast, recent publications on tick-pathogen systems in the eastern United States, and findings from Department of Defense investigations of ticks found biting military personnel, indicate that residents of the south-eastern United States are primarily at risk from emerging diseases caused by tick-borne pathogens other than B.?burgdorferi. The risk of contracting these diseases varies greatly among states as a consequence of regional variation in the abundance of the key vector tick species. Moreover, this risk is changing, because tick distributions are in flux. To improve health outcomes, health providers need better information and awareness regarding which tick species bite humans in each state and which zoonotic pathogens are prevalent in these ticks. Effective diagnosis, treatment, control and reporting of tick-borne disease in the south-eastern United States require that health providers think 'beyond Lyme' and consider the marked regional differences in the tick species that bite humans and in the pathogens that these ticks carry. 相似文献
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Ticks transmit pathogens that cause diseases which greatly impact both human and animal health. Vaccines developed against Boophilus spp. using Bm86 and Bm95 tick gut antigens demonstrated the feasibility of using vaccines for control of tick infestations. These vaccines also reduced transmission of tick-borne pathogens by decreasing exposure of susceptible hosts to ticks. The recently discovered tick antigens, 64P putative cement protein and subolesin involved in the regulation of tick feeding and reproduction, were also shown to reduce tick infestations. These antigens, together with the TROSPA receptor for Burrelia burgdorferi OspA were effective against tick-borne pathogens by reducing the infection levels in ticks and/or the transmission of the pathogen. Development of a vaccine targeted at both the tick vector and pathogen would contribute greatly to the control of tick infestations and the transmission of tick-borne diseases. These results have demonstrated that tick vaccines can be developed for control tick infestations and show promise for the prevention of the transmission of tick-borne pathogens. 相似文献
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荧光定量PCR检测硬蜱体内莱姆病螺旋体的研究 总被引：1，自引：1，他引：0
为建立一个荧光定量PCR检测硬蜱体内莱姆病螺旋体的方法,根据GenBank登录的莱姆病螺旋体鞭毛蛋白FlaB序列,应用生物学软件进行序列比对,在保守的C段区设计与筛选特异引物和TaqMan探针。对荧光定量PCR反应体系与条件进行优化,验证方法的特异性、敏感性,并通过对感染螺旋体的蜱样本的检测,评价该方法的实用价值。结果显示,自然感染莱姆病螺旋体的35份蜱标本检测阳性符合率100%,正常蜱20份标本的检测结果均为阴性。该方法对牛巴贝斯原虫、泰勒原虫、边缘无浆体、金龟子绿僵菌、大肠杆菌等蜱体常见病原微生物所抽提的DNA的检测均呈阴性。荧光定量PCR方法检测质粒的灵敏度可达1×102拷贝/μL。TaqMan荧光定量PCR方法检测硬蜱体内莱姆病螺旋体具有较好的敏感性和特异性,可适于莱姆病的流行病学调查和监控。 相似文献
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Ortuño A Castellà J Marco I Ruiz M Lavín S 《Journal of veterinary medicine. B, Infectious diseases and veterinary public health》2003,50(5):253-254
Ungulates are involved in the epidemiology of Borreliosis as maintenance hosts for vector tick species. We evaluated the prevalence of antibodies to Borrelia burgdorferi sensu lato in two different populations of southern chamois in Spain. Forty-six sera (40.4%) were positive at titres >/=1 : 64 using an indirect immunofluorescence assay (IFAT). 相似文献
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McCall JW Baker CF Mather TN Chester ST McCall SD Irwin JP Young SL Cramer LG Pollmeier MG 《Veterinary parasitology》2011,179(4):335-342
Healthy, purpose-bred laboratory beagle dogs that had not been exposed to ticks and were seronegative for Borrelia burgdorferi and Anaplasma phagocytophilum were randomly assigned to four groups of eight dogs each. Control group 1 was not treated. Groups 2, 3 and 4 were treated with a single topical application of a new formulation of fipronil, amitraz and (S)-methoprene (CERTIFECT?, Merial Limited, GA, USA) at 28, 21 or 14 days prior to tick infestation, respectively. Each dog was infested with 25 female and 25 male field-collected adult Ixodes scapularis ticks that had infection rates of 66% for B. burgdorferi sensu stricto and 23% for A. phagocytophilum, as determined by polymerase chain reaction. Two and five days after tick infestation, control dogs had an average of 9.5 and 13.9 attached adult female ticks, respectively, whilst the 24 treated dogs remained tick-free aside from a single tick on the 2nd day after infestation. Serial serological tests demonstrated that the ticks successfully infected 8/8 control dogs with B. burgdorferi and co-infected 6/8 with A. phagocytophilum. B. burgdorferi infection also was confirmed in most control dogs by culture (6/8) and PCR (7/8) of skin biopsies. In contrast, CERTIFECT protected all 24 treated dogs against infection by both B. burgdorferi and A. phagocytophilum, as demonstrated by their negative serological tests throughout the study and the absence of any positive skin biopsy culture or PCR in these dogs. 相似文献
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Hinrichsen VL Whitworth UG Breitschwerdt EB Hegarty BC Mather TN 《Journal of the American Veterinary Medical Association》2001,218(7):1092-1097
OBJECTIVE: To determine whether the geographic distribution of deer ticks (Ixodes scapularis) was associated with the distribution of dogs seropositive for various tick-transmitted disease organisms (ie, Borrelia burgdorferi, Rickettsia rickettsii, the human granulocytic ehrlichiosis [HGE] agent, Ehrlichia canis, and Bartonella vinsonii subsp berkhoffii). DESIGN: Serologic survey. SAMPLE POPULATION: Serum samples from 277 dogs in animal shelters and veterinary hospitals in Rhode Island. RESULTS: Overall, 143 (52%) dogs were seropositive for B burgdorferi, 59 (21.3%) were seropositive for R rickettsii, 40 (14.4%) were seropositive for the HGE agent, 8 (2.9%) were seropositive for E canis, and 6 (2.2%) were seropositive for B vinsonii. Regression analysis indicated that the natural logarithm of nymphal deer tick abundance was correlated with rate of seropositivity to the HGE agent and to B burgdorferi but not to rate of seropositivity to R rickettsii, E canis, or B vinsonii. Percentages of samples seropositive for B burgdorferi, R rickettsii, the HGE agent, and E canis were significantly higher for samples from the southwestern part of the state where ticks in general and deer ticks in particular are abundant than for samples from the northern and eastern portions of the state, where ticks are relatively rare. CONCLUSIONS AND CLINICAL RELEVANCE: Results suggested that all 5 disease agents are in Rhode Island and pose a risk to dogs and humans. Knowledge concerning tick distributions may be useful in predicting the pattern of disease associated with particular tick species and may aid diagnostic, prevention, and control efforts. 相似文献
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Smith FD Ballantyne R Morgan ER Wall R 《Comparative immunology, microbiology and infectious diseases》2012,35(2):163-167
The reported number of cases of Lyme disease, Borrelia burgdorferi sensu lato, is thought to have increased in the UK over the past decade, but consistent surveillance data are lacking. Here the prevalence of B. burgdorferi in ticks attached to pet dogs was examined - using them as sentinels for human disease risk. Dogs give a good indication of the exposure of their human owners to infected ticks, since they largely share the same environment and visit the same outdoor areas. PCR was used to test 739 tick samples collected from 3534 dogs selected at random as they visited veterinary practices over a period of six months. Overall, the prevalence of infected ticks on all dogs was 0.5% giving an estimated 481 infected ticks per 100,000 dogs. The data suggest that the prevalence of Borrelia in the UK tick population is considerably higher than most recent estimates indicate. 相似文献
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This review discusses the literature on B. burgdorferi infections in view of the rising incidence of this infection in general and the increasing concerns of horse owners and equine practitioners. Lyme disease, the clinical expression of Borrelia infections in man is an important health problem. The geographic distribution of B. burgdorferi infections in equidae should resemble that of human cases because the vector tick involved, Ixodes ricinus, feeds on both species and, indeed, the infection has been established many times in horses. However, a definite diagnosis of the disease "Lyme borreliosis" in human beings as well as in horses and other animals is often difficult to accomplish. Although a broad spectrum of clinical signs has been attributed to B. burgdorferi infections in horses, indisputable cases of equine Lyme borreliosis are extremely rare so far, if they exist at all. 相似文献
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Summary This review discusses the literature on B. burgdorferi infections in view of the rising incidence of this infection in general and the increasing concerns of horse owners and equine practitioners. Lyme disease, the clinical expression of Borrelia infections in man is an important health problem. The geographic distribution of B. burgdorferi infections in equidae should resemble that of human cases because the vector tick involved, Ixodes ricinus, feeds on both species and, indeed, the infection has been established many times in horses. However, a definite diagnosis of the disease "Lyme borreliosis" in human beings as well as in horses and other animals is often difficult to accomplish. Although a broad spectrum of clinical signs has been attributed to B. burgdorferi infections in horses, indisputable cases of equine Lyme borreliosis are extremely rare so far, if they exist at all. 相似文献
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Foley JE Queen EV Sacks B Foley P 《Comparative immunology, microbiology and infectious diseases》2005,28(3):197-212
Ixodes pacificus is the main tick vector for transmission of Anaplasma phagocytophilum and Borrelia burgdorferi to large vertebrates in California. The present study was undertaken in I. pacificus-infested counties in California to examine spatial and temporal relationships among A. phagocytophilum and B. burgdorferi-exposed coyotes with vegetation type and climate. The overall A. phagocytophilum and B. burgdorferi seroprevalences were 39.5% (N=215) and 18.9% (N=148), respectively, with no association with sex. PCR for A. phagocytophilum and B. burgdorferi was negative in all blood and kidney samples. Increased seroprevalence was a positive function of rainfall. Ehrlichial seropositivity was increased in blue-oak foothill pine, montane hardwood, and redwood vegetation regions, and decreased in coastal sagebrush and cropland. Increased exposure to B. burgdorferi occurred in blue oak woodland. 相似文献