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1.
从包含伪狂犬病病毒(PRV)闽A株BamHI-7片段的重组质粒pPR128中分离出含有完整糖蛋白gp50基因的2.1kbDNA片段,用KpnI和StuI酶切后,将其酶切片段分别克隆到pUC19载体中,构建了2.1kb片段完整测序用质粒。对其序列进行分析,发现与文献报道结果一致,证明分离的gp50基因是正确的。将包含gp50基因的2.1kb和1.6kbDNA片段分别插入带有痘苗病毒天坛株TK基因区段的pGJP-5质粒P7.5启动子的下游,构建了pGBT50-36和pGBT50-S22个嵌合载体。将嵌合载体通过磷酸钙共沉淀法转染预先感染TK+痘苗病毒天坛株的人TK-143细胞或CV-1细胞,进行体内同源重组。经蚀斑纯化,在BdUR选择压力下,通过光敏生物素标记的探针杂交,获得带有PRVgp50基因的重组痘苗病毒。用ELISA检测,重组痘苗病毒有特异性PRVgp50抗原存在。  相似文献   

2.
根据已发表的基因序列设计了1对PCR引物,以伪狂犬病病毒Ea株(pseudorabies virus Ea,PRv Ea)基因组DNA为模板.扩增出一大小为511bp的片段。通过酶切和测序证实,该基因为伪狂犬病病毒Ea株的又一糖蛋白基因,即gL基因。Blast软件分析表明,该基因与Kaplan株核苷酸序列的同源性为94%,氨基酸序列的同源性为95%。将测序结果输入GenBank,获得登录号AF448456。  相似文献   

3.
PRV特异性糖蛋白gp50基因片段的克隆探针制备   总被引:1,自引:0,他引:1  
在BHK21细胞中增殖伪狂犬病病毒(PRV),提纯PRVDNA,选编码特异性糖蛋白gp50基因中的262bp片段进行PCR扩增。扩增产物经KpnⅠ和SalⅠ双酶切后,将222bp片段与质粒pUC19连接构成重组子pUP。通过转化大肠杆菌JM83、Ampr和α互补效应筛选后,扩增、提纯重组子pUP,用KpnⅠ和SalⅠ酶切,电泳回收克隆的222bp片段。用光敏生物素标记222bp片段和重组子pUP制备的探针,分别检出46.8pg和93.6pg的PRVDNA,且pUP探针只与PRV呈杂交阳性反应,与HSV-1、HSV-2及CMV呈阴性反应。  相似文献   

4.
根据编码猪伪狂犬病病毒gE基因保守序列,设计合成一对引物,通过优化PCR反应条件,成功地从猪伪狂犬病病毒感染的细胞中扩增出预期的178bp片段,而猪繁殖与呼吸综合征病毒、猪细小病毒、猪瘟病毒、猪流感病毒和猪伪狂犬病病毒gE基因缺失株均未扩增出相应的片段,经PCR扩增产物测序鉴定,证实了该扩增片段为预期目的片段;敏感性试验表明,该体系可检测到10^2TCID50的猪伪狂犬病病毒。本方法的建立能够区分基因缺失疫苗免疫猪和野毒感染猪,使猪伪狂犬病病毒的检测更为快速、准确。  相似文献   

5.
根据编码猪伪狂犬病病毒gE基因保守序列,设计合成一对引物,通过优化PCR反应条件,成功地从猪伪狂犬病病毒感染的细胞中扩增出预期的178bp片段,而猪繁殖与呼吸综合征病毒、猪细小病毒、猪瘟病毒、猪流感病毒和猪伪狂犬病病毒gE基因缺失株均未扩增出相应的片段,经PCR扩增产物测序鉴定,证实了该扩增片段为预期目的片段;敏感性试验表明,该体系可检测到102TCID50的猪伪狂犬病病毒。本方法的建立能够区分基因缺失疫苗免疫猪和野毒感染猪,使猪伪狂犬病病毒的检测更为快速、准确。  相似文献   

6.
PCR检测猪伪狂犬病病毒方法的研究   总被引:10,自引:0,他引:10  
根据编码猪伪狂犬病病毒gH基因保守序列,设计合成一对引物,通过改进病毒核酸提取方法和优化PCR反应条件,成功的从猪伪狂犬病毒感染的细胞中扩增出预期的355bp片段。而猪繁殖与呼吸综合征病毒、猪细小病毒、猪瘟病毒、猪乙型脑炎病毒和正常细胞均未扩增出相应的片段,经NaeⅠ酶切鉴定,证实了该扩增片段的特异性;敏感性实验表明,该体系可检测到0.48Pg的猪伪狂犬病毒DNA。本方法的建立使猪伪狂犬病病毒的检测更为快速、简便、经济、实用。  相似文献   

7.
三种PCR方法诊断猪伪狂犬病的比较研究   总被引:8,自引:0,他引:8  
针对伪狂犬病毒gD基因的不同片段设计三对引物,分别进行PCR扩增用于猪伪狂犬病的诊断,扩增的三个片段的长度分别为262bp、217pb以及1203bp的全基因。通过比较发现,这三种PCB诊断方法均具有很高的特异性和敏感性,值扩增gD基因内部262bp的PCR诊断方法种具有突出优点,其退火与延伸合成一步,其操作可于1h内完成,敏感性更高,更适于猪伪狂犬病的快速诊断。  相似文献   

8.
用核酸探针检测伪狂犬病的研究   总被引:1,自引:0,他引:1  
用光敏生物素标记伪狂犬病毒(PRV)特异性糖蛋白GP50克隆重组质粒PUP作为探针,检测实验感染乳猪15头份以及屠宰场随机采样15头份证明通过PCR和分子克隆技术制备的PRV特异性糖蛋白基因片段的光敏生物素探针,能有效地用于临床检测伪狂犬病。  相似文献   

9.
应用聚合酶链反应检测伪狂犬病病毒DNA   总被引:1,自引:0,他引:1  
选用标准的伪狂犬病病毒(PRV)闽A株,经BHK21细胞培养,提取PRVDNA作为摸板;合成1对20-mer寡核苷酸作为引物;选择扩增序列由262个碱基对组成的位于编码多糖蛋白gp50基因,用耐热的Taq-DNA聚合酶经30个循环以后,扩增的产物直接用凝胶电泳检测,并用标准分子量确定。结果表明:以PRVDNA作为模板进行扩增,有扩增产物生成,以同科的疱疹病毒DNA作为模板在相同的条件下进行PCR扩增,无扩增产物生成,说明PRVPCR扩增是特异的。PCR技术检测PRVDNA敏感度为28.5pg.PRVPCR技术的建立,为伪狂犬病诊断和流行病学研究提供了更敏感、可靠的手段。  相似文献   

10.
应用PCR方法从包含伪狂犬病病毒(PRV)Fa株糖蛋白gD基因的重组质粒pB13中扩增出糖蛋白gD基因去信号肽片段,将其克隆到大肠埃希氏菌表达载体pThiohisA中。测序结果表明,糖蛋白gD基因去信号肽片段长1155bp,与PRVFa株糖蛋白gD基因完全一致。经1mmol/L IPTG诱导后,重组质粒pThiohisA-gD在大肠埃希氏 菌XL1-blue、Top10、DE3和DH5a中均得到表达,其中在宿主菌XL 1-blue中表达量最高。Western-blotting结果显示,大肠埃希氏菌XL1-blue表达的糖蛋白gD具有免疫原性。  相似文献   

11.
During monitoring of certified pseudorabies (PRV)-free herds to confirm their PRV -free status, occasional individual gE-seropositive pigs are detected. These single-reactor pigs remain gE-seropositive when further serum samples are collected and tested. For the eradication programme to proceed, it is important to determine whether these pigs are only false positives or are; in fact, infected with field PRV. The purpose of this study was to determine whether the polymerase chain reaction (PCR) could detect field PRVDNA in single-reactor pigs and so confirm positive reactions in the serologic monitoring programme. First, DNA samples of various tissues from 15 single-reactor pigs all from different herds were examined for field PRV by PCR. Additionally, serum samples from these pigs were analyzed in a gE-confirmation enzyme linked immunosorbent assay (gE-confirmation ELISA). PCR detected PRVDNA in five of the 15 pigs, and these results were confirmed by the gE-confirmation ELISA. The remaining 10 pigs that tested negative in the PCR also tested negative in the gE- confirmation ELISA. We conclude that PCR can be used to discriminate between true and false serological positive single-reactor pigs and, moreover, that the gE-confirmation ELISA confirms these PCR results.  相似文献   

12.
根据GenBank中已发表的猪细小病毒(porcine parvovirus,PPV)、猪伪狂犬病病毒(pseudorabies virus,PRV)和猪圆环病毒2型 (porcine circovirus type 2,PCV2)基因序列,对各病毒基因区进行同源性分析,确定PPV 的VP2、PRV的 gD、和PCV2的ORF2基因为各病毒的诊断靶序列,设计特异性引物,在建立各病毒单项PCR技术的基础上,优化多重PCR反应条件,建立了3种病毒的多重PCR技术,可同时扩增PPV 313 bp、 PRV 217 bp和PCV2 447 bp的特异性片段。用多重PCR技术与单项PCR技术对比检测试验证明两者的符合率为100%,表明建立的多重PCR检测方法,具有特异、快速、准确的特点,可同时鉴别诊断这3种病毒。从10个发病猪场和门诊病例的病猪采集的211份样品,用建立的多重PCR检测方法,检出PPV阳性42份,阳性率为19.91%;PRV阳性26份,阳性率为12.32%;PCV2阳性56份,阳性率为26.54%;2种以上病毒混合感染25份,混合感染阳性率为11.85%。检测结果表明,山西省猪群已感染这3种疫病。  相似文献   

13.
12 Large-White-Landrace piglets were subdivided in four groups of 3 and housed in separate units. The piglets of three groups were inoculated with the 86/27V 6C2 thymidine kinase negative (TK-) mutant of pseudorabies virus (PRV), by different routes. A second inoculation with the same mutant was given to the pigs 21 days later. The animals of a fourth group were left as uninoculated controls. 21 days following the second inoculation with the TK- mutant all pigs were challenge infected with the virulent PRV. On post challenge day (PCD) 30 all pigs were killed and samples for virus detection and histology were taken from several organs. The inoculated TK- mutant of PRV did not induce any ill effects in the pigs except a transient febrile reaction in some animals. Virus was recovered from nasal swabbings from one pig 2 days after the first inoculation of the mutant. After challenge exposure with virulent PRV, the TK- mutant-inoculated pigs were apparently protected, whereas the control pigs all were severely affected and recovered very slowly over 3 weeks. Virus was isolated from the nasal swabbings from the TK- mutant-inoculated pigs on PCDs 2 and 4, whereas the nasal swabbings from the control piglets were all positive for virus from PCD 2 through PCD 10. DNA analysis of the virus recovered showed a pattern identical to that of the virulent PRV. Histologic lesions were found in the respiratory and the central nervous systems, however, the lesions in the TK- mutant-inoculated pigs were much milder compared to those registered for the control pigs. Virus was not isolated from any of the tissue samples that were tested, but viral DNA with sequences typical of PRV genome was detected by PCR in all samples of trigeminal ganglia from either the TK- mutant-inoculated pigs or from the controls.  相似文献   

14.
Pseudorabies virus (PRV) is endemic in some regions of Japan. We investigated the effects of PRV infection status on herd productivity. Serum samples were obtained from 48 swine herds in Japan. Within each herd, three serum samples were obtained from growing pigs at four different ages, as well as from sows in low and high parity groups. Sera were tested for antibodies against wild-type PRV via competitive ELISA. Herds were classified into PRV positive and negative groups based on serological results. Herds infected with PRV exhibited postweaning mortalities (6.84%) that were significantly (P=0.0018) higher than those in unaffected herds (4.73%). Because of the reduced productivity in PRV positive herds, the current PRV eradication program must be strengthened.  相似文献   

15.
The presence of the pseudorabies virus (PRV) genome in infected hosts has previously been studied by standard hybridization techniques, which showed the viral genome to be present at very low levels in infected tissues. The recently introduced polymerase chain reaction (PCR) procedure provides an alternative and rapid means of amplifying small quantities of specific DNA sequences. We applied this technique to a study of pigs infected by PRV. The sequence selected for amplification consisted of 222 base pairs lying in the gene coding for the glycoprotein gp50. We used a pair of 20-mer oligonucleotides flanking this sequence as primer and a cloned Stu-Nde fragment containing the sequence as target DNA. To avoid the tedious DNA extraction procedure we performed PCR directly on disrupted cells and detected specific amplification after 25 cycles of PCR with the thermostable Taq DNA polymerase. Amplified products were detected by gel electrophoresis directly. Nasal samples from experimentally and naturally infected pigs were tested by this PCR technique. When compared with tissue culture and serological tests, detection by gel electrophoresis of PCR amplified fragments provided excellent specificity and sensitivity. We concluded that PCR amplification will be a valuable tool for rapid diagnosis of PRV infection in pigs, taking less than 1 h to complete.  相似文献   

16.
为建立猪伪狂犬病病毒(PRV)gE基因缺失疫苗和野毒感染的快速鉴别诊断方法,本研究根据猪伪狂犬病野毒具有gD表面抗原基因和gE毒力基因,而基因缺失疫苗只有gD基因无gE基因的特性,针对gD/gE基因的5′端核苷酸序列自行设计引物,建立鉴别PRVgE基因缺失疫苗和野毒感染的二重PCR诊断方法,并进行了特异性、敏感性和重复性试验;利用所建立的检测方法对临床疑似样品进行了检测。结果表明,成功建立了鉴别PRV gE基因缺失疫苗和野毒感染的二重PCR诊断方法,该方法灵敏度高,最低检出限为100拷贝/μL;重复性好;特异性强,可特异性地扩增出PRV细胞毒中的gD和gE基因及gE基因缺失疫苗毒中的gD基因,但对PK-15细胞和猪流行性腹泻病毒等其他8种病原扩增不出任何条带;自835份临床疑似PRV感染病料中共检测出PRVgD和gE基因双阳性样品即野毒感染阳性样品267份,PRVgD基因单阳性样品28份,选取该方法检测出的26份PRV野毒感染阳性样品用于病原分离培养,两种方法的符合率为96.1%。说明本试验建立的二重PCR鉴别诊断方法快速、灵敏、特异,对于临床上疫苗毒和野毒感染的快速鉴别诊断具有重要意义。  相似文献   

17.
广西某地区猪伪狂犬病血清学调查   总被引:2,自引:0,他引:2  
采用乳胶凝集试验对广西某地区的68个养猪场和10个自然村40个散养的1 307头免疫和非免疫猪的血清进行伪狂犬病(PR)抗体检测,结果共有739头份血清抗体阳性,阳性率为56.54%,其中伪狂犬病疫苗免疫猪和非免疫猪的血清抗体阳性率分别为66.73%和18.47%.未免疫的规模猪场和散养户的血清抗体阳性率分别为21.43%和16%.结果表明,部分免疫猪的PRV抗体水平较低,应及时进行强化免疫;部分未免疫猪的血清抗体呈阳性,存在PRV感染现象,而且规模猪场感染程度比散养户严重,应及时采取必要的防控措施.  相似文献   

18.
本文通过荧光抗体组织切片、细胞接种、兔子致病性等方法对临床怀疑为猪伪狂犬病的病猪进行了实验室诊断。结果如下:病猪脾脏和淋巴结制备的冰冻切片经PRV荧光抗体染色后,在荧光显微镜下见到特异性荧光;病料经处理后接种Vero细胞可致细胞圆缩和形成合胞体,具有疱疹病毒的培养特征;将病料上清和细胞培养毒分别皮下接种家兔均可引起奇痒、麻痹死亡,呈现典型的伪狂犬病临床特征,同时病死兔脏器的PRV免疫荧光试验也为阳性。根据上述结果证实了该病为猪伪狂犬病。  相似文献   

19.
以猪弓形虫核糖体DNA第一内转录间隔区(ITS1)序列为模板自行设计引物,建立了猪弓形虫病特异PCR诊断方法,并从弓形虫国际标准强毒株RH速殖子和疑似T.gondii感染猪全血及肺脏组织样品基因组DNA中扩增出了预期长度273bp的目的DNA片段。敏感性和特异性试验结果显示,该PCR方法能检测到的最低DNA量为0.001ng,且与相关的9种对照寄生虫、细菌和病毒无交叉反应。用建立的PCR诊断方法对临床30份猪弓形虫疑似病料和60份健康猪抗凝全血样品进行检测,结果30份病料中有24份呈现阳性;60份健康猪血中有5份为阳性;随机取两个临床样品的阳性PCR扩增片段进行克隆测序表明,二者序列与Gen-Bank中已登录的猪弓形虫ITS1基因相应部分序列完全相同。以上表明所建立的PCR方法具有高度的敏感性和特异性;本研究为猪弓形虫病的快速诊断提供了一种新方法。  相似文献   

20.
为了解某集约化猪场伪狂犬病病毒(PRV)的感染情况,清除感染猪只,净化伪狂犬病,提高猪群的健康水平.采用PRV gE抗体ELISA检测试剂盒,对该场免疫了猪伪狂犬病基因缺失疫苗的猪群进行3次野毒感染检测;应用荧光PCR方法,对临床发病的仔猪进行PRV病原检测.经过动态监测、加强综合防控和逐步淘汰措施,该猪场的PRV野毒感染率从35.29%逐步降低至0%,猪场自繁的仔猪存活率高,无PRV感染,净化效果良好.  相似文献   

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