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为建立便捷、快速检测猪圆环病毒2型(PCV2)抗体的免疫层析方法,本研究利用G蛋白标记胶体金制备金标垫,以PCV2病毒样颗粒(VLPs)和兔Ig G分别作为检测线与质控线组装胶体金试纸条。检测结果显示,该试纸条与A型塞内卡病毒(SVA)、猪细小病毒(PPV)、伪狂犬病毒(PRV)等猪其它病毒抗体阳性血清无交叉反应,仅对PCV2抗体阳性血清具有高度的特异性;对PCV 2阳性血清最低检测限为1∶6 400稀释度,敏感性较高;批内、批间变异系数CV均小于5%,重复性较好。试纸条在4℃保存6个月,其特异性和敏感性无明显变化。对采集的100份临床血清样品进行检测,该方法与标准ELISA的总符合率为98%。表明本研究建立的PCV2抗体的胶体金免疫层析检测方法具有敏感、特异、稳定等特点,可以做为评价PCV2疫苗免疫效果及其感染筛查的检测方法。 相似文献
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《中国兽医杂志》2016,(9)
为建立一种简单、快速、敏感、特异的猪伪狂犬病病毒野毒抗体血清学检测方法,本研究利用胶体金标记SPA蛋白作为金标垫,以重组g E蛋白和猪Ig G分别作为检测线和质控线,组装检测猪伪狂犬病病毒g E抗体的胶体金免疫层析试纸条。该试纸条肉眼于15 min内即可判定结果,检测PCV-2、PRRSV、PEDV、CSFV、PPV、PRV疫苗毒的阳性血清均为阴性,检测PRV野毒阳性血清的灵敏度达1∶1 280,与IDEXX g E-ELISA抗体检测试剂盒的符合率为95.31%,室温条件下可稳定保存6个月以上。本研究研制的PRV野毒抗体胶体金免疫层析试纸条操作简单、检测快速、敏感性高、特异性强,可用于PRV野毒感染的快速诊断,特别适合于现场检测。 相似文献
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检测猪瘟病毒野毒株胶体金免疫层析方法的建立 总被引：8，自引：1，他引：7
为建立快速、简便检测猪瘟病毒(CSFV)野毒的胶体金免疫层析方法(GICA),本研究采用柠檬酸三钠还原法制备胶体金颗粒,标记纯化的抗CSFVE2蛋白的单克隆抗体(MAb)6E10作为捕捉抗体,将纯化的抗CSFVE2蛋白的MAbHQ06和兔抗鼠IgG抗体包被在硝酸纤维素膜上,分别作为检测线和质控线,优化反应条件,组装成胶体金免疫层析试纸条。结果表明,所制备的试纸条用于检测CSFV野毒感染的PK-15细胞培养物,在检测线和质控线处均呈现红色条带,健康PK-15细胞培养物对照仅在质控线呈现红色条带;试纸条检出病毒培养物的最低限为103.5 TCID50;用不同批次的试纸条重复检测,结果无差异;该试纸条不与猪瘟兔化弱毒(HCLV)、牛病毒性腹泻病毒(BVDV)、猪繁殖与呼吸综合征病毒(PRRSV)、传染性胃肠炎病毒(TGEV)、猪流行性腹泻病毒(PEDV)、猪轮状病毒(PRV)、伪狂犬病病毒(PrV)、猪细小病毒(PPV)和猪圆环病毒2型(PCV2)反应。所制备的试纸条具有良好的特异性、敏感性和重复性,初步达到了区分检测CSFV野毒株和弱毒株的目的。 相似文献
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旨在建立猪肺炎支原体(Mycoplasma hyopneumoniae,Mhp)抗体胶体金免疫层析检测方法,从而快速地对Mhp的感染和免疫情况进行监测,预防和控制猪支原体肺炎传播。通过柠檬酸三钠还原法制备胶体金颗粒,确定Mhp特异性抗原P46蛋白的最适标记pH和标记浓度并进行标记,作为金标液。将P46蛋白包被检测线T线,抗P46蛋白单抗包被质控线C线,组装检测试纸条。经优化,建立可同时用于Mhp血清抗体和黏膜抗体检测的胶体金免疫层析检测方法。利用该检测方法对76份临床血清样品和40份临床鼻拭子样品进行检测,并与ELISA检测结果进行比较。用该试纸条检测血清样品时,灵敏性、特异性、重复性较好,与商品化Mhp ELISA抗体检测试剂盒符合率为96.1%;该方法检测呼吸道鼻拭子样品时,存在微弱的非特异性反应,检测结果与本实验室建立的sIgAELISA检测方法符合率为87.5%。本研究成功建立了Mhp抗体胶体金免疫层析检测方法,整个过程只需10 min。检测血清样品具有较好的特异性和灵敏性,检测鼻拭子样品时特异性还有待提高。 相似文献
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快速检测猪繁殖与呼吸综合征病毒胶体金免疫层析方法的建立 总被引：2，自引：0，他引：2
为建立一种快速、简便、灵敏的检测猪繁殖与呼吸综合征病毒(PRRSV)的胶体金免疫层析方法(GICA),本研究采用柠檬酸三钠还原法制备了胶体金颗粒,标记抗PRRSVN蛋白的单克隆抗体(MAb) 2D7制备免疫检测探针,将抗PRRSVN蛋白的MAb 1G7和羊抗鼠IgG抗体印迹在硝酸纤维素膜上,分别作为检测线和质控线,经条件优化,组装成胶体金免疫层析试纸条.本研究制备的PRRSV胶体金试纸条的最低检测限度为103.0 TCID50/mL;在特异性试验中,试纸条检测PRRSV呈阳性,其它主要猪病病原均为阴性;不同批次试纸条重复检测,结果无差异;对现地猪场送检的150份病料进行PRRSV病原检测,与RT-PCR相比较,试纸条的特异性和敏感性分别为98.13％和88.37％.两种方法的一致性Kappa值为0.882.建立的PRRSV抗原胶体金免疫层析检测方法具有良好的的敏感性、特异性、重复性及现地应用性.该试纸条的研制为PRRS的快速诊断及免疫预防提供了技术手段. 相似文献
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《中国兽医学报》2017,(8):1463-1467
为了建立一种猪伪狂犬病gB抗体检测试纸,为养猪业基层工作人员提供一种快速简便的狂犬病免疫抗体评价方法。胶体金标记gB蛋白作为探针,SPA和猪抗伪狂犬病病毒多抗IgG分别作为检测线和质控线,建立了猪伪狂犬病gB抗体检测试纸。猪伪狂犬病质控血清和疫苗免疫猪血清用来评价其特异性,敏感性以及与IDEXX PRV gB ELISA试剂盒的符合率试验。试验结果显示,该试纸条具有较高的特异性和敏感性,与IDEXX PRV gB ELISA试剂盒的符合率为91.04%;该免疫层析试纸条具有快速(5min)、特异、敏感等优点,不需要专门的仪器设备和专业技术人员,适合于田间推广应用。 相似文献
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检测犬抗狂犬病毒抗体的胶体金免疫层析法的建立及应用 总被引：1，自引：0，他引：1
为建立一种简便快速的胶体金免疫层析方法(GICA)以用于检测犬抗狂犬病毒抗体,本研究运用间接反应一步法原理,采用柠檬酸三钠还原法制备胶体金颗粒用以标记抗犬IgG抗体形成金-抗犬IgG抗体复合物,制成金标结合垫,加上包被有狂犬病毒糖蛋白的硝酸纤维膜,即制成胶体金免疫层析试纸条.样品中狂犬病? 毒抗体与金标记抗体结合后沿硝酸纤维素膜移动,与膜上的糖蛋白特异结合形成肉眼可见的红色线条.试验结果显示,GICA试纸条与抗狂犬病毒抗体有特异性反应,与犬瘟热病毒、犬细小病毒等的抗体无交叉反应;GICA与标准ELISA法比较的总符合率为99.4%.结果表明,GICA试纸条检测抗狂犬病毒抗体特异性强、成本低,操作简便,不需任何仪器,特别适用于野外以及现场使用. 相似文献
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猪圆环病毒2型免疫过氧化物酶单层细胞试验抗体检测试剂盒的研制及应用 总被引：10，自引：4，他引：10
本研究建立了一种免疫过氧化物酶单层细胞试验（Immunoperoxidase monolayer assay,IPMA）,用于猪圆环病毒2型血清抗体检测,通过对IPMA反应条件的优化,组装了诊断试剂盒。研究结果表明,用IPMA检测猪圆环病毒2型人工感染猪血清,于感染后3周抗体阳转,第3周～10周抗体阳性检出率为92.8%（52/56）,对照组猪血清抗体检测均为阴性（33/33）。试剂盒在-20℃稳定保存18个月与其他几种猪病毒参考血清无交叉反应,与用重组蛋白抗原建立的rcELISA符合率为89.2%。对来自黑龙江、吉林、河北、上海、内蒙古、云南、江西等地猪场健康成年猪血清480份和发病猪血清424份进行了检测,抗体检出率分别为91.7%和79.2%,表明我国猪群中猪圆环病毒2型污染相当严重。该试剂盒的研制为我国PCV2流行病学调查和疫苗免疫效果的评价提供了技术手段。 相似文献
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Sibila M Calsamiglia M Segalés J Blanchard P Badiella L Le Dimna M Jestin A Domingo M 《American journal of veterinary research》2004,65(1):88-92
OBJECTIVE: To determine whether correlations exist between viremia with porcine circovirus type 2 (PCV2) and serum antibody profiles and between detection of PCV2 in nasal cavities and viremia of pigs from farms with and without postweaning multisystemic wasting syndrome (PMWS). ANIMALS: 495 pigs, ranging from the late nursery stage to the early grower-finisher stage of production. PROCEDURE: Serum antibodies to PCV2 were studied with an ELISA that detects the ORF2 viral protein. Nasal swab specimens and serum samples were tested with a PCV2-specific PCR assay. RESULTS: PCV2 DNA and serum antibodies to PCV2 were detected in pigs from all farms, although in different proportions. Overall, PCV2 DNA was detected in greater percentages in serum samples and nasal swab specimens of pigs from farms with PMWS. Although viral DNA was detected in both serum samples and nasal swab specimens, PCV2 detection in nasal swab specimens was higher than in serum samples of pigs from all farms. Serum antibodies to PCV2 were detected in a greater percentage of pigs from farms with PMWS, compared with farms without PMWS. CONCLUSIONS AND CLINICAL RELEVANCE: A high prevalence of PCV2 infection was found in pigs from farms with and without PMWS. Besides the presence of PCV2, unknown additional factors may be necessary to induce the full expression of PMWS. 相似文献
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试验开展了犬C-反应蛋白(C-CRP)荧光微球免疫层析定量方法的研究,旨在研制一种操作简易、灵敏度高,用于快速定量检测C-CRP荧光免疫层析试纸条。采用双抗体夹心法和荧光免疫层析技术,以羧基荧光微球标记的抗C-CRP单克隆抗体及羊抗鸡IgY为标记抗体,抗C-CRP单克隆抗体和鸡IgY分别作为检测线和质控线制备荧光免疫层析试纸条。结果显示,所制备C-CRP检测试纸条的检测范围为0.5～250mg/L,检测限为0.5mg/L,批内和批间变异系数(CV)分别为0.68%～6.94%和0.89%～8.79%,平均回收率为98.15%～101.19%,试剂与9种干扰物质无交叉反应。加速破坏稳定性试验表明试纸条可以常温放置24个月。临床样本测试发现,其与I-CHROMA试剂盒检测结果相关性良好(R2=0.995)。综上所述,该荧光免疫层析试纸条灵敏度、特异度较高,且操作简单、快速,可用于宠物犬临床检测。 相似文献
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Seroprevalence of porcine circovirus type 2 in swine populations in Canada and Costa Rica 总被引：12，自引：1，他引：11 
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下载免费PDF全文 Qiang Liu Li Wang Philip Willson Brendan O'Connor Julia Keenliside Manuel Chirino-Trejo Ronald Melndez Lorne Babiuk 《Canadian journal of veterinary research》2002,66(4):225-231
Porcine circovirus (PCV) was recently divided into 2 antigenically distinct types that differ (65% amino acid identity) in the protein encoded by open reading frame 2 (ORF2). Porcine circovirus 1 is apparently non-pathogenic and, in contrast, PCV2 is associated with porcine multisystemic wasting syndrome (PMWS). Our objective was to determine the extent of exposure of normal pigs in Canada and Costa Rica to PCV2. Recombinant DNA techniques were used to produce an antigen from ORF2 of PCV2 that was suitable for the detection of antibody in swine sera. The presence of PCV2 nucleotide sequences was detected using polymerase chain reaction (PCR) techniques. Using these tests, specific antibody and nucleotide sequences were demonstrated in sera from a cohort of pigs during a PMWS outbreak. Antibody was detected in normal, healthy hogs slaughtered in Canada (82.4% of 386) and in Costa Rica (14.6% of 322). This is the first report indicating the presence of PCV2 in Latin America. More than 50% of these sera also contained PCV2 nucleotide sequence. Although these hogs were healthy when slaughtered, they were infected with PCV2 and may have previously been ill. The widespread occurrence of PCV2 in swine suggests that this virus is adapted to replication in porcine tissue. 相似文献
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An ORF2 protein-based ELISA for porcine circovirus type 2 antibodies in post-weaning multisystemic wasting syndrome 总被引：14，自引：0，他引：14
Blanchard P Mahé D Cariolet R Truong C Le Dimna M Arnauld C Rose N Eveno E Albina E Madec F Jestin A 《Veterinary microbiology》2003,94(3):183-194
Porcine circovirus type 2 (PCV2) plays a crucial role in the pathogenesis of post-weaning multisystemic wasting syndrome (PMWS) in swine. As PCV2 displays significant homology with PCV1 (a non-pathogenic virus) at the nucleotide and amino-acid level, a discriminative antigen is needed for specific serological diagnosis. The ORF2-encoded capsid protein from PCV2 was used to develop an indirect enzyme-linked immunosorbent assay (ELISA). GST-fused capsid protein from PCV2 and GST alone (both expressed in recombinant baculovirus-infected cells) were used as antigens for serodiagnosis. The specificity of the ELISA for detection of PCV2 antibodies was demonstrated in sera from pigs experimentally infected with PCV1, PCV2 and other swine viruses. The semi-quantitative nature of the test was evaluated versus an immunoperoxidase monolayer assay (IPMA). The ELISA was performed on 322 sera from pigs in eight Brittany herds and compared with IPMA. The sensitivity (98.2%) and specificity (94.5%) of this test were considered suitable for individual serological detection. High PCV2 seroprevalence was found in sows and pigs at the end of the growth phase (18-19 weeks) in all eight herds. The seroprevalence in piglets (11-17 weeks) was statistically correlated with clinical symptoms of PMWS (93% in affected versus 54%, in non-affected farms). A cohort study performed in PMWS-free farms showed that 57% of piglets exhibited active seroconversion after 13 weeks, indicating that PCV2 infection occurred earlier in PMWS-affected piglets. 相似文献
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Sherry Kurtz Lloren? Grau-Roma Martí Cortey Maria Fort Fernando Rodríguez Marina Sibila Joaquim Segalés 《Veterinary research》2014,45(1):29
Porcine circovirus type 2 (PCV2) is the essential infectious agent for PCV2-systemic disease (PCV2-SD, formerly known as postweaning multisystemic wasting syndrome) and other pathological conditions. Recent studies indicated antigenic variability amongst different PCV2 isolates and suggested that single amino acid changes within the capsid protein determine differences in the level of neutralization by specific monoclonal antibodies. The objective of the present study was to examine the cross-reactivity of PCV2 antibodies induced in the context of a natural infection against different PCV2 isolates belonging to genotypes PCV2a and PCV2b. Sera taken from several farms from animals of varying health status (PCV2-SD and age-matched healthy pigs and a set of slaughter-aged animals) were assayed for neutralizing activity against four PCV2 isolates from both predominant genotypes (PCV2a and PCV2b) and of differing geographic origins (Europe and North-America). Results showed that most of studied pigs (79 out of 82) contained neutralizing antibodies (NA) able to neutralize all four studied viral strains. Overall, pigs had significantly higher NA titres against PCV2a than against PCV2b (P < 0.001). Accordingly, studied serums were able to better neutralize Burgos390L4 and Stoon-1010 strains (PCV2a) than L-33-Sp-10-54 and MO/S-06 strains (PCV2b) (P < 0.001). No differences between capabilities of seroneutralization of viruses from different geographic origin were observed. Present data suggests that sequence differences between PCV2 isolates translate to functional antigenic differences in viral neutralization in vivo. 相似文献
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Inger M Brunborg Caroline Fossum Bj?rn Lium Gunilla Blomqvist Elodie Merlot Anne J?rgensen Lena Eliasson-Selling Espen Rimstad Christine M Jonassen Per Wallgren 《Acta veterinaria Scandinavica》2010,52(1):22
Background
Despite that PMWS commonly affects pigs aged eight to sixteen weeks; most studies of PMWS have been conducted during the period before transfer to finishing herds. This study focused on PCV2 load and antibody dynamics in finishing herds with different PMWS status.Methods
Sequentially collected blood samples from 40 pigs in each of two Swedish (A and B) and one Norwegian (C) finishing herds were analysed for serum PCV2-load and -antibodies and saliva cortisol. The two Swedish herds differed in PMWS status, despite receiving animals from the same sow pool (multi-site production). However, the PMWS-deemed herd (A) had previously also received pigs from the spot market. ResultsThe initial serum PCV2 load was similar in the two Swedish herds. In herd A, it peaked after two weeks in the finishing herd and a high number of the pigs had serum PCV2 levels above 107 per ml. The antibody titres increased continually with exception for the pigs that developed PMWS, that had initially low and then declining antibody levels. Pigs in the healthy herd B also expressed high titres of antibodies to PCV2 on arrival but remained at that level throughout the study whereas the viral load steadily decreased. No PCV2 antibodies and only low amounts of PCV2 DNA were detected in serum collected during the first five weeks in the PMWS-free herd C. Thereafter a peak in serum PCV2 load accompanied by an antibody response was recorded. PCV2 from the two Swedish herds grouped into genotype PCV2b whereas the Norwegian isolate grouped into PCV2a. Cortisol levels were lower in herd C than in herds A and B.Conclusions
The most obvious difference between the Swedish finishing herds and the Norwegian herd was the time of infection with PCV2 in relation to the time of allocation, as well as the genotype of PCV2. Clinical PMWS was preceded by low levels of serum antibodies and a high load of PCV2 but did not develop in all such animals. It is notable that herd A became affected by PMWS after errors in management routine, emphasising the importance of proper hygiene and general disease-preventing measures. 相似文献19.
Serological Investigation and Genomic Characterization of PCV2 Isolates from Different Geographic Regions of Zhejiang Province in China 总被引：1，自引：0，他引：1
Zhou JY Chen QX Ye JX Shen HG Chen TF Shang SB 《Veterinary research communications》2006,30(2):205-220
Sera collected from 46 swine farms in Zhejiang province were evaluated for the presence of antibodies to PCV2 using an indirect-fluorescent
antibody procedure. In addition PCV2 isolated from superficial inguinal lymph node samples collected from 40-to 90-day-old
pigs with clinical signs of post-weaning multisystemic wasting syndrome (PMWS) using the PK-15 cell line were sequenced and
compared. Overall seroprevalence of PCV2 antibody averaged 58.34% for all samples. Breakdown of serology by groups was as
follows: 59.38% for sows, 57.41% for post-weaning piglets, 44.83% for Landrace sows and 64.28% for Landrace piglets. The seroprevalence
of Landrace sows was higher than that of Yorkshire and Duroc sows, but non-significant (p > 0.05). Serological analysis also
showed that seroprevalence of PCV2 antibody was a negative correlation to that of PRRSV antibody. The complete genomes of
five PCV2 isolates identified in the herds with PMWS consisted of 1767nt, containing the 11 potential ORFs. Genome of the
virus isolates shared 93.8% to 99.8% identity with PCV2 reference strains from GenBank, 76.6% to 77.9% identity with PCV1.
Phylogenetic analysis indicated that there were two subgenotypes within PCV2: subgenotype I (1767 nt) and subgenotype II (1768
nt). 相似文献
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The detection of porcine circovirus in the Australian pig herd 总被引：4，自引：0，他引：4
Raye W Muhling J Warfe L Buddle JR Palmer C Wilcox GE 《Australian veterinary journal》2005,83(5):300-304
OBJECTIVE: To determine if porcine circovirus (PCV) type 1 (PCV1) or type 2 (PCV2) is present in the Australian pig herd, to conduct preliminary genetic characterisation of any viruses detected, and to determine if there is any obvious virological reason why post-weaning multisystemic wasting disease (PMWS), associated with PCV infection in other countries, has not been detected in Australia. DESIGN: Serum samples were collected from 14 randomly selected pig farms in Western Australia and used for detection of PCV antibody. Additional samples from one farm were obtained at 2-week intervals from pigs between 2 and 12 weeks of age to detect any age-associated variations in prevalence of infection. Veterinary practitioners from four Australian states submitted tissues of dead or unthrifty weaned pigs, and these were examined for evidence of PCV1 and PCV2 infection. PROCEDURE: Sera were tested for antibody to PCV using an indirect immunofluorescence assay (IFA). Tissues were tested for PCV1 and PCV2 genomic material using a multiplex PCR. RESULTS: PCV antibody was detected in approximately 30% of Western Australian pigs tested. PCV1 DNA was detected in tissue samples from Western Australia, South Australia and New South Wales and PCV2 DNA was detected in tissue samples from Western Australia, New South Wales and Queensland. Sequence analysis of the PCR products indicated the PCV1 and PCV2 present in Australia were very similar to strains in other countries where PMWS is endemic. CONCLUSION: Both PCV1 and PCV2 are present in Australia and the viruses present appear similar to those in countries with PMWS. The absence of PCV2-associated PMWS in Australia may be due to absence of essential secondary factors required for PCV2 to produce PMWS. 相似文献