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应用弓形虫重组蛋白rMIC3为抗原建立的酶联免疫吸附试验(ELISA)和乳胶凝集试验(LAT)2种方法,平行检测来自36个猪场的471份猪血清中的抗弓形虫特异性抗体。结果显示,ELISA和LAT对母猪弓形虫抗体的阳性检出率分别为42.86%(21/49)和44.90%(22/49),2种方法的阳性检出符合率为95.45%(21/22);对育肥猪的阳性检出率分别为42.06%(135/321)和43.61%(140/321),2种方法的阳性检出符合率为93.57%(131/140);对仔猪的阳性检出率分别为29.07%(30/101)和45.54%(46/101),2种方法的阳性检出符合率为63.04%(29/46)。结果表明,ELISA和LAT可用于猪弓形虫病的诊断和血清学调查,LAT更适合于仔猪弓形虫病的检测。 相似文献
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猪乙型脑炎乳胶凝集试验与血凝抑制试验方法的比较 总被引：2，自引：0，他引：2
用血凝抑制试验 (HI)和乳胶凝集试验 (LAT)两种方法检测乙型脑炎弱毒疫苗免疫猪血清 ,结果均呈阳性反应。用LAT对来自 12个猪场的 94份猪血清进行了乙型脑炎病毒 (JEV)抗体检测 ,并与HI进行了对比 ,两种方法检测结果阳性符合率和总符合率分别为 90 .3% (5 6 /6 2 )和 88.3% (83/94 ) ,两种方法检测结果差异不显著 (p >0 .0 5 )。对来自无乙型脑炎的 12头健康猪血清进行检测 ,两种方法检测结果均为阴性。结果表明 ,用LAT与HI检测乙型脑炎结果符合 ,前者更为简便和实用。 相似文献
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为比较蓝舌病病毒(BTV)cELISA和血清中和试验(SNT)检测方法的特点与关系,通过灭活、浓缩,制备抗原含量为1、5、10、50、100μg/mL的BTV-1型灭活疫苗。每个含量为1组,并设对照组,每组6只绵羊,分别在0、3周免疫。每周采血1次,共采血6次。对所采血样分别用cELISA和SNT方法进行抗体检测。cELISA检测结果显示,免疫后第1周,抗体阳性率达到80.00%,第4周全部免疫羊转为抗体阳性,抗体产生较为迅速;SNT检测结果显示,中和抗体阳性率从免疫后第1周的6.67%持续上升至第3周的36.67%,至第4周达到70.00%,中和抗体产生持续而缓慢。随着时间延长,2种检测方法的符合率由23.33%增加到76.67%。当绵羊同时产生中和抗体和cELISA抗体时,中和抗体效价与cELISA抑制率间有显著的线性相关关系(r=0.63),相关方程为y=0.38+0.05χ。分析认为,中和抗体出现的时间之所以晚于cELISA抗体,可能是因为与宿主细胞识别并吸附的主要部位VP7蛋白位于病毒衣壳的中间位置,其主要表面抗原位点暴露需要时间。 相似文献
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为比较两种商品化赤羽病抗体ELISA试剂盒的敏感性和特异性,以及ELISA和微量血清中和试验(SNT)的符合率,采用两种ELISA试剂盒和血清中和试验,对690份澳大利亚纯种荷斯坦奶牛血清进行牛赤羽病检测。试验结果显示:法国某公司生产的赤羽病ELISA试剂盒敏感性为93.42%,特异性为81.23%,与SNT间的Kappa值为0.615,为高度符合;日本某公司生产的赤羽病ELISA试剂盒敏感性为39.47%,特异性为96.1%,与SNT间的Kappa值为0.427,为中度符合。比较结果表明:日本某公司生产的试剂盒敏感性较低,容易漏检,不适合用于牛赤羽病初筛;在出入境检疫中,可以采用高通量、半自动化、敏感性高的ELISA方法,对血清样本进行筛选,再采用特异性强的SNT试验进行辅助验证。 相似文献
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用新型SPA协同凝集(SPA-CoA)试验对144份猪血清进行了乙型脑炎病毒(JEV)抗体检测,并与血凝抑制试验(HI)进行了对比。2种方法检测结果,血凝抑制试验检测阳性率为57.63%(83/144),新型SPA-CoA阳性率为63.89%(92/144);二者阳性符合率87.00%(80/92),总符合率为88.89%(128/144)。对8份SPF猪血清进行检测,2种方法检测结果均为阴性。结果表明,新型SPA-CoA与HI检测乙型脑炎结果符合,前者更为简便和实用。 相似文献
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采用虎红平板凝集试验(RBT)、全乳环状试验(MRT)和试管凝集试验(SAT)3种国家标准认可的动物布病检疫方法检测奶牛布氏杆菌抗体,并进行了比较研究。从82头非免疫和S2菌苗免疫的奶牛采集血样和乳样,RBT检测血样的阳性率为51.22%(42/82),MRT检测乳样的阳性率为46.34%(38/82),SAT检测血样的阳性率为45.12%(37/82)。以SAT定量检测的结果为参照标准,RBT初筛试验的符合率比MRT高,而且MRT反应强度的差异与SAT抗体滴度没有明显相关性。另对乳清和血清样本中布氏杆菌抗体的差异进行了分析讨论。 相似文献
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为比较蓝舌病病毒（BTV）cELISA和血清中和试验（SNT）检测方法的特点与关系,通过灭活、浓缩,制备抗原含量为1、5、10、50、100 μg/mL的BTV-1型灭活疫苗。每个含量为1组,并设对照组,每组6只绵羊,分别在0、3周免疫。每周采血1次,共采血6次。对所采血样分别用cELISA和SNT方法进行抗体检测。cELISA检测结果显示,免疫后第1周,抗体阳性率达到80.00%,第4周全部免疫羊转为抗体阳性,抗体产生较为迅速;SNT检测结果显示,中和抗体阳性率从免疫后第1周的6.67%持续上升至第3周的36.67%,至第4周达到70.00%,中和抗体产生持续而缓慢。随着时间延长,2种检测方法的符合率由23.33%增加到76.67%。当绵羊同时产生中和抗体和cELISA抗体时,中和抗体效价与cELISA抑制率间有显著的线性相关关系（r=0.63）,相关方程为y=0.38+0.05χ。分析认为,中和抗体出现的时间之所以晚于cELISA抗体,可能是因为与宿主细胞识别并吸附的主要部位VP7蛋白位于病毒衣壳的中间位置,其主要表面抗原位点暴露需要时间。 相似文献
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流行性出血病多克隆抗体C-ELISA检测方法的建立 总被引：2，自引：0，他引：2
为能简便、快速地进行流行性出血病病毒(epizootic haemorrhagic disease virus,EHDV)抗体监测,采用纯化的6型EHDV抗原包被ELISA板,以豚鼠抗EHDV-2型多克隆抗体作为竞争抗体,建立了检测EHDV群特异性抗体的竞争ELISA(C-ELISA)方法。结果显示:抗原最佳包被浓度为5.12μg·mL-1(1∶10 000),竞争抗体最佳稀释倍数为1∶10 000;通过对各270份阴性和阳性的牛、羊血清检测,确定该检测方法临界值为50%;特异性试验表明该ELISA方法仅能检测出不同血清型EHDV抗体,具有较好的群特异性;对已知抗体效价的阳性血清检测表明,建立的C-ELISA方法敏感性好于血清中和试验(SNT)和琼脂扩散试验(AGID);分别用C-ELISA、SNT、RTPCR和病毒分离试验对监控动物采集的血清和抗凝血样品进行检测,ELISA结果与其他3种方法检测结果对应一致。结果表明本研究建立的C-ELISA为EHDV抗体的检测提供了一种快速、敏感、稳定的方法。 相似文献
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乳胶凝集试验与血清中和试验检测猪伪狂犬病血清抗体的 … 总被引：6，自引：0，他引：6
应用血清中和试验（ＳＮＴ）和伪狂犬病乳胶凝集试验（ＬＡＴ）诊断试剂盒对两种伪狂犬病是性血清、伪狂犬病病毒（ＰＲＶ）高兔血甭及６０份被检猪血清进行了ＰＲＶ抗体效价测定和相关性分析,两种方法测得的抗体效价之间呈强相关性（ｒ＝０．９６）,且ＬＡＴ效价比ＳＮＴ一般高出一个滴度;能干为自３５个猪场的４１４份猪血清进行了ＰＲＶ抗体检测,并与ＳＮＴ检测结果进行了对比,结果在ＳＮＴ检测为阳笥的１７１份血清中,ＬＡ 相似文献
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A study of pseudorabies virus (PRV)-vaccinated pigs comparing the immune responses detected by the latex agglutination test (LAT) with responses detected by other routine tests for pseudorabies antibodies indicated that LAT was more sensitive than either the enzyme-linked immunosorbent assay (ELISA) or the serum virus neutralization test (SVNT). The LAT detected antibodies sooner than ELISA and SVNT in unvaccinated pigs after challenge with virulent PRV. The specificities of the 3 tests were found to be near 100%. The LAT is a good alternative to SVNT or ELISA for detection of PRV-specific antibodies. 相似文献
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Yong T Huan-chun C Shao-bo X Ya-li Q Qi-gai H Yu-qi R 《Veterinary research communications》2005,29(6):487-497
A 0.8 kb DNA fragment encoding the major epitope domain of glycoprotein E (gE) of pseudorabies virus (PRV) was inserted downstream
of the T7 promoter of an expression vector, pET-28b, to yield the recombinant plasmid pETgE804. After induction by isopropy1-β-D-thiogalactopyranoside
(IPTG), a high level expression of fusion protein was obtained. SDS-PAGE and western immunoblotting analysis showed that the
fusion protein was 38 kDa and could bind with antisera against PRV. The protein existed mainly in the form of the inclusion
body. After being denatured and renatured, the protein was used to prepare the latex antigen. The concentration of antigen,
temperature and time for sensitization were optimized. The latex agglutination test (LAT) was able to differentiate sera of
PRV-infected pigs from those of gE-deletion vaccine-immunized pigs. The diagnostic specificity and sensitivity of the developed
gE latex agglutination test (gE-LAT) were also evaluated by using sets of sera. The diagnostic specificity and diagnostic
sensitivity of the gE-LAT were 96.77% and 95.76%, respectively. For comparison between gE-LAT and a commercial blocking enzyme-linked
immunosorbent assays (ELISA), 260 serum samples were tested. The coincidence frequency of both assays was 96.94% (252/260).
No significant difference was found between the two methods (p>0.05). For comparison between the abilities of gE-LAT and gE-ELISA to detect sera with low titres of gE-specific antibody,
66 sera from 22 pigs were tested. The data indicate that the gE-LAT is of similar sensitivity to gE-ELISA. These results indicate
that gE-LAT using recombinant gE might be very useful as a routine screening method for the differential diagnosis of PRV
infection. 相似文献
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重组M蛋白-乳胶凝集试验检测PRRS病毒血清抗体的研究 总被引：19，自引：0，他引：19
利用纯化的 PRRS病毒重组 M蛋白致敏乳胶制成乳胶抗原 ,成功地建立了一种检测 PRRS病毒血清抗体的乳胶凝集试验 (L AT)诊断方法。用制备的乳胶 M抗原分别检测猪瘟、猪伪狂犬病、猪细小病毒病、猪弓形体病、猪衣原体病、猪乙型脑炎阳性血清 ,结果均为阴性 ,无交叉反应 ,说明建立的 L AT方法具有良好的特异性。用建立的乳胶凝集试验方法与国外IDEXX公司 PRRS病毒抗体检测试剂盒同时对 76份猪血清样本进行检测 ,结果表明建立的 L AT方法的特异性和敏感性均为 95 % ,两种方法的总符合率为 87% ,检出率基本一致。研究结果表明 L AT方法具有操作简便、快速、敏感性高、特异性强、价格低廉且可用于现场检测等优点 ,是一种适合基层兽医单位用于 PRRS病毒血清抗体检测的新方法 相似文献
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本研究旨在建立变异伪狂犬病病毒FJ-2012株gC蛋白抗体间接ELISA检测方法,掌握不同猪场猪群的gC抗体水平情况。将FJ-2012株gC基因连接至pCzn1载体,转染至Arctic express(DE3)感受态细胞,IPTG诱导表达产物经SDS-PAGE和Western blot验证,通过矩阵法试验、临界值的确定、特异性试验、重复性和敏感性试验,建立PRV-gC抗体间接ELISA检测方法,并对源于不同猪场的280份血清进行PRV-gC抗体检测。结果表明,成功表达获得FJ-2012株pCzn1-gC重组蛋白;建立的间接ELISA方法的最佳抗原包被浓度为10 μg·mL-1和最佳样品血清稀释比例为1∶50,阴性和阳性判定的OD650 nm临界值为0.406~0.438,介于之间的判定为可疑;临床检测结果显示,120份盲样猪血清PRV-gC抗体阳性率为91.67%、PRV-gB抗体阳性率为95.00%,两种抗体检测结果的整体符合率为95.83%;PR不稳定的猪场血样PRV-gC抗体阳性率为96.25%(77/80),而PRV已净化的种猪场血样PRV-gC抗体阳性率为78.75%(63/80)。因此,建立的PRV变异株gC抗体间接ELISA检测方法为临床猪血清抗体检测提供了特异、灵敏和稳定的技术,也为开展变异PRV血清学调查奠定基础。 相似文献
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An indirect enzyme linked immunosorbent assay (ELISA) procedure was evaluated against the serum neutralisation test (SNT) for the detection of antibodies to infectious bovine rhinotracheitis virus (bovine herpesvirus type l), using 2028 sera from 166 dairy and 172 beef cattle herds. The results showed the ELISA to give high levels of agreement with the SNT in classifying positive and negative sera (98% and 97% respectively). Such disagreements as did occur involved weakly reactive sera with SNT titres of % or less. A number of sera (n=123) with trace neutralising activity of doubtful diagnostic significance were found to give marginal reactivity with ELISA. ELISA absorbance values were found to be highly correlated with SNT titres (r=0.909) on an overall basis, though agreements were lower with individual sera. The ELISA procedure was quicker, cheaper, and detected more reactors than the SNT. It also allowed results to be obtained with a number of sera which were unsuitable for testing by SNT because of their cytotoxic nature. Analysis of ELISA results showed reactors to be present in 57% of tested sera, representing 81% of cattle herds. Reactor rates for sera and herds in the South Island, (37% and 58%), were significantly lower than for those in the North Island (64% and 88%). Antibody prevalence was also found to be significantly lower in districts having a low annual rainfall (<850 mm), and to be lower in beef cattle than in dairy cattle. A surprising exception to the latter occurred in low rainfall districts, where dairy cattle showed significantly lower reactor rates than local beef animals. 相似文献
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The serum neutralisation test (SNT) and the indirect enzyme-linked immunosorbent assay (ELISA) for Aujeszky's disease were compared, utilising 3202 sera from Aujeszky's disease free pig herds, and 304 SNT reactor and 245 non-reactor sera from Aujeszky's disease infected piggeries. ELISA was found to give good discrimination between positive and negative sera, results showing 96.9% and 99.7% agreement with the SNT in classifying positive and negative reactor pigs respectively. The ELISA appeared to detect a slightly higher proportion of reactors than did the SNT. Absorbance values obtained with ELISA showed a high degree of overall correlation with SW titres (r = 0.916), though correlations were lower when applied to individual sera. The ELISA was considered to be a rapid and convenient procedure, offering many advantages over the SNT for routine use. 相似文献
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A rapid semi-quantitative latex agglutination test (LAT) has been standardized for the detection of leptospiral antibodies in serum samples of man and animals. The efficacy of the LAT was compared with the plate enzyme linked immunosorbent assay (ELISA). A total of 276 human serum samples were analyzed by both LAT and ELISA and percentage positives were 84.8 and 85.9%, respectively. Similarly, of 65 animal samples tested, 63.1 and 69.2% positivity were observed in LAT and ELISA, respectively. Even though the ELISA test was slightly more sensitive than LAT, the rapidity, simplicity and economics of the LAT were found to fulfill the requirements of a screening test for leptospiral antibodies. 相似文献