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本研究人工合成禽流感病毒H5N1亚型M2蛋白的膜外区(M2e),并偶联至半抗原载体血蓝蛋白(KLH),免疫SPF鸡,共免疫3次,每次间隔两周。所获得的阴阳性血清用于ELISA方法的建立,通过方阵滴定确定了人工合成的23肽包被96孔ELISA板的最佳浓度为5μg/mL;1%BSA为封闭液,37℃封闭3 h;被检测血清的最佳稀释度为1∶400,一抗反应时间为37℃,45 min;二抗反应时间为37℃30 min;选用TMB为底物,显色15 min,用2 mol/L H2SO4为终止液为检测血清中抗M2e抗体滴度奠定基础。根据建立的ELISA方法,检测3次免疫2周后的SPF鸡血清中抗M2e抗体,血清开始1∶100倍稀释之后做倍比稀释,测得平均滴度分别为1∶13 500和1∶20 500。 相似文献
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REV重组env蛋白间接ELISA诊断试剂盒的研制 总被引：1，自引：0，他引：1
以纯化的env蛋白为包被抗原,建立了检测REV抗体的间接ELISA（ienv-ELISA）方法。ienv-ELISA工作条件优化结果表明,最佳包被液为CB;最佳封闭液浓度为1%BSA-PBS;最佳抗原包被量为8μg/mL;血清最佳稀释度为1∶300;血清最佳作用时间为1 h;二抗的最佳稀释度为1∶5000;二抗最佳作用时间为1 h;底物最佳显色时间为25 min。重复性试验、特异性试验和对比试验结果显示,建立的ienv-ELISA方法有良好的可重复性,标准差均小于15%;与鸡MDV、ALV、NDV、H5N1、H9N1等病毒阳性抗体均无交叉反应;与REV抗体检测试剂盒（以REV全病毒为包被抗原）对比,所建立的ienv-ELISA诊断敏感性、诊断特异性以及准确率分别为90.625%9、3.75%和92.7%。 相似文献
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《中国动物传染病学报》2016,(2)
本研究利用原核表达并纯化的重组蛋白pCold TF-HA1作为包被抗原,建立欧洲禽源H1N1亚型猪流感病毒抗体的间接ELISA检测方法。通过反应条件的优化,确定了间接ELISA最佳工作条件:抗原最佳包被浓度为800 ng/孔,血清稀释度为1:200,封闭时间为1 h,一抗血清最佳作用时间为2 h,酶标二抗最佳稀释度为1:40 000,二抗最佳作用时间为1 h,TMB显色时间为7 min。阴/阳性血清的判断结果分别为OD_(450)≤0.255和OD_(450)≥0.292,介于两者之间为可疑。符合性试验结果显示,建立的间接ELISA方法与血凝抑制(haemagglutination inhibition,HI)检测的阳性率分别为53.27%和49.53%,两者总复合率达96.27%。特异性试验结果显示,该方法与古典H1N1亚型和H3N2亚型猪流感阳性血清无交叉反应。通过重复性试验表明,同一批制备的重组蛋白包被96孔酶标板,检测OD_(450)值的批内变异系数为1.97%~7.85%,批间变异系数为1.94%~6.93%。总之,本研究建立的禽源H1N1亚型猪流感病毒抗体间接ELISA方法,具有敏感性较高、特异性强、重复性好的特点,为猪流感抗体检测提供了一种准确、快捷、简便、有效的技术手段,可用于禽源H1N1亚型猪流感抗体检测和流行病学调查。 相似文献
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为建立骆驼斯氏副柔线虫病间接ELISA(iELISA)诊断方法,本试验对骆驼斯氏副柔线虫半胱氨酸蛋白酶CPR基因进行重组表达,将获取的重组蛋白(rCPR)进行纯化和Western blotting检测,然后以纯化好的重组蛋白为抗原,通过棋盘滴定试验优化了抗原包被浓度、包被条件、抗体稀释度、酶标二抗稀释度、封闭液和封闭时间等,建立了骆驼斯氏副柔线虫病iELISA诊断方法,并对建立的iELISA检测方法进行了重复性、敏感性、特异性试验和临床检测。结果显示,抗原最佳包被浓度为8μg/孔,血清最佳稀释度为1∶50,酶标二抗最佳稀释度为1∶5 000,最佳包被条件为4℃包被过夜,最佳封闭条件为3%BSA封闭2 h。临界值为0.235,待检血清D_(450 nm)值0.235则确定为阳性。重复性试验中变异系数均10%,重复性较好;用该方法检测阳性血清的敏感性为96.3%;此方法仅与骆驼斯氏副柔线虫病阳性血清发生特异性反应,与感染了其他寄生虫的阳性血清无交叉反应,特异性为100%;对140份临床血清进行检测,阳性率为86.4%。综上可知,本试验成功建立了一种快速有效诊断骆驼斯氏副柔线虫病的iELISA方法。 相似文献
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提取A型鼻气管鸟杆菌(ORT)外膜蛋白,经纯化后包被反应板,通过方阵滴定确定最佳抗原包被浓度、血清稀释倍数、兔抗鸡酶标二抗稀释倍数,建立了检测ORT抗体的间接ELISA方法.经方阵滴定确定最佳抗原包被质量浓度为11.85 mg/L,血清样品稀释倍数为1∶20,兔抗鸡IgG辣根过氧化物酶结合物最佳稀释倍数为1∶1 000,抗原抗体最佳结合时间为1 h,血清与二抗最适反应时间为45 min.试验结果确定的判定标准为:样品D490 nm≥0.639判定为阳性,D490 nm≤0.350判定为阴性,介于两者之间的为可疑.试验证明该方法具有良好的稳定性、重复性和特异性,将205份疑似ORT的鸡血清用本方法进行检测,其阳性检出率为11.7%(24/205). 相似文献
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谢芝勋 秦宇 谢丽基 刘加波 邓显文 庞耀珊 谢志勤 唐小飞 XIE Zhi-xun QIN Yü XIE Li-ji LIU Jia-bo DENG Xian-wen PANG Yao-shan XIE Zhi-qin TANG Xiao-fei 《畜牧与兽医》2007,39(11):3-7
将表达的禽呼肠孤病毒(ARV)σ3融合蛋白纯化后作为抗原,建立了检测ARV抗体的间接ELISA方法,并对ELISA的反应条件进行了摸索,确定了抗原的最适包被浓度为3.98μg/mL,检测血清最适稀释倍数为1∶200,血清与抗原反应最佳反应时间为37℃作用2h,酶标二抗最佳作用时间为37℃作用1h,底物的最佳显色时间为25min。包被的抗原不与新城疫病毒、H5亚型禽流感病毒、传染性法氏囊病毒等阳性血清发生交叉反应。用该方法建立的ELISA诊断方法,具有很好的敏感性和特异性,为ARV的诊断和检测以及血清学调查提供良好的技术手段。 相似文献
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为建立检测副猪嗜血杆菌(H.parasuis)抗体方法,本研究以H.parasuis外膜蛋白Omp16为包被抗原建立了检测H.parasuis的间接ELISA方法。反应条件经优化为:抗原包被浓度为1μg/m L,血清稀释度为1:80;血清与抗原最佳作用时间为40 min,二抗稀释10 000倍,与一抗孵育30 min;TMB作用时间为30 min。利用该ELISA方法检测H.parasuis、胸膜肺炎放线杆菌、大肠杆菌和猪链球菌2型等血清,除H.parasuis为阳性外其余均为阴性,表明其特异性强。该ELISA方法可检测到最高稀释度为1∶512的阳性血清,敏感性高。重复性试验显示,其批内和批间的重复试验变异系数(CV)分别在3.62%~8.97%和4.3%~9.50%。该ELISA检测方法与进口ELISA试剂盒的阳性符合率、阴性符合率和总体符合率分别为87.8%,90.7%和88.6%。本研究建立的间接ELISA方法,为H.parasuis血清流行病学调查及疫苗免疫评价等提供了重要手段。 相似文献
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为建立鹅圆环病毒(GoCV)抗体的检测方法,本研究通过原核表达重组核衣壳(Cap)蛋白,将纯化的该重组蛋白作为ELISA检测的包被抗原,利用交叉反应性,以羊抗鸡IgG(HRP-IgG)作为二抗,经反应条件的优化,建立了检测鹅血清GoCV抗体的间接ELISA方法。确立的ELISA反应最适条件为:抗原包被浓度为2.05μg/mL,待检血清稀释度为1∶50,HRP-IgG稀释度为1∶2000,待测血清和二抗均于37℃反应1.5h,底物于室温显色10 min。经38份阴性血清检测确定阴阳性临界值为0.25。特异性试验结果显示,该方法与大肠杆菌、新城疫、禽流感H5和H9、小鹅瘟、鹅副粘病毒抗原阳性血清均无交叉反应;重复性试验结果显示,其批内和批间变异系数均小于10%。应用该方法检测了从4群GoCV PCR检测阳性种鹅群采集的血清,结果显示其血清阳性率在60.0%～90.9%。本实验建立的间接ELISA方法具有较好的特异性和重复性,为进一步开展GoCV流行病学调查提供了一种便捷可靠的手段。 相似文献
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以纯化的大肠埃希菌K88菌毛蛋白为包被抗原,建立了检测大肠埃希菌K88IgG抗体的间接ELISA方法。确定了间接ELISA的最适反应条件,即最佳抗原包被浓度为1μg/mL,兔抗体稀释倍数为1∶10,猪抗体稀释倍数为1∶100,确定最佳封闭液为50g/L脱脂奶粉,最佳封闭时间为0.5h,血清反应时间0.5h,二抗反应时间1h,底物室温反应时间为15min,阴阳性临界值兔血清为0.33、猪血清为0.45。证实该间接PPA-ELISA方法特异性强、重复性好、敏感度高,可以作为疫苗效力检验和流行病学调查的参考方法。 相似文献
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In the horse, conventional inactivated or subunit vaccines against equine influenza virus (EIV) induce a short-lived antibody-based immunity to infection. Alternative strategies of vaccination have been subsequently developed to mimic the long-term protection induced by natural infection with the virus. One of these approaches is the use of immune-stimulating complex (ISCOM)-based vaccines. ISCOM vaccines induce a strong antibody response and protection against influenza in horses, humans, and a mouse model. Cell-mediated immunity (CMI) has been demonstrated in humans and mice after ISCOM vaccination, but rarely investigated in the horse. The aim of this study was to evaluate EIV-specific immune responses after intra-muscular vaccination with an ISCOM-EIV vaccine (EQUIP F) containing both equine influenza H7N7 (A/eq/Newmarket/77) and H3N8 (A/eq/Borl?nge/91 and A/eq/Kentucky/98) strains. The antibody response was measured by single radial haemolysis (SRH) assay using different H3N8 EIV strains. Stimulation of type-1 immunity was evaluated with a recently developed method that measures EIV-specific IFNgamma synthesis by peripheral blood lymphocytes (PBL). The protective efficacy of this ISCOM-based vaccine against challenge infection with a recent equine influenza (H3N8; A/eq/South Africa/4/03) strain was also evaluated. Vaccinated ponies developed elevated levels of EIV-specific SRH antibody and increased percentage of EIV-specific IFNgamma(+) PBL, whereas these responses were only detected after challenge infection in unvaccinated control ponies. Vaccinates showed minimal signs of disease and did not shed virus when challenged shortly after the second immunisation. In conclusion, evidence of type-1 immunity induced by an ISCOM-based vaccine is described for the first time in horses. 相似文献
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J A Appleton L F Gagliardo D F Antczak J C Poleman 《Veterinary immunology and immunopathology》1989,23(3-4):257-266
Peripheral blood leucocytes from a pony previously exposed to equine influenza virus (H3, N8) and vaccinated with killed virus (H3, N8 and H7, N7 subtypes) were cultured in vitro with live A/equine/Prague/56 (H7, N7). On the sixth day of culture, cells were harvested and fused with mouse myeloma cells (X63-Ag8.653). From this fusion, one hemagglutinin specific, equine IgG monoclonal antibody secreting hybridoma was identified and cloned twice by limiting dilution. The antibody inhibited hemagglutination by nine H7 equine influenza virus isolates obtained over a 21-year period, but did not inhibit A/equine/Miami/63 (H3, N8), or A/PR/8/34 (H1, N1). The neutralizing titer of hybridoma induced, nude mouse ascitic fluid was 10(-4.5) when tested in eggs against 100 egg infective doses (EID50) A/equine/Prague/1/56. The hybridoma continued to synthesize antibody during more than 4 months in continuous culture. 相似文献
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为建立一种快速、有效的检测马流感病毒(Equine influenza virus,EIV)的方法,以EIV中国分离株A/马/新疆/07(H3N8)制备的多克隆抗体为捕获抗体,原核表达的核蛋白(NP)制备的单克隆抗体为检测抗体,在国内首次建立了检测EIV的双抗体夹心ELISA方法.用该检测方法分别检测EIV、马动脉炎病毒、马疱疹病毒1型、马疱疹病毒4型和马乙型脑炎病毒阳性样品.结果表明,该ELISA方法具有良好的特异性;与常规检测EIV的血凝试验相比,其敏感性是后者的2.5～10倍;同时与H7N7亚型EIV有交叉反应.攻毒试验结果表明该方法可有效检测鼻腔分泌物中的EIV.该方法的建立为EIV的检测及早期防控提供了有效工具. 相似文献
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Detection of antibodies to the nonstructural protein (NS1) of influenza A virus allows distinction between vaccinated and infected horses. 总被引：19，自引：0，他引：19
Antibodies to the nonstructural protein (NS1) of A/equine/Miami/1/63 (H3N8) influenza virus were detected exclusively in the sera of mice experimentally infected with A/Aichi/2/68 (H3N2) and horses infected with A/equine/Kentucky/1/81 (H3N8) or A/equine/La Plata/1/93 (H3N8), but not in those of the animals immunized with the inactivated viruses, by enzyme-linked immunosorbent assay (ELISA) using a recombinant NS1 as antigen. The results indicate that the present method is useful for serological diagnosis to distinguish horses infected with equine H3 influenza viruses from those immunized with the inactivated vaccine. 相似文献
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Saikat Boliar Wlodek Stanislawek Thomas M Chambers 《Journal of veterinary diagnostic investigation》2006,18(3):264-267
The hemagglutination inhibition test is used by many diagnostic and surveillance laboratories for detection of antibodies to influenza viruses. It is well known that the hemagglutination inhibition test is affected by nonspecific inhibitors present in equine serum. Several serum treatments are in use to remove these inhibitors, including treatment with kaolin. Discrepant results were observed in the authors' laboratories when using kaolin treatment before testing equine sera for antibodies against equine influenza virus (EIV) subtype-1 (H7N7). It is demonstrated here that kaolin treatment leads to false positive results when testing for antibodies against EIV subtype-1, as compared to other standard serum treatments (trypsin-periodate, receptor-destroying enzyme). Against EIV subtype-2 (H3N8), however, false positive results were not evident. Trypsinperiodate and receptor-destroying enzyme (RDE) treatments appear to be superior to kaolin for removal of nonspecific inhibitors from equine serum and should be used for serological diagnosis and surveillance of equine influenza virus. 相似文献
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Karin Aharonson-Raz Irit Davidson Yael Porat Amira Altory Eyal Klement Amir Steinman 《Journal of Equine Veterinary Science》2014
Equine influenza and equine rhinopneumonitis are among the Office International des Epizooties or the World Organisation for Animal Health notifiable, contagious respiratory diseases. Although vaccination of horses in Israel against equine influenza virus (EIV) and against equine herpesvirus (EHV) is routinely performed, information regarding the occurrence and the epidemiology of the diseases is lacking. We hereby attempt to determine seroprevalence and rate of infection for EHV-1 and 4 and for EIV in horses distributed throughout Israel and describe demographic and environmental risk factors associated with seroprevalence. Despite the fact that last reported isolation of EIV in Israel occurred in 2007, we found a 26.4% (29/110) (95% confidence interval [CI]: 18.18–34.62) seroprevalence for H3N8, a 16.4% (18/110) (95% CI: 9.49–23.31) for H7N7, and a 6.4% (7/110) (95% CI: 1.83–10.97) rate of seroconversion for H3N8, suggesting current and active circulation of EIV in horses in Israel. Age, housing management type, and type of farm activity were significantly associated with seroprevalence, with activities allowing exposure to new horses positively associated with seroprevalence to EIV and an only pasture housing management negatively associated with seroprevalence. No association was detected between other demographic variables (gender, breed, and color) and environmental factors (climatic regions). Seroprevalence to EHV-1 and 4 were very low (<1%) and very high (>99%), respectively, raising questions regarding the appropriate vaccination guidelines. Our findings of the occurrence of EIV in horses in Israel imply an underdiagnosis of this virus in this country and warrant further investigation as to the strains that circulate in this region and their accordance with the current vaccine strains. 相似文献
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Muhammad Sajid Mansur-ud-Din Ahmad Muhammad Athar Khan Muhammad Aftab Anjum Muhammad Hassan Mushtaq 《Tropical animal health and production》2013,45(2):693-694