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1.
根据GenBank发表的鸭源新城疫病毒SDWF02株NP基因序列,设计并合成1对特异性引物,扩增出鸭源新城疫病毒的NP基因,与原核表达载体pET-28a构建重组质粒pET28a-NP,经鉴定后转化Rosetta感受态细胞,经IPTG诱导,SDS-PAGE和Western-blot分析表明,54 000的融合蛋白得以表达,该蛋白能与鸭源新城疫的阳性血清发生特异性的反应.以纯化的重组蛋白为包被抗原,建立检测鸭源新城疫抗体的间接ELISA方法,经方阵滴定确定最佳包被质量液为pH9.6的碳酸盐缓冲液,最佳包被质量浓度为10 ng/孔,血清最佳稀释度为1∶1 000.经应用试验表明该方法具有良好的特异性、可重复性和敏感性,为临床检测鸭源新城疫抗体水平提供了一种简单、准确、快速的诊断方法.  相似文献   

2.
《中国兽医学报》2017,(10):1886-1890
为建立基于重组外膜蛋白A的检测禽源多杀性巴氏杆菌抗体的间接ELISA方法,扩增去除信号肽的外膜蛋白A(outer membrane protein A,OmpA)基因,定向克隆到载体pET32a,构建重组表达质粒pET32a-PmOmpA,转化至Escherichia coli BL21(DE3)以IPTG进行诱导,通过镍离子亲和层析纯化重组蛋白,进行SDS-PAGE和Westernblotting分析。以重组蛋白为包被抗原建立间接ELISA方法,方阵滴定法确定其最佳包被浓度和血清的最佳稀释度。结果,重组蛋白能与阳性血清发生良好的免疫反应。重组蛋白的包被浓度为4mg/L,血清的最佳稀释度为1∶80。SPF鸡的新城疫、鸡白痢和大肠杆菌病阳性血清,隔离饲养的番鸭鸭瘟、鸭病毒性肝炎和鸭疫里默氏菌病阳性血清,用该方法检测均为阴性。板内变异系数和板间变异系数均小于10%。ELISA方法的敏感性比直接凝集试验高出80倍以上。以重组外膜蛋白A建立的ELISA方法具有良好的特异性、重复性和敏感性,可以用于禽霍乱感染性抗体的检测,也可用于禽霍乱灭活苗和荚膜疫苗免疫效果的检测。  相似文献   

3.
为建立一种方便、快捷的鸭源鸡杆菌血清抗体诊断方法,通过用鸭源鸡杆菌YT-1株制备抗原,然后免疫健康家兔制备阴阳性血清,建立了鸭源鸡杆菌平板凝集检测方法,并进行特异性试验,确定抗原最佳工作浓度,同时用该方法进行临床样品检测。结果显示：鸭源鸡杆菌染色抗原与鸡源阳性血清产生明显凝集,而与鸡源阴性血清以及鸡大肠杆菌、鸡沙门氏菌、副鸡嗜血杆菌、禽流感病毒、鸡新城疫病毒、鸡传染性支气管炎病毒和禽腺病毒等病原的阳性血清均不凝集;当抗原浓度为5×109 CFU/mL时,抗原与血清凝集最佳。结果表明,建立的鸭源鸡杆菌血清抗体平板凝集试验方法具有良好的特异性,可用于开产前后鸡群鸭源鸡杆菌的检测评估及流行病学调查。  相似文献   

4.
本研究建立了检测鸭疫里默氏杆菌（Rimerrlla anatipestifer,RA）抗体的全菌体抗原间接ELISA方法,最佳血清稀释倍数为1：100。以RA1的甲醛灭活全菌体为包被抗原,棋盘滴定法试验确定其最适抗原包被浓度为5×10^8CFU／mL。与全菌体裂解抗原和重组P25蛋白为包被抗原的间接ELISA方法相比较,三者均可检测不同血清型RA标准阳性血清,结果符合性良好。用该方法检测雏鸭接种鸭疫里默氏杆菌蜂胶灭活疫苗后血清抗体水平的变化,发现免疫后10天抗体水平开始上升,二免后10天抗体水平达到峰值。  相似文献   

5.
根据GenBank中登录的鸭疫里默氏杆菌ompA基因序列,设计合成了2对引物,外引物的扩增基因片段大小为470bp,内引物的扩增基因片段大小为249bp,建立了适合RA快速检测的套式PCR方法。采用该方法对鸭疫里默氏杆菌进行了检测,能扩增到249bp的条带,而鸭源大肠杆菌、鸭源沙门菌、鸭源巴氏杆菌、鸭源金黄色葡萄球菌的扩增结果均为阴性。该方法第1次扩增的敏感性是10pg,第2次扩增的敏感性是100fg,第2次比第1次扩增的敏感性高100倍。该检测方法表明,所建立的套式PCR方法比常规PCR方法敏感性高,具有重复性好、特异性强和敏感性高等优点,可用于鸭疫里默氏杆菌的临床诊断、病料检测和分子流行病学调查等。  相似文献   

6.
利用鸭源鸡杆菌YU-PDS-RZ-1-SLG分离株制备超声波裂解抗原,建立了可以检测鸭源鸡杆菌多个血清型抗体的间接ELISA方法。包被抗原质量浓度为10mg/L,包被条件为37℃2h,再4℃过夜;封闭液为1%明胶,封闭条件为37℃1h;阴、阳性血清最佳稀释度为1∶100,酶标二抗工作滴度为1∶1 000;底物显色时间为15min。经交叉性试验、阻断试验和重复性试验证实建立的ELISA方法重复性好,特异性强。板内变异系数为2.01%～5.75%,板间变异系数为2.43%～6.20%。间接ELISA方法的灵敏度是微量凝集试验的25～100倍。利用所建立的ELISA方法检测了人工感染鸭源鸡杆菌的4日龄SPF鸡在感染后不同阶段感染组、同居组和空白对照组的血清抗体,并根据感染后不同阶段所测D450值绘制抗体消长曲线,其抗体水平在感染后32～47d开始上升,60d时达到高峰,但维持时间较短,2周后迅速下降。建立的间接ELISA方法可以用于临床病例的血清学快速检测,为进行鸭源鸡杆菌的血清流行病学调查提供了手段。  相似文献   

7.
为建立特异性和敏感性较高的鸭坦布苏病毒(DTMUV)抗体检测方法,采用原核表达系统对DTMUV E蛋白的DⅢ结构域进行了双串联融合表达,SDS-PAGE电泳结果显示目的蛋白大小约25 Ku。Western blot结果显示,经亲和层析纯化的重组蛋白能与DTMUV阳性血清发生特异性反应。以纯化的重组DⅢ蛋白作为包被抗原,初步建立了检测DTMUV血清抗体的间接ELISA方法。采用梯度稀释法对ELISA各种反应条件进行优化,确定最适工作条件。重组抗原最适包被浓度为5μg/mL,血清的最佳稀释度为1∶100,兔抗鸭酶标抗体最适稀释度为1∶1000;抗体临界值S/P≥0.336判定为阳性,S/P≤0.287判定为阴性,介于两者之间为可疑。该方法检测禽流感病毒、鸭源新城疫、鸭甲肝病毒、鸭圆环病毒、鸭细小病毒、经典呼肠孤病毒及新型鸭呼肠孤病毒等血清均为阴性,4个批次批内与批间重复试验的OD值变异系数分别为6.21%~7.27%和3.4%~7.2%,显示该法具有很好的特异性、稳定性和重复性。用建立的间接ELISA与中和试验分别对108份疑似鸭坦布苏病血清样品进行检测,两种方法的阳性符合率为83.3%。  相似文献   

8.
以鸭疫里默氏杆菌血清1型（RA1）基因组文库中筛选获得的一种“保守假定蛋白P25”基因的重组表达产物为包被抗原，建立了检测RA血清抗体的间接ELISA。诱导表达的重组P25蛋白纯化后进行包被，十字交叉滴定试验确定，此ELISA的最适抗原包被浓度为0．6μg／mL，血清最佳稀释度为1：64，与大肠杆菌、多杀性巴氏杆菌感染鸭血清无交叉反应。以RA1的P25为包被抗原对RA2、5、8、10血清型的标准分型血清和经临床剖检诊断的病鸭血清进行检测，其结果均为阳性。以RA1型的P25基因设计的特异性引物分别扩增出了RA2、5、8、10的P25基因。所扩增的P25基因的核苷酸序列及其编码的氨基酸序列和抗原表位在这些不同血清型间高度保守，提示此P25蛋白是各种血清型RA间的共同抗原，所建立的ELISA可以用于检测不同血清型RA的感染。  相似文献   

9.
为建立鸭疫里默氏杆菌(Riemerella anatipestifer,RA)间接酶联免疫吸附试验(ELISA)方法,以RA贵州分离株RAG06基因组为模板扩增并克隆鸭疫里默氏杆菌OmpA基因,构建pET32a-OmpA重组原核表达质粒,转化大肠杆菌BL21(DE3)感受态细胞,重组菌经诱导、超声、纯化后,通过SDS-PAGE和Western blotting分析鉴定获得OmpA重组蛋白大小约57 KD;以OmpA重组蛋白为包被抗原初步建立ELISA方法并优化,经多次方阵检测结果显示,OmpA蛋白以2.243 mg/mL的浓度进行包被,血清以1∶100稀释,抗原包被条件为4℃过夜、封闭条件为37℃120 min、血清反应时间为37℃60 min、酶标抗体工作浓度为1∶1000、酶标抗体反应时间为37℃60 min、显色时间为15 min为最佳条件。确定临界值为0.389。特异性试验表明RA阳性血清有较好反应外,其他血清均无明显反应。批内变异系数2.77%～8.00%,批间变异系数为1.10%～7.80%。当阳性血清稀释比例为1∶1600时,仍可判断为阳性,敏感性较高。应用该方法检测贵州...  相似文献   

10.
对布鲁氏菌黏附素SP41蛋白进行表达、纯化,以表达重组蛋白为包被抗原,建立了检测布鲁氏菌病绵羊血清抗体的间接ELISA方法。克隆布鲁氏菌SP41基因,PRC、酶切、测序鉴定正确后,构建pET-32a(+)-SP41原核表达载体,转化表达菌E.coliBL21(DE3),IPTG诱导表达重组SP41蛋白,纯化表达产物后包被酶标反应板,方阵滴定法进行最佳血清稀释度和最侍抗原浓度的筛选,结果显示重组蛋白SP41最佳抗原包被浓度为0.6mg/L,最佳血清稀释度为1:50。交叉试验、阻断试验、重复性试验表明,该方法重复性好、特异性强。利用此方法检测217份绵羊血清样本,结果表明该方法的阳性检出率要高于虎红平板试验和试管凝集试验。  相似文献   

11.
Riemerella anatipestifer, a gram-negative bacillus, is the causative agent of duck septicemia, a disease which could incur much economic loss in the duck industry. An indirect enzyme-linked immunosorbent assay (ELISA) has been developed to facilitate early detection of R. anatipestifer infection in ducks. The antigen used was a recombinant 41 kDa N-terminal fragment (rP45N') of a newly characterized R. anatipestifer potential surface protein, P45, which was expressed in Escherichia coli as an N-terminal GST fusion protein. The rP45N'-based ELISA successfully detected P45 antibodies in the sera of 20 ducks immunized with bacterin preparations of R. anatipestifer serotypes 1, 10 15, 19 and the ATCC11845 strain. Antibodies to P45 were also detected in the sera of 25% (75/296) of White Pekin ducks which were imported into Singapore from three different farms. Successful discrimination was obtained between sera from infected ducks and that of specific-pathogen free ducks (p<0.01). The rP45N'-GST antigen did not cross-react with antibodies in sera from guinea pigs which were infected with other gram-negative and gram-positive bacterial pathogens, including Aeromonas hydrophila, Citrobacter freundii, E. coli, Klebsiella pneumoniae, Pastuerella multocida, Proteus mirabilis, Salmonella spp., Serratia maccescens, Shigella sonnei and Yersinia enterocolitica. In addition, the DNA sequence encoding P45 was detected in R. anatipestifer serotypes 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 14, 15, 16, 17, 18, 19 and the ATCC11845 strain, suggesting that P45 is probably also universally expressed in these R. anatipestifer serotypes. Thus, the ELISA described is applicable to the detection of R. anatipestifer infection in ducks.  相似文献   

12.
1型鸭疫里氏杆菌OmpA蛋白间接ELISA方法的建立   总被引：1，自引：0，他引：1  
为建立检测1型鸭疫里氏杆菌(R.anatipestifer)的间接ELISA方法,本研究根据已发表的R.anatipestifer外膜蛋白A(ompA)基因序列(AF104937)设计引物,扩增1型R.anatipestifer HLG1株的ompA基因,构建重组质粒pHtb-ompA,转化大肠杆菌BL21(DE3),并利用IPTG进行诱导表达。SDS-PAGE和western blot结果表明,表达蛋白约为55 ku,具有良好的抗原活性。以纯化的OmpA为包被抗原建立间接ELISA并对条件进行优化。建立的ELISA具有良好的特异性、敏感性;与HLG1株菌体裂解蛋白为抗原的间接ELISA比较,符合率为91.3%。本研究建立的ELISA方法为R.anatipestifer的流行病学调查和SPF鸭的监测提供了快速、特异的血清学诊断方法。  相似文献   

13.
为了建立快速检测鸭出血症病毒(DHDV)的血清学方法,本试验利用浓缩纯化的DHDV作为包被抗原,建立了检测DHDV血清抗体的间接ELISA方法,并对各种检测条件进行了优化。试验结果表明,抗原最佳稀释浓度为7.06 μg/孔;最佳包被条件为37 ℃ 1 h后,4 ℃包被过夜;待检血清的最佳稀释倍数为1:25。在优化条件下,阴阳性临界值判定标准为0.44。建立的ELISA方法对鸭瘟病毒、鸭病毒性肝炎病毒、雏番鸭细小病毒和番鸭呼肠孤病毒阳性血清均无交叉反应,结果表明该方法具有良好的特异性。批内和批间重复性试验的最大变异系数分别为0.0221、0.0032,显示该方法具有很好的稳定性,与血清中和试验的符合率为100%。该方法快速、简单、特异性好、重复性好,可用于大批量监测鸭群DHDV血清抗体感染情况。  相似文献   

14.
A recombinant baculovirus (RBV) encoding the nucleoprotein (NP) of avian influenza virus (AIV) was generated and the appropriate protein was expressed in Sf9 cells. Purified recombinant NP and the NP-specific monoclonal antibody HB65 were used to establish a competitive ELISA (cELISA) system for the detection of NP-specific antibodies in sera of ducks, geese and wild birds. Tests to evaluate this method were carried out using sera of ducks experimentally infected with AIV, pre-immune duck and chicken sera, and poultry field sera, which tested negative in the haemagglutination inhibition (HI) assay, and field sera of several poultry species experimentally infected with other viruses. The evaluation of the test demonstrated a high sensitivity and specificity of this method. Tests carried out using field sera of duck and goose flocks revealed widely corresponding results obtained by HI assay and cELISA indicating that this test is applicable for flock diagnosis. Differing results were obtained for individual samples. It can be assumed that for the most part this was because of a better recognition of the conserved NP antigen by serum antibodies, although some results remained unclear.  相似文献   

15.
The generation of protective immunity against Riemerella anatipestifer infection in ducks were investigated by immunizations with recombinant glutathione sulfatransferase (GST) fusion's proteins of OmpA, a 42kDa major outer membrane protein, and P45N', a 41kDa N-terminal fragment of a newly identified 45kDa potential surface protein from R. anatipestifer. The DNA encoding OmpA and P45N' were isolated from R. anatipestifer serotype 15 (field strain 110/89) and serotype 19 (reference strain 30/90), respectively. Immunoblotting and ELISA results showed that the purified recombinant proteins induced the production of antibodies in immunized ducks. However, neither was protective against subsequent challenge with the virulent serotype 15 strain, 34/90. All the five ducks immunized with formalinized R. anatipestifer strain 34/90 survived the challenge with the homologous strain whereas six out of seven ducks in the non-immunized control group died within a week following the challenge.  相似文献   

16.
OmpA is a virulence factor of Riemerella anatipestifer   总被引：1，自引：0，他引：1  
Hu Q  Han X  Zhou X  Ding C  Zhu Y  Yu S 《Veterinary microbiology》2011,150(3-4):278-283
Riemerella anatipestifer infection is probably the most economically important disease of farm ducks worldwide. The pathogen R. anatipestifer causes septicemia anserum exsudativa in ducks, but little is known about the molecular basis of its pathogenesis and the virulence factors involved. In this study, by deleting ompA gene from R. anatipestifer serotype 2 strain Th4, we constructed a mutant strain Th4ΔompA to investigate whether R. anatipestifer OmpA is an important virulence factor. Results showed that although the growth curve, bacterial and colony morphology of Th4ΔompA in tryptic soybean broth (TSB) or on TSB agar were similar to its parent strain Th4, the adhesion and invasion capacities of mutant strain to Vero cells were decreased significantly. Furthermore, the median lethal dose (LD(50)) of both strains was determined to measure the virulence with 10-day-old Cherry Valley ducklings. The results showed that LD(50) of Th4ΔompA mutant was >10(10) colony forming units (CFU), it was attenuated significantly in comparison with that of Th4 which LD(50) was 4.41 × 10(8) CFU. Additional analysis indicated that blood bacterial loading of ducklings infected with the Th4ΔompA mutant were much lower than those of Th4-infected ducklings. The results demonstrate that OmpA is a virulence factor of R. anatipestifer, and that it may act as an adhesin.  相似文献   

17.
将鸭甲肝病毒鸡胚化弱毒MY株Vp1基因原核表达工程菌(pET32a+Vp1,BL21(DE3)PlysS)对基因Yp1进行大量表达和纯化,得到鸭甲肝弱毒MY株Vp1重组蛋白作为抗原制备亚单位疫苗,免疫雏鸭,用间接ELISA检测方法对免疫后抗体生成水平进行监测,并通过动物攻毒试验评价免疫保护效果.结果显示:Vp1重组蛋白免疫家兔后血清检测琼扩效价≥1∶64,细胞中和试验效价为1/45;雏鸭免疫后抗体生成水平呈明显上升趋势,对攻毒起到了保护作用.首次揭示了DHAV-1结构蛋白Vp1刺激机体产生抗体使雏鸭获得保护的能力.  相似文献   

18.
RT—PCR扩增鸭呼肠孤病毒（Duckreovirus,DRV）的dB基因,克隆到pET-32a（＋）表达载体,再转化大肠杆菌Transetta（DE3）;含有重组质粒pET—σB的大肠杆菌经IPTG诱导,获得大小为55000的以包涵体形式表达的σB重组蛋白。Westernblotting显示,σB重组蛋白能够与兔抗DRV多抗血清特异性结合。以高亲和NI—NTA树脂在变性条件下纯化、梯度尿素复性的σB重组蛋白为包被抗原,建立了检测DRV抗体的间接ELSIA方法。分别以间接ELSIA方法和血清中和试验对DRV感染鸭血清和SPF鸭血清进行检测,两者的符合率为100％。该间接ELSIA方法对鸭瘟病毒、鸭病毒性肝炎病毒和禽流感病毒阳性血清均无交叉反应。  相似文献   

19.
山东地区Ⅰ型鸭肝炎病毒分离鉴定及单克隆抗体的研制   总被引：1，自引：0，他引：1  
用SPF鸡胚从临床上疑似鸭病毒性肝炎(DVH)的商品肉仔鸭肝脏中分离得到一株病毒。该病毒能在96h内致死鸡胚,48h内致死鸭胚,死胚尿囊液无血凝性。RT-PCR和血清中和试验的结果表明,该病毒为Ⅰ型DHV。用该病毒免疫Balb/c小鼠,取免疫小鼠的脾细胞和骨髓瘤细胞SP2/0进行融合,以浓缩提纯后的该病毒为筛选抗原,通过间接ELISA法对杂交瘤进行筛选,经亚克隆后获得一株针对Ⅰ型DHV的特异性单克隆抗体,并对该株单克隆抗体的特性进行了鉴定。  相似文献   

20.
The current method to detect antibody titre against infectious bursal disease virus (IBDV) in chickens is based on enzyme-linked immunosorbent assay (ELISA) using whole virus as coating antigen. Coating the ELISA plates requires a purified or at least semi-purified preparation of virus as antigen, which needs special skills and techniques. In this study, instead of using whole virus, recombinant protein of hexahistidine tag (His 6 tag) and VPX protein of IBDV expressed in E. coli was used as an alternative antigen to coat the ELISA plates. There was a good correlation coefficient (R2 = 0.972) between the results of the ELISA using plates coated with monoclonal antibody against His 6 tag and those of the commercial IBDV ELISA kit. Hence, His 6 tag and VPX recombinant protein expressed in E. coli has the potential for the development of ELISA for the measurement of IBDV-specific antibody.  相似文献   

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