东莞地区犬接种狂犬病疫苗后抗体水平的检测

应用酶联免疫吸附试验(ELISA)对东莞市采集的809份犬血清进行检测,采用SYNBIOTICS软件进行分析.结果表明,抗体阳性数265份,抗体阳性率32.76%,其中检测免疫狂犬病多联苗的血清493份,抗体阳性数55份,抗体阳性率11.16%,检测免疫狂犬病单价疫苗的血清316份,抗体阳性数210份,抗体阳性率66.46%.     

松江区泖港镇犬狂犬病免疫抗体评价

应用酶联免疫吸附试验(ELISA)方法,2014-2017年有计划地对泖港镇326份犬血样进行狂犬病免疫抗体检测,共检出抗体合格血清268份,总抗体合格率为82.2%。结果表明4年来泖港镇犬狂犬病免疫抗体维持在相对平衡的水平,同时也反映出抗体水平的不稳定,应加大对犬狂犬病的免疫密度,加强免疫抗体的监测力度。     

上海地区犬类主要疫病血清学调查

为了解2016年本市犬类主要疫病免疫抗体水平和感染情况,收集上海地区16个犬类免疫点的486份犬血清,运用酶联免疫吸附试验(ELISA)开展了4种犬类主要疫病(犬瘟热、犬细小病毒病、犬流感、狂犬病)的免疫抗体和感染抗体检测,并按照年龄、体型、品种进行了区分。检测结果:狂犬病、犬瘟热和犬细小的免疫抗体合格率分别为72.02%、56.30%和90.16%,犬流感感染抗体阳性率为8.02%;年龄和体型会导致抗体水平的部分差异;非纯种犬较纯种犬的抗体水平高。     

ELISA与FAVN方法检测犬狂犬病抗体的比较

比较酶联免疫吸附试验(ELISA)与细胞培养病毒中和试验(FAVN)检测狂犬病疫苗免疫后血清抗体.将40只犬免疫兽用狂犬病疫苗后,第14 d静脉采血分离血清,分别采用ELISA法和国际贸易指定试验FAVN法检测血清样品,试验犬免疫第21 d攻击狂犬病毒BD06株.结果表明,两种方法检测结果差异不显著(p≥0.05,p=0.19),FAVN、ELISA法检测狂犬病抗体与攻毒试验结果的阳性符合率均为100%.     

山东日照市养猪场(户)伪狂犬病免疫效果监测

应用猪伪狂犬病抗体ELISA试验方法对山东省日照市8家养猪场(户)的280份血清样品进行实验室检测,以期了解日照市养猪场(户)伪狂犬病免疫效果。结果显示,免疫合格244份,合格率87.1%,猪伪狂犬病的抗体水平检测合格率在80%以上,能为猪群提供较好的保护。     

新疆兴和犬养殖场免疫血清抗体检测

应用进口狂犬病酶联免疫吸附试验（ELISA）抗体诊断试剂盒对采集新疆昌吉兴和犬养殖场28份2月龄以上犬血清进行狂犬病抗体检测,结果28份免疫血清中26份血清为抗体阳性,阳性率为92.8%。试验结果表明该犬养殖场总体免疫效果良好。运用此方法较简单、操作方便、灵敏度高,能及时有效地监控接种犬是否免疫成功,可减少免疫失败的发生。     

我国部分城乡犬狂犬病中和抗体水平调查

以国际兽疫局(OIE)推荐的荧光抗体病毒中和试验(FAVN)对随机采自广东、河北、北京等地区的573份犬血清进行了狂犬病病毒中和抗体效价的测定,以确定犬群中狂犬病的免疫状况。结果显示,在不同地区或不同城市的动物防疫区域中,犬体内狂犬病病毒中和抗体平均水平存在着明显的差异,城市犬的中和抗体水平较高,有的中和抗体保护水平(0.5IU/mL)阳性率高达100%,少数则达不到保护水平,不同防疫区域狂犬病中和抗体水平为(0.08±0.03)~(4.39±1.45)IU/mL,平均保护水平阳性率为46.3%;乡村看家犬病毒中和抗体水平普遍较低,大部分犬体内无中和抗体,只有个别犬体内存在水平较低的中和抗体,平均保护水平阳性率为1.8%。     

IHA与ELISA检测猪瘟病毒抗体的比较

应用间接血凝试验(IHA)和酶联免疫吸附试验(ELISA)检测猪瘟病毒抗体,IHA试验以1∶16为判定孔,抗体效价大于或等于1∶16为抗体阳性;ELISA试验以抗体阻断率40%为判定标准,阻断率大于或等于40%为抗体阳性,同步检测了122份规模化猪场不同阶段免疫猪血清.结果ELISA检测抗体阳性率比IHA检测抗体阳性率低,阴性、阳性相符的血清数为92份,相关性为 75.4%,不同抗体水平分布的血清数也不同,个别血清出现较大差异,卡方检验P值为0.13(＞0.05),两种检测方法统计上无差异,研究结果为选择猪瘟病毒抗体检测方法提供参考.     

2007-2009年河南省新乡市犬狂犬病灭活疫苗免疫效果调查

为了解犬狂犬病佐剂型灭活疫苗的免疫效果、保证免疫质量,采用ELISA方法对犬狂犬病抗体水平进行监测,在免疫后20～30d,采用犬狂犬病毒IgG抗体检测试剂盒,进行抗体水平抽样监测。共检测1119份犬血样,结果抗体水平合格的1100份,合格率为98.30%。     

东莞市2012～2016年犬狂犬病血清学调查

为了解近5年东莞市犬狂犬病免疫效果,在2012~2016年,对东莞市32个镇(街)采集了6271份犬血清样品,应用酶联免疫吸附试验,进行狂犬病抗体检测,抗体阳性率为80.07%,其中2012~2016年的抗体阳性率分别为87.59%、81.55%、80.50%、78.80%、71.55%。结果表明,东莞市犬狂犬病的免疫总体效果比较好,达到了OIE关于狂犬病的控制标准,但近2年来,犬狂犬病抗体水平有下降趋势,应引起重视,分析各种原因,确保防控成果。     

郑州市犬瘟热病毒感染血清学调查

为了解郑州市犬瘟热流行情况,为犬瘟热的预防提供参考依据。采用间接ELISA法对来自郑州市480份血清进行抗体水平的检测,结果显示480份犬血清中犬瘟热抗体平均阳性率为16.04%,其中3岁以下犬犬瘟热阳性率为13.13%,3岁以上犬犬瘟热阳性率为 2.91%。犬瘟热的发病率仍然很高,尤其是3岁以下的犬犬瘟热阳性率较为高,应引起高度重视,防止犬瘟热的传播。     

Development and comparison of serologic methods for diagnosing chicken anemia virus infection.

This paper describes the development of an indirect immunoperoxidase assay (IIP) and an indirect enzyme-linked immunosorbent assay (ELISA) for detecting antibodies to chicken anemia virus (VAC). The IIP assay developed used CAV-infected MDCC-MSB1 cells for detecting antibody to CAV, whereas the ELISA utilized gradient-purified immunoadsorbed CAV as the target antigen. The IIP and ELISA were compared with the standard indirect immunofluorescent antibody (IFA) assay, which is more conventionally used to screen chicken serum for antibodies against CAV. Comparative test results of 185 field samples of chicken serum by these three methods were in agreement 84% of the time. Both IFA and IIP assays yielded fewer positive tests than did the ELISA. IFA and IIP assays were in agreement 93% of the time, as compared with 91% agreement of IIP and ELISA results, or 84% agreement for comparative IFA and ELISA results.     

The modification of fluorescent antibody virus neutralization (FAVN) test for the detection of antibodies to rabies virus

The fluorescent antibody virus neutralization test (FAVN) for the detection of antibodies against rabies virus was modified by using a monoclonal anti-rabies antibodies and peroxidase anti-mouse conjugate instead of a fluorescent anti-rabies conjugate. The results were read on an automatic multi-channel spectrophotometer. A total of 182 serum samples from dogs were tested by both the original and modified FAVN methods and the results were compared. Good correlation was found between the two tests. Practically, the modified FAVN test was quicker and could be used for a larger number of samples.     

宁波地区家犬狂犬病流行及免疫保护情况调查

采用狂犬病抗体ELISA试剂,于2008、2009、2010年3年间,对宁波地区702份家犬血清进行跟踪检测。结果显示,宁波市家犬狂犬病综合抗体水平达到65.3%;在免疫后60 d与90 d时,总体抗体水平均保持在较高水平;宠物犬免疫抗体合格率优于农村犬;非免疫犬抗体检出率为15.3%,与近年来我市人的狂犬病发病率居高不下关系密切。     

Detection of canine distemper virus antigen in canine serum and its application to diagnosis

Canine distemper virus (CDV) antigen was detected in the serum of dogs by an ELISA and the results of this assay were compared with an anti-CDV immunoglobulin M (IgM) antibody test. In paired sera from 26 naturally infected dogs, the antigen-positive rate was 26.9 per cent at the first examination and 11.5 per cent at the second examination two to three weeks later. The antigen was detected in three of the 10 dogs which were negative for anti-CDV IgM antibody at the first examination. It could also be detected in the serum of between eight and two of 40 specific pathogen-free dogs vaccinated against CDV, for up to four weeks after they were vaccinated.     

Comparison of a commercial H1N1 enzyme-linked immunosorbent assay and hemagglutination inhibition test in detecting serum antibody against swine influenza viruses.

Recently a commercial enzyme-linked immunosorbent assay (ELISA) kit for detecting antibody against H1N1 swine influenza virus (SIV) has been made available to diagnosticians and veterinary practitioners. Because the hemagglutination inhibition (HI) test has been considered the standard test for SIV serology, diagnostic performance of the new ELISA was evaluated using positive (n = 60) and negative (n = 188) serum samples from young pigs with known status of SIV infection and compared with that of the HI test. Both ELISA and HI test identified all negative animals correctly. None of the serum samples (n = 64) from pigs inoculated with H3N2 SIV was positive by ELISA for SIV antibody. The H1N1 SIV antibody detectable by ELISA appears to develop more slowly in comparison with antibody detectable by HI test. Although antibody was detected by HI test in all inoculated animals (n = 20) by day 7 postinoculation (PI), antibody was detected by ELISA in 0%, 75%, and 100% of the inoculated animals on days 7, 14, and 28 PI, respectively. Discrepancy in test results between the 2 serologic tests appeared to be because of differences in antibody isotypes detected by each test. Enzyme-linked immunosorbent assay mainly detected IgG antibody, whereas the HI test detects IgM antibody very efficiently as well as IgG antibody. Collectively, the commercial ELISA is highly specific for antibody to H1N1 SIV but may not identify positive animals at the early stage of infection as effectively as the HI test, particularly when SIV is introduced to a na?ve swine population.     

伊氏锥虫变异表面糖蛋白抗原双抗体夹心ELISA检测方法的建立及初步应用

A double antibody sandwich ELISA for detection of Trypanosoma evansi variant surface glucoprotein (VSG) antigen was established by using two monoclonal antibodies against Trypanosoma evansi VSG antigen.The result of sensitivity showed when positive serum was diluted to 3200 doubles, its D_{450 nm} value was still greater than the critical value of positive and negative,and specificity test result showed that there was no cross reaction with the antigens of Theileria,Toxoplasma gondii,Chlamydia and Fasciola gigantica.82 clinical sera were detected by this double antibody sandwich ELISA and its positive rate was 9.76%.The experiment results demonstrated that this double antibody sandwich ELISA for detection of Trypanosoma evansi VSG antigen had good detecting sensitivity and specificity,and could be used as an effective method for clinical detecting buffalo Trypanosoma evansi disease.     

Evaluation of a commercial enzyme-linked immunosorbent assay for detection of Borrelia burgdorferi exposure in dogs

OBJECTIVE: To evaluate the effectiveness of a commercially available ELISA kit for detecting antibodies against Borrelia burgdorferi in dogs. SAMPLE POPULATION: Banked sera from 440 military working dogs were used for serologic analyses. PROCEDURE: Serum samples were analyzed for antibodies against B burgdorferi by use of a commercially available ELISA and subsequently by western blot analysis as a confirmatory test. RESULTS: Results from the ELISA indicated that 89 (20%) samples were positive for exposure to B burgdorferi or canine Lyme disease vaccine, and 351 (80%) were negative. Follow-up testing by western blot analysis indicated that results for 109 (25%) samples were positive and 331 (75%) were negative for exposure. All samples that had positive results on the ELISA also had positive results on western blot analysis (true positives). Of the 351 samples that had negative results on the ELISA, only 331 had negative results on western blot analysis (true negatives). The remaining 20 samples had positive results on western blot analysis. By use of a standard 2 x 2 table, it was determined that the ELISA had a sensitivity of 82%, specificity of 100%, positive predictive value of 100%, and negative predictive value of 94%. CONCLUSIONS AND CLINICAL RELEVANCE: The commercial ELISA kit evaluated in this study appeared to lack adequate sensitivity for detecting all potential cases of borreliosis in dogs. The ELISA was also unable to discriminate natural exposure from exposure attributable to vaccination, which could complicate interpretation of positive results and treatment of dogs with clinical signs.     

北京地区规模化奶牛场三种病毒性腹泻病的血清学调查

为了解近年北京地区奶牛腹泻性疾病的流行情况,采用酶联免疫吸附试验(ELISA)对北京地区密云、怀柔和昌平3个区县的未免疫接种牛病毒性腹泻病毒(Bovine viral diarrhea virus,BVDV)、牛冠状病毒(Bovine coronavirus,BCV)和牛轮状病毒(Bovine rotavirus,BRV)疫苗的31个规模化奶牛场的1 650份血清样品进行了BVDV、BCV、BRV感染抗体检测。结果显示,BVDV抗体平均阳性率为48.2%,BCV抗体平均阳性率为57.2%,BRV抗体平均阳性率为52.2%,BVDV、BCV及BRV感染在密云、怀柔和昌平3个区县的牛群中普遍存在,需进一步加强奶牛腹泻性疾病的综合防控。     

重组N蛋白抗原检测PRRSV抗体ELISA的研究Ⅱ.试剂盒阴阳性临界值的测定及其与IDEXX公司试剂盒的比较

对临床上采集的899份猪血清样本。用以纯化的重组N蛋白为包被抗原建立的检测猪繁殖与呼吸综合征病毒（PRRSV）抗体的间接ELISA进行检测．运用统计学方法摸清了检测结果的分布规律。并扣国外IDEXX公司PRRSV抗体检测试剂盒同时对460份血清样本进行检测。结果表明。2种方法的符合率为91．73％。利用TG—ROC软件确定了自制的ELISA酶标板（NP—ELISA）的临界值。并标定试剂盒的特异性扣敏感性均为92．6％。ELISA的结果判定标准是：当以血清样本L为标准参考阳性血清时，样品与阳性血清的比值（S／P）小于或等于0．4为阴性；S／P在0．4与0．5之间为可疑；S／P大于或等于0．5为阳性。与IDEXX公司PRRSV抗体检测试剂盒对临床样品的检测结果进行比较后，初步判定所建立的ELISA之所以出现较多的假阴性。可能是目前临床上出现了PRRSV欧洲型所致。