3种国产布病抗体检测试剂盒的效果评价

为了比较国产布鲁菌病间接ELISA抗体检测试剂盒、竞争ELISA抗体检测试剂盒和胶体金试纸条的检测效果,通过对已知阴阳性血清样品的检测,比较了上述3种检测方法的敏感性和特异性。进一步采用临床血清样品比较了3种检测方法与虎红平板凝集试验(RBT)的检测效果,并采用补体结合试验(CFT)对结果进行了复核。结果显示,间接ELISA、竞争ELISA和胶体金试纸条的敏感性分别为96.67%,100.00%和98.33%,3种检测方法的特异性分别为98.33%,93.33%和93.33%。对300份临床样品的检测结果显示,4种检测方法共同检出的阳性样本为27份,阴性样品为210份,整体符合率为79%。通过CFT对63份不同方法检验结果有差异的样本进行确诊,结果表明RBT与CFT的符合率最低,仅为3.17%;间接ELISA与CFT的符合率最高,为98.41%;竞争ELISA和胶体金试纸条的符合率分别为87.30%,85.71%。结果表明,间接ELISA、竞争ELISA和胶体金试纸条具有良好的特异性和敏感性,能够满足布病临床检测需求;RBT对临床样本的检测存在较高比例假阳性和假阴性。     

一致性检验比较牛口蹄疫病毒抗体LBE检测试剂盒

用660份牛血清比较牛口蹄疫病毒O型、A型抗体液相阻断ELISA检测试剂盒检测结果的一致性,并用u检验排除抽样误差的影响。结果表明:待检血清最终稀释度数为1∶64时O型试剂盒联合检出523份口蹄疫抗体阳性和102份阴性,符合率为94.70%,结果一致性为极强(Kappa值=0.82);待检血清最终稀释度数为1∶128时O型试剂盒联合检出476份口蹄疫抗体阳性和125份阴性,符合率91.06%,结果为高度一致(Kappa值=0.75);血清最终稀释度数为164时A型试剂盒联合检出498份口蹄疫抗体阳性和120份阴性,符合率为93.64%,结果一致性为极强(Kappa值=0.81),血清最终稀释度数为1∶28时A型试剂盒联合检出354份口蹄疫抗体阳性和233份阴性,符合率为88.94%,结果为高度一致(Kappa值=0.77)。在不同包被方式下,LBE试剂盒检测待检血清牛口蹄疫病毒抗体结果一致性较好。兽医实验室可应用一致性检验,结合本单位人力、财力和物力等条件,选择适宜的牛口蹄疫病毒抗体检测试剂盒。     

Serological evidence of Anaplasma spp., Borrelia burgdorferi and Ehrlichia canis in dogs from the Republic of Korea by rapid diagnostic test kits

BackgroundEmergent and re-emergent canine tick-borne infections are attracting increasing attention worldwide. The rise in pet ownership and the close relationship between dogs and their owners are the most concerning factors because dogs may act as competent reservoirs for human tick-transmitted infectious agents.ObjectivesThis study contributes to the epidemiological surveillance of canine tick-transmitted infections with zoonotic risk in the Republic of Korea (ROK) by investigating the seroprevalence of the pathogens, Anaplasma spp., Borrelia burgdorferi, and Ehrlichia canis.MethodsFour hundred and thirty whole blood samples from domestic dogs were collected in seven metropolitan cities and nine provinces in the ROK and tested using SensPERT Ab test kits (VetAll Laboratories®) to detect seroreactive animals.ResultsThe seroprevalence rates identified were 9.8% (42/430) for Anaplasma spp., 2.8% (12/430) for B. burgdorferi, and 1.4% (6/430) for E. canis. The risk factors evaluated in this study that could be associated with the development of a humoral immune response, such as sex, age, and history of tick exposure, were similar. There was only one exception for dogs seroreactive to Anaplasma spp., where the risk factor “tick exposure” was statistically significant (p = 0.047).ConclusionsThis serological survey exhibited the widespread presence of Anaplasma spp., B. burgdorferi, and E. canis throughout the ROK. Hence, dogs may play a key role as the sentinel animals of multiple zoonotic infectious agents in the country.     

Comparison of four test kits for feline leukemia virus antigen.

The sensitivity and specificity of 4 commercial FeLV ELISA kits, using blood, were compared with results of virus isolation from blood and immunofluorescent antibody (IFA) testing on blood. Significant differences were not found among the 4 ELISA kits. Marked decrease in sensitivity of the ELISA kits was detected when virus isolation was used as the standard of positivity rather than the IFA test. Virus isolation was a more sensitive indicator of early infection, with marked discrepancy among results obtained by virus isolation, ELISA, and the IFA test. Results became progressively more concordant as infection became fully established. Cats FeLV-positive by virus isolation alone were more likely to eliminate viremia. All cats FeLV-positive by IFA testing remained persistently viremic. Virus isolation, ELISA, and IFA testing appear to differ in their prognostic value. The use of blood rather than serum for the ELISA resulted in several discordant results. Six cats were FeLV-positive by ELISA when blood was tested but were FeLV-negative when serum was tested. Positive ELISA results were obtained for 4 of these cats when serum was tested, using extended incubation to increase sensitivity. It is possible that blood may actually be more sensitive than serum for use of the ELISA method.     

反刍动物口蹄疫ELISA诊断试剂盒质量检测

利用参考血清,按试剂盒标明的使用方法,对上海优耐特生物医药有限公司提供的3批反刍动物口蹄疫病毒VP1结构蛋白抗体和3批反刍动物口蹄疫病毒NS非结构蛋白抗体ELISA诊断试剂盒的敏感性和特异性分别进行检测.结果表明,2种试剂盒的敏感性和特异性均符合相关标准的规定.     

3种猪伪狂犬病gB抗体ELISA检测试剂盒的比较

采用3种猪伪狂犬病gB抗体ELISA检测试剂盒检测121份血清样品,对检测结果进行Kappa一致性检验。结果显示:3种gB抗体检测试剂盒都具有很好的重复性,两两之间检测结果的符合率达80%以上,Kappa值0.6,表明3种检测试剂盒具有较好的重复性和一致性。     

Sensitivity and specificity of blood test kits for feline leukemia virus antigen

Enzyme-linked immunosorbent assay (ELISA) test kits have been used widely to diagnose FeLV infection. Several companies have licensed such kits, but because these test kits are designed somewhat differently, a demonstration of their relative merits was needed. Differences in the sensitivity and specificity of 7 commercial test kits were determined by testing sera that induce false-negative (limiting dilution of FeLV group specific antigen, p27), and false-positive (cat anti-mouse antibody) test results. Among the panels of sera used in this study, significant differences in test kit sensitivity were not observed, but differences in specificity were identified. An interim report of these studies, supplied to the manufacturers, prompted changes in some of the kits, resulting in improved specificities. Generally, FeLV test kits are now more efficient in accurately detecting p27 in blood, serum, or plasma of cats. Nevertheless, some kits still lack specificity attributable to reagents supplied by the manufacturer.     

Evaluation of two commercial test kits for detection of occult blood in feces of dogs

To evaluate the sensitivity and specificity of 2 commercial test kits for detection of occult blood in canine feces, various volumes of blood were administered to 6 dogs via orogastric tube. Blood volumes tested were chosen on the basis of hemoglobin quantities of 5, 10, 20, 200, 350, and 500 mg of hemoglobin/kg of body weight. Fecal specimens were collected twice daily and analyzed separately by 2 observers for the presence of occult blood by use of modified guaiac and orthotolodine tablet tests, and for melena by visual inspection. Five dogs given blood at the rate of 500 mg of hemoglobin/kg and 1 dog given blood at the rate of 350 mg of hemoglobin/kg developed melena. Results of both occult blood tests were positive in 2 of 6 dogs given blood at the rate of 5 mg of hemoglobin/kg. Five of 6, and 4 of 6 dogs given blood at the rate of 10 mg hemoglobin/kg had positive test results by modified guaiac and orthotolodine methods, respectively. Results of both methods were positive in all dogs given blood at the rate of 20 mg of hemoglobin/kg. There was 86% agreement between the 2 observers' results for the modified guaiac method, and 78% agreement for the orthotolodine method. There was 77% agreement of results between the 2 test methods. Gastrointestinal transit time decreased with increasing volumes of blood. Occult blood testing was found to be useful for detection of blood in feces at volumes 20 to 50 times less than that required to cause melena.