中文摘要：

从牛布鲁菌基因组中克隆出VirB12基因,以pET-28α（＋）为模板构建VirB12原核表达载体pET-V12,pET-V12在E.coli BL21（DE3）中表达重组VirB12蛋白。经Western-blotting分析,表明重组的VirB12蛋白具有免疫原性。以纯化的VirB12蛋白为抗原,建立了间接ELISA检测牛布鲁菌抗体的方法。经对300份牛血清样品间接ELISA与虎红平板试验（RBPT）检测结果的比较,该方法的敏感性为89%,特异性为98.3%,准确度为92.7%。

英文摘要：

Cloning VirB12 gene of bovine brucella, constructing VirBl 2 prokaryotic expression vec- tor using pET-28a（＋） as the template,and expressing VirB12 protein in E. coli BL21 （DE3）. The expressed product was analyzed by Western-blotting. The result shows that this protein has immunogenicity to bovine brucella. The purified VirB12 protein was coated as the antigen to con- struct a method of indirect ELISA for detecting bovine brucellosis from sera. Three hundred ser- um samples of bovine were detected by the indirect ELISA method. Its sensitivity was 89 %, speci- ficity was 98.3% and accuracy was 92.7% compared with the rose bengal plate test.