斑点免疫金渗滤法检测猪瘟抗体的研究

以猪瘟抗原包被硝酸纤维素膜，然后用胶体金标记SPA，建立检测猪瘟抗体水平的斑点免疫金渗滤法检测试纸盒。通过胶体金标记金黄色葡萄球菌A蛋白(SPA)直接显色，阳性者出现红色斑点，结果易于判断。整个试验过程仅需5min，操作简单，与猪兰耳病、猪伪狂犬病、猪细小病毒、新城疫和禽流感等阳性血清不发生交叉反应。同时将该法与目前猪瘟的常规检测方法Dot—ELISA法和间接血凝试验同时对200份猪血清进行猪瘟抗体检测比较，符合率达98．4％和98．9％。说明该法微量、特异、敏感可靠，检测时间短，效果直观，非常适用于猪瘟的早期诊断和普查以及疫苗免疫效果后抗体水平的检测。

Studies on Dot Immunogold Filtration Assay for Detection of Antibody to Classical Swine Fever Virus

To establish a more rapid and simple method of detecting antibody of SFV, a dot immunogold filtration assay (DIGFA) was developed by coating the antigen of CSFV on nitrocellulose (NC) membrane, and labeling staphylococcal protein A (SPA) with colloidal gold.The color of the positive dots were so bright that the results could be easily determined.The whole procedure could be finished in 5 min.The method had a better specificity without cross - reaction with positive sera to PKRSV, PRV, PPV, NDV and AFV.Its coincidence with Dot - EUSA,indirect haemagglutination test(IH) were 98.4% and 98.9% respectively.DIGFA,more simple and rapid,was applicable to small diagnostic laboratories.lt could be applied for more early diagnosis ^ epidemiological investigation and the detection of antibody level in vaccinated herds.