[目的]牛病毒性腹泻病毒（BVDV）是一种可以引起牛腹泻的病原体,在中国分布广泛,给养牛业造成了巨大损失。快速发现和准确鉴定BVDV对后续管理和流行病学调查至关重要。[方法]本研究以5'UTR基因为靶点,应用交叉引物扩增（CPA）与免疫层析试纸相结合的检测方法对BVDV进行检测。[结果]CPA检测限为每次反应640 fg,温度为62 ℃,反应时间为60 min。未观察到与牛感染的其他病原体发生交叉反应。此外,使用CPA测定法对100 份感染BVDV的现场样本进行准确评估。将CPA与常规PCR检测结果进行比较,结果显示,CPA比常规PCR具有更高的检出率。[结论]CPA检测是一种实用、有效的BVDV诊断工具。
[Objective] Bovine viral diarrhea virus（BVDV）is a known causative agent of cattle diarrhea and is widely distributed across China. It caused huge losses to the cattle industry. Rapid detection and accurate identification of BVDV is essential for follow-up management and epidemiological investigations.[Method] In this study,targeting the 5'UTR gene,a cross-priming amplification combined with vertical flow （CPA-VF）assay was developed.[Result] The detection limit of the CPA assay was 640 fg per reaction at 62 ℃ for 60 min. No cross-reactions were observed with other pathogene infective to cattle. Furthermore,100 fecal sample from experimentally-infected animals were accurately assessed using the CPA assay. The performance of the CPA assay was compared with the results of conventional PCR.CPA had a higher detection rate than conventional PCR.[Conclusion] The CPA-VF assay is a practical and effective diagnostic tool for cattle diarrhea caused by BVDV.
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