鸡传染性支气管炎病毒的快速检测

本试验建立了一种快速检测鸡传染性支气管炎病毒的通用性PCR方法。通过对纯化后IBV核蛋白基因进行的直接PCR及套式PCR扩增表明，两次PCR产物的大小为0.7kb和0.5kb，与实际设计相符。而对照的NDV主IBDV的PCR扩增产物均为阴性。用IBV HB（华北）株感染SPF鸡后，应用我们所建立的PCR方法去检测不同时期所采集的肾脏、气管、盲肠扁桃体、肺脏和肝脏中的IBV，在SPF鸡感染IBV后的21天仍然能够检测到IBV的基因组，Southern blot杂交试验证明了我们获得的PCR产物为IBV的核蛋白基因。对30份自然感染病料的检测表明，本实验所建立的PCR方法检测阳性数为15份，阳性率为50％（15／30）；鸡胚接种检测的阳性数为17份，阳性率为56．7％（17／30）；IFA检测的阳性数11 ，阳性率为36．7％（11／30）。PVR检测法与鸡胚接种方法的阳性符合率为93．3％（14／15），统计学分析表明，P＞0．05，差异不显著，而PCR检测法与IFA的阳性符合率为60％（9／15）。结果证明本实验所建立的PCR检测方法具有敏感、特异、快速等特点，适用于不同来源及不同血清型IBV的检测。

PCR Method for the Rapid Detection of IBV

A PCR method was developed for the rapid detection of IBV.Direct and nested PCR for amplifying purified N gene showed that two products were 0.7kb and 0.5kb,which were identical to initial designed, while the PCR products of controlled NDV and IBDV were negative. SPF chickens were infected with IBV HB strain and their kidney,trachea,lung and liver were collected at different time and detected by using our PCR method.The result showed that IBV was still detected at 21 st day post infection. Southern blotting hybridization proved that our PCR product was IBV N gene.30 samples tested by PCR, chickens embryo culture and IFA.The positive nubmers wers 15,17 and 11,respectively. The PCR and chickens embryo culture test shared the same results which was up to 93.3%(14/15)and there were no differentiation(P>0.05)between the two methods.Our PCR (method) is more sensitive,specific,rapid than IFA and is competent of the detection for different IBV strains.