H9 s ubtype avian influenza virus（AIV） and infectious bronchitis virus（IBV） are major pathogens circulating in poultry and have resulted in great economic losses due to respiratory disease and reduced egg producti...H9 s ubtype avian influenza virus（AIV） and infectious bronchitis virus（IBV） are major pathogens circulating in poultry and have resulted in great economic losses due to respiratory disease and reduced egg production. As similar symptoms are elicited by the two pathogens, it is difficult for their differential diagnosis. So far, no reverse transcription-polymerase chain reaction（RT-PCR） assay has been found to differentiate between H9 AIV and IBV in one reaction. Therefore, developing a sensitive and specific method is of importance to simultaneously detect and differentiate H9 AIV and IBV. In this study, a duplex RT-PCR（d RT-PCR） was established. Two primer sets target the hemagglutinin（HA） gene of H9 AIV and the nucleocapsid（N） gene of IBV, respectively. Spec ific PCR products were obtained from all tested H9 AIVs and IBVs belonging to the major clades circulating in China, but not from AIVs of other subtypes or other infectious avian viruses. The sensitivity of the d RT-PCR assay corresponding to H9 AIV, IBV and mixture of H9 AIV and IBV were at a concentration of 1×10^1, 1.5×10^1 and 1.5×10^1 50% egg infective doses（EID_（50）） m L^–1, respectively. The concordance rates between the d RT-PCR and virus isolation were 99.1 and 98.2%, respectively, for detection of samples from H9N2 AIV or IBV infected chickens, while the concordance rate was 99.1% for detection of samples from H9N2 AIV and IBV co-infected chickens. Thus, the d RT-PCR assay reported herein is specific and sensitive, and suitable for the differential diagnosis of clinical infections and survei llance of H9 AIVs and IBVs.展开更多
【目的】建立一种猪A群轮状病毒(porcine rotavirus group A, PoRV A)快速检测方法,用于PoRV检测和流行病学调查。【方法】参考GenBank中猪A群轮状病毒(PoRVA)VP6基因序列(登录号MT025937.1、OP978242.1、PP566178.1)设计特异性引物和探...【目的】建立一种猪A群轮状病毒(porcine rotavirus group A, PoRV A)快速检测方法,用于PoRV检测和流行病学调查。【方法】参考GenBank中猪A群轮状病毒(PoRVA)VP6基因序列(登录号MT025937.1、OP978242.1、PP566178.1)设计特异性引物和探针,优化反应体系中引物和探针的浓度,建立Taq Man RT-qPCR检测方法,并通过特异性、灵敏性和重复性的结果以及临床应用对该方法进行评价。【结果】该方法可特异性扩增PoRV核酸,最低检出限度为27.0 copies·μL^(-1),灵敏度高于普通RT-PCR 100倍;与猪流行性腹泻病毒(porcine epidemicdiarrheavirus,PEDV)、猪德尔塔冠状病毒(porcinedeltacoronavirus,PDCoV)、猪传染性胃肠炎病毒(transmissible gastroenteritis of swine, TGEV)核酸均无交叉反应;组内和组间变异系数均小于1.10%,重复性好。151份疑似PoRV的临床样品使用RT-qPCR进行检测,结果显示检出率为42.38%(64/151),优于常规RT-PCR的检出率(33.11%,50/151)。【结论】本研究基于猪A群轮状病毒VP6基因,建立了适用于PoRV A检测及其流行病学调查的Taq Man实时荧光定量PCR检测方法,具有灵敏度高、特异性强、重复性好等优势,为猪轮状病毒检测和流行病学调查提供了技术手段。展开更多
基金supported by the National High-Tech R&D Program of China(2012AA101303)
文摘H9 s ubtype avian influenza virus（AIV） and infectious bronchitis virus（IBV） are major pathogens circulating in poultry and have resulted in great economic losses due to respiratory disease and reduced egg production. As similar symptoms are elicited by the two pathogens, it is difficult for their differential diagnosis. So far, no reverse transcription-polymerase chain reaction（RT-PCR） assay has been found to differentiate between H9 AIV and IBV in one reaction. Therefore, developing a sensitive and specific method is of importance to simultaneously detect and differentiate H9 AIV and IBV. In this study, a duplex RT-PCR（d RT-PCR） was established. Two primer sets target the hemagglutinin（HA） gene of H9 AIV and the nucleocapsid（N） gene of IBV, respectively. Spec ific PCR products were obtained from all tested H9 AIVs and IBVs belonging to the major clades circulating in China, but not from AIVs of other subtypes or other infectious avian viruses. The sensitivity of the d RT-PCR assay corresponding to H9 AIV, IBV and mixture of H9 AIV and IBV were at a concentration of 1×10^1, 1.5×10^1 and 1.5×10^1 50% egg infective doses（EID_（50）） m L^–1, respectively. The concordance rates between the d RT-PCR and virus isolation were 99.1 and 98.2%, respectively, for detection of samples from H9N2 AIV or IBV infected chickens, while the concordance rate was 99.1% for detection of samples from H9N2 AIV and IBV co-infected chickens. Thus, the d RT-PCR assay reported herein is specific and sensitive, and suitable for the differential diagnosis of clinical infections and survei llance of H9 AIVs and IBVs.
文摘【目的】建立一种猪A群轮状病毒(porcine rotavirus group A, PoRV A)快速检测方法,用于PoRV检测和流行病学调查。【方法】参考GenBank中猪A群轮状病毒(PoRVA)VP6基因序列(登录号MT025937.1、OP978242.1、PP566178.1)设计特异性引物和探针,优化反应体系中引物和探针的浓度,建立Taq Man RT-qPCR检测方法,并通过特异性、灵敏性和重复性的结果以及临床应用对该方法进行评价。【结果】该方法可特异性扩增PoRV核酸,最低检出限度为27.0 copies·μL^(-1),灵敏度高于普通RT-PCR 100倍;与猪流行性腹泻病毒(porcine epidemicdiarrheavirus,PEDV)、猪德尔塔冠状病毒(porcinedeltacoronavirus,PDCoV)、猪传染性胃肠炎病毒(transmissible gastroenteritis of swine, TGEV)核酸均无交叉反应;组内和组间变异系数均小于1.10%,重复性好。151份疑似PoRV的临床样品使用RT-qPCR进行检测,结果显示检出率为42.38%(64/151),优于常规RT-PCR的检出率(33.11%,50/151)。【结论】本研究基于猪A群轮状病毒VP6基因,建立了适用于PoRV A检测及其流行病学调查的Taq Man实时荧光定量PCR检测方法,具有灵敏度高、特异性强、重复性好等优势,为猪轮状病毒检测和流行病学调查提供了技术手段。
