Research Center for Global Agromedicine, Obihiro University of Agriculture and Veterinary Medicine, Japan.
Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Japan.
J Vet Diagn Invest. 2020 Nov;32(6):887-891. doi: 10.1177/1040638720960046. Epub 2020 Oct 7.
Highly pathogenic influenza A viruses (IAVs) cause substantial damage to the poultry industry. A simple and quick testing method is required for strict control of this infectious agent. The fluorescence polarization immunoassay (FPIA) is a rapid test based on antigen-antibody binding, which can detect antigen-specific antibody in the infected animal samples within a few minutes. FPIA is a one-step reaction assay that does not require a secondary antibody and complicated steps. We evaluated the usefulness of FPIA for the detection of anti-IAV antibodies, including those against internal proteins and H5 subtype HA, in sera. In the FPIA using fluorescent peptides of internal NP and M1 proteins, millipolarization units (MPUs), which increase depending on the amount of antibody, were higher in antibody-positive sera than in antibody-negative sera. Moreover, in FPIA using fluorescent recombinant H5 subtype HA proteins, anti-H5 serum gave the highest MPUs among the antisera raised in goats against individual H1-H15 subtype IAVs. Our results support the utility of FPIA for the detection of anti-IAV antibodies, especially the anti-H5 antibody.
高致病性流感病毒(IAV)对家禽业造成了巨大的破坏。需要一种简单、快速的检测方法来严格控制这种传染性病原体。荧光偏振免疫分析(FPIA)是一种基于抗原-抗体结合的快速检测方法,可在几分钟内检测感染动物样本中针对特定抗原的抗体。FPIA 是一种一步反应检测法,不需要二次抗体和复杂的步骤。我们评估了 FPIA 在检测血清中抗 IAV 抗体(包括针对内部蛋白和 H5 亚型 HA 的抗体)方面的有用性。在使用内部 NP 和 M1 蛋白的荧光肽的 FPIA 中,抗体阳性血清中的毫偏振单位(MPU)比抗体阴性血清中的更高,这取决于抗体的数量。此外,在使用荧光重组 H5 亚型 HA 蛋白的 FPIA 中,针对单个 H1-H15 亚型 IAV 产生的抗 H5 血清在产生的抗血清中给出了最高的 MPU。我们的结果支持 FPIA 在检测抗 IAV 抗体,特别是抗 H5 抗体方面的应用。