Development and Application of One-step Real-time Fluorescent Quantitative RT-PCR Assay for Rapid Detection of H1 Subtype Swine Influenza Virus

To establish a rapid, simple and accurate method to diagnose and detect H1 subtype swine influenza virus (SIV), the specific primers and TaqMan MGB probe were designed according to the conserved region of HA gene of H1 subtype SIV. A one-step Real-time fluorescent quantitative RT-PCR assay was developed for detection of H1 subtype SIV. A series of dilutions of recombinant plasmids pMD18-H1 were prepared and used to generate standard curves. The results showed that the one-step Real-time fluorescent quantitative RT-PCR was capable of detecting 10² copies of H1 subtype SIV per microliter. The results were negative for the detection of H3N2 and H9N1 subtypes SIV, classical swine fever virus, porcine reproductive and respiratory syndrome virus, porcine epidemic diarrhea virus, transmissible gastroenteritis virus. The coincidence rates between one-step Real-time fluorescent quantitative RT-PCR and virus isolation were 94%. The method was highly specific and sensitive, and could be used for rapid quantitative detection of H1 subtype SIV.