Abstract
The objective of this study was to develop a novel EvaGreen (EG) based real-time PCR technique for the simultaneous detection of Equine herpesvirus 1 (EHV-1) and Equine herpesvirus 4 (EHV-4) genomes from equine nasal swabs. Viral genomes were identified based on their specific melting temperatures (T m), which are 88.0 and 84.4 °C for EHV-1 and EHV-4, respectively. The detection limitation of this method was 50 copies/μl or 0.15 pg/μl for EHV-1 and 5 copies/μl or 2.5 fg/μl for EHV-4. This assay was 50–1,000 times more sensitive than the SYBR Green (SG)-based assay using the same primer pairs and as sensitive as the TaqMan-MGB probe-based assay. The validity of the real-time PCR assays was confirmed by testing 13 clinical samples. When all results of the EG, SG, and TaqMan probe-based singleplex and duplex real-time PCRs were considered together, a total of 84.6 % (11/13) horses and donkeys were positive for at least one virus. EHV-1 and EHV-4 coexisted in 81.8 % (9/11) horses. Overall, we report that the EvaGreen duplex real-time PCR is an economical and alternative diagnostic method for the rapid differentiation of EHV-1 and EHV-4 in nasal swabs.
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Acknowledgments
We thank Zhige Tian for her experimental assistance. This study was supported by grants from the Central Public-interest Scientific Institution Basal Research Fund (0302012011), National Key Technology Research and Development Program of the Ministry of Science and Technology of China (2012BAD46B01-02 & 2012BAD46B03), and Special Fund for Agro-scientific Research in the Public Interest (201003075).
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Hu, Z., Zhu, C., Chang, H. et al. Development of a single-tube duplex EvaGreen real-time PCR for the detection and identification of EHV-1 and EHV-4. Appl Microbiol Biotechnol 98, 4179–4186 (2014). https://doi.org/10.1007/s00253-014-5626-6
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DOI: https://doi.org/10.1007/s00253-014-5626-6