One-step SYBR green-based real-time RT-PCR assay for detection of foot-and-mouth disease virus circulating in India.

Jitendra K Biswal, Biswa Ranjan Jena, Syed Zeeshan Ali, Rajeev Ranjan, Jajati K Mohapatra, Rabindra Prasad Singh

Virus genes 2022 Apr

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Rapid, sensitive, and reliable laboratory detection of foot-and-mouth disease virus (FMDV) infection is essential for containing and controlling virus infection in any geographical area. In this report a SYBR green-based 3Dpol-specific one-step real-time RT-PCR (rRT-PCR) assay was developed for the pan-serotype detection of FMDV in India. The detection limit of the SYBR green-based rRT-PCR was 10-2 TCID50/50 µl, which is 10 times more sensitive than the traditional agarose gel electrophoresis-based RT-multiplex PCR (RT-mPCR). The standard curve exhibited a linear range across 8-log10 units of viral RNA dilution. The reproducibility and specificity of this assay were reasonably high suggesting that the 3Dpol-specific SYBR green rRT-PCR could detect FMDV genome specifically and with little run-to-run variation. The new 3Dpol-specific SYBR green rRT-PCR assay was evaluated alongside the established RT-mPCR using the archived FMDV isolates and clinical field samples from suspected FMD outbreaks. A perfect concordance was observed between the new rRT-PCR and the traditional RT-mPCR on viral RNA in the archived FMDV cell culture isolates tested. Furthermore, 73% of FMDV-suspected clinical samples were detected positive through the 3Dpol-specific SYBR green rRT-PCR, while the detection rate through the traditional RT-mPCR was 57%. Therefore, the SYBR green-based 3Dpol-specific one-step rRT-PCR could be considered as a valuable assay with higher diagnostic sensitivity to complement the routine assays that are being used for FMD virus diagnosis in India. © 2022. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

Citation

Jitendra K Biswal, Biswa Ranjan Jena, Syed Zeeshan Ali, Rajeev Ranjan, Jajati K Mohapatra, Rabindra Prasad Singh. One-step SYBR green-based real-time RT-PCR assay for detection of foot-and-mouth disease virus circulating in India. Virus genes. 2022 Apr;58(2):113-121