Rapid and Reliable Detection of SARS-CoV-2 Using Direct RT-LAMP

Area of Science:

• Molecular Biology
• Virology
• Diagnostic Assay Development

Background:

• The SARS-CoV-2 pandemic presents significant global healthcare, social, and economic challenges.
• The World Health Organization (WHO) has emphasized the need for extensive screening to limit viral spread.
• A demand exists for rapid, simple, and sensitive diagnostic assays for SARS-CoV-2 detection.

Purpose of the Study:

• To develop and validate a reverse transcription-loop-mediated isothermal amplification (RT-LAMP) assay for SARS-CoV-2 detection.
• To optimize the RT-LAMP protocol for sensitivity and specificity.
• To compare the performance of the RT-LAMP assay against the standard real-time RT-PCR (rtRT-PCR) method.

Main Methods:

• SARS-CoV-2 detection was performed using RT-LAMP, optimizing amplification mixes and reaction times.
• The assay was validated on 200 nasopharyngeal swabs (62 positive, 138 negative by rtRT-PCR).
• RT-LAMP utilized singleplex and multiplex primer sets targeting N, S, and orf1ab genes at 65°C.

Main Results:

• The developed RT-LAMP protocol achieved 100% concordance with the standard rtRT-PCR method.
• The assay demonstrated high sensitivity and specificity for SARS-CoV-2 nucleic acid detection.
• Optimization involved evaluating fluorescence amplification mixes and reaction durations.

Conclusions:

• A rapid, simple, and sensitive RT-LAMP assay for SARS-CoV-2 detection in clinical samples was successfully established.
• The assay is suitable for point-of-care diagnostics in various settings, including public hospitals and rural medical centers.
• This method provides a valuable tool for timely SARS-CoV-2 screening in diverse healthcare environments.