Comparison between five PCR techniques for the diagnosis of SARS-CoV-2

Area of Science:

• Clinical diagnostics
• Molecular biology
• Infectious disease research

Background:

• The emergence of SARS-CoV-2 necessitated rapid development of diagnostic tools.
• Accurate detection is crucial for effective epidemiological control of the pandemic.
• Various direct and serological diagnostic techniques have been introduced.

Purpose of the Study:

• To evaluate and compare the performance of five commercial real-time RT-PCR kits for SARS-CoV-2 detection.
• Key performance metrics assessed include sensitivity, specificity, and agreement between kits.
• The study aimed to guide the selection of optimal diagnostic assays.

Main Methods:

• Five distinct commercial real-time RT-PCR kits were analyzed.
• Known positive samples underwent serial dilutions to assess sensitivity across concentrations.
• 135 known negative samples were used to determine specificity and agreement.

Main Results:

• Palex, Roche, and GeneXpert kits exhibited identical performance: 98.21% sensitivity, 100% specificity, 100% PPV, and 99.26% NPV.
• Becton Dickinson showed 89.28% sensitivity, 100% specificity, 100% PPV, and 95.74% NPV.
• Kappa index for agreement was high for Palex (0.9892), Roche (0.9892), and GeneXpert (0.9892), and slightly lower for Becton Dickinson (0.9215).

Conclusions:

• All evaluated commercial RT-PCR kits demonstrated high diagnostic accuracy.
• Palex, Roche, and GeneXpert kits showed excellent sensitivity, specificity, and agreement.
• The findings support the utility of these RT-PCR kits for reliable SARS-CoV-2 detection.