COMPARISON OF ABILITY TO DETECT SARS-COV-2 IN 20-POOLED AND 10-POOLED NASOPHARYNGEAL SWABS USING THE REAL-TIME RT PCR METHOD

Nguyễn Văn An1,, Lê Thu Hồng1, Nguyễn Hùng Cường1, Hoàng Xuân Quảng1, Nguyễn Thái Sơn1
1 Military Hospital 103

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Abstract

Objective: Comparison of ability to detect SARS-CoV-2 in 20-pooled and 10-pooled Nasopharyngeal swabs using the real-time RT PCR method. Methods: This was a descriptive and experimental study. The 10-pooled and 20-pooled samples were created from nasopharyngeal swabs confirmed as positive and negative with SARS-CoV-2. The pooled samples were tested using the real-time RT PCR. Positive agreement and negative agreement of the test on 10-pooled and 20-pooled samples were compared. Results: The percentage of positive agreement of the real-time RT PCR to detect SARS-CoV-2 in 20-pooled with 10-pooled samples was 100%. Conclusion: Our study showed that the ability to detect a SARS-CoV-2 positive sample of the real-time RT PCR method in 20-pooled samples that were produced by mixing the solution of 2 of 10-pooled swab samples was equivalent to the ability to detect a SARS-CoV-2 positive sample in the 10-pooled sample.

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References

1. World Health Organization (WHO) Weekly operational update on COVID-19 - 30 November 2021. Availble at: https://www.who.int/ publications/m/item/weekly-operational-update-on-covid-19-30-november-2021. Accessed 2 December 2021.
2. Agoti, C.N., et al. "Pooled testing conserves SARS-CoV-2 laboratory resources and improves test turn-around time: experience on the Kenyan Coast". Wellcome Open Res, (2020) 5: p. 186.
3. Hirotsu, Y., et al. "Pooling RT-qPCR testing for SARS-CoV-2 in 1000 individuals of healthy and infection-suspected patients". Sci Rep, (2020) 10(1): p. 18899.
4. Mahmoud, S.A., et al. "Evaluation of pooling of samples for testing SARS-CoV- 2 for mass screening of COVID-19". BMC Infect Dis, (2021) 21(1): p. 360.
5. Mulu, A., et al. "Evaluation of sample pooling for screening of SARS CoV-2". PLoS One, (2021) 16(2): p. e0247767.
6. CLSI "User Protocol for Evaluation of Qualitative Test Performance; Approved Guideline - Second Edition. CLSI document EP12-A2. Wayne, PA: Clinical and Laboratory Standards Institute". (2008).
7. Food and Drug Administration. United States of America "Pooled sample testing and screening testing for COVID-19". Available at: https://www.fda.gov/medical-devices/coronavirus-covid-19-and-medical-devices/pooled-sample-testing-and-screening-testing-covid-19. Accessed 13 Sept 2020.
8. Hiroi, S., et al. "Infectivity assay for detection of SARS-CoV-2 in samples from patients with COVID-19". J Med Virol, (2021) 93(10): p. 5917-5923.