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A prospective diagnostic evaluation of accuracy of self-taken and healthcare worker-taken swabs for rapid COVID-19 testing.
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- Author(s): Savage HR;Savage HR; Finch L; Finch L; Body R; Body R; Watkins RL; Watkins RL; Hayward G; Hayward G; Cook E; Cook E; Cubas-Atienzar AI; Cubas-Atienzar AI; Cuevas LE; Cuevas LE; MacPherson P; MacPherson P; MacPherson P; MacPherson P; Adams ER; Adams ER
- Source:
PloS one [PLoS One] 2022 Jun 30; Vol. 17 (6), pp. e0270715. Date of Electronic Publication: 2022 Jun 30 (Print Publication: 2022).- Publication Type:
Journal Article; Research Support, Non-U.S. Gov't- Language:
English - Source:
- Additional Information
- Corporate Authors:
- Source: Publisher: Public Library of Science Country of Publication: United States NLM ID: 101285081 Publication Model: eCollection Cited Medium: Internet ISSN: 1932-6203 (Electronic) Linking ISSN: 19326203 NLM ISO Abbreviation: PLoS One Subsets: MEDLINE
- Publication Information: Original Publication: San Francisco, CA : Public Library of Science
- Subject Terms:
- Abstract: Background: Rapid diagnostic tests (RDTs) developed for point of care detection of SARS-CoV-2 antigen are recommended by WHO to use trained health care workers to collect samples. We hypothesised that self-taken samples are non-inferior for use with RDTs to diagnose COVID-19. We designed a prospective diagnostic evaluation comparing self-taken and healthcare worker (HCW)-taken throat/nasal swabs to perform RDTs for SARS-CoV-2, and how these compare to RT-PCR.
Methods: Eligible participants 18 years or older with symptoms of COVID-19. 250 participants recruited at the NHS Test and Trace drive-through community PCR testing site (Liverpool, UK); one withdrew before analysis. Self-administered throat/nasal swab for the Covios® RDT, a trained HCW taken throat/nasal sample for PCR and HCW comparison throat/nasal swab for RDT were collected. RDT results were compared to RT-PCR, as the reference standard, to calculate sensitivity and specificity.
Findings: Seventy-five participants (75/249, 30.1%) were positive by RT-PCR. RDTs with self-taken swabs had a sensitivity of 90.5% (67/74, 95% CI: 83.9-97.2), compared to 78.4% (58/74, 95% CI: 69.0-87.8) for HCW-taken swabs (absolute difference 12.2%, 95% CI: 4.7-19.6, p = 0.003). Specificity for self-taken swabs was 99.4% (173/174, 95% CI: 98.3-100.0), versus 98.9% (172/174, 95% CI: 97.3-100.0) for HCW-taken swabs (absolute difference 0.6%, 95% CI: 0.5-1.7, p = 0.317). The PPV of self-taken RDTs (98.5%, 67/68, 95% CI: 95.7-100.0) and HCW-taken RDTs (96.7%, 58/60, 95% CI 92.1-100.0) were not significantly different (p = 0.262). However, the NPV of self-taken swab RDTs was significantly higher (96.1%, 173/180, 95% CI: 93.2-98.9) than HCW-taken RDTs (91.5%, 172/188, 95% CI 87.5-95.5, p = 0.003).
Interpretation: In conclusion, self-taken swabs for COVID-19 testing offer an accurate alternative to healthcare worker taken swabs for use with RDTs. Our results demonstrate that, with no training, self-taken throat/nasal samples can be used by lay individuals as part of rapid testing programmes for symptomatic adults. This is especially important where the lack of trained healthcare workers restricts access to testing.
Competing Interests: ERA contributed to this study design and analysis in her role as PhD supervisor to HRS at LSTM, she is also Director of Epidemics and NTDs at Mologic Ltd a UK diagnostics company who provided the RDTs for this study under joint Wellcome funding. This does not alter our adherence to PLOS ONE policies on sharing data and materials. - References: BMJ. 2021 Oct 15;375:n2535. (PMID: 34654726)
N Engl J Med. 2020 Jul 30;383(5):494-496. (PMID: 32492294)
EClinicalMedicine. 2021 Jun;36:100924. (PMID: 34101770)
Infect Dis (Lond). 2021 Nov-Dec;53(12):947-952. (PMID: 34445926)
BMJ. 2021 Jul 6;374:n1637. (PMID: 34230058)
BMJ. 2021 Feb 4;372:n287. (PMID: 33541908)
Acad Emerg Med. 1996 Sep;3(9):895-900. (PMID: 8870764)
Eur Respir J. 2021 May 6;57(5):. (PMID: 33574072)
JAMA Netw Open. 2020 Jun 1;3(6):e2012005. (PMID: 32530469)
J Clin Virol. 2021 Aug;141:104874. (PMID: 34144452)
Sci Rep. 2021 Jul 21;11(1):14903. (PMID: 34290378) - Grant Information: 220764/Z/20/Z United Kingdom WT_ Wellcome Trust; 200901/Z/16/Z United Kingdom WT_ Wellcome Trust; United Kingdom DH_ Department of Health; 206575/Z/17/Z United Kingdom WT_ Wellcome Trust; United Kingdom WT_ Wellcome Trust
- Publication Date: Date Created: 20220630 Date Completed: 20220704 Latest Revision: 20230216
- Publication Date: 20230216
- Accession Number: PMC9246218
- Accession Number: 10.1371/journal.pone.0270715
- Accession Number: 35771760
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