SARS-CoV-2 RNA stability in dry swabs for longer storage and transport at different temperatures

Research output: Contribution to journalJournal articleResearchpeer-review

  • Alonzo Alfaro-Núñez
  • Stephanie Crone
  • Shila Mortensen
  • Maiken Worsøe Rosenstierne
  • Anders Fomsgaard
  • Ellinor Marving
  • Sofie Holdflod Nielsen
  • Michelle Grace Pinto Jørgensen
  • Charlotta Polacek
  • Arieh S. Cohen
  • Claus Nielsen

During the current COVID-19 pandemic, different methods have been used to evaluate patients with suspected SARS-CoV-2 infection. In this study, we experimentally evaluate the ability of spiked saliva-moist swabs and spiked swabs without any transport medium to retain SARS-CoV-2 for storage and transport at different environmental settings during different incubation time periods. Our results show that at ambient temperature of 20°C, SARS-CoV-2 RNA remains stable for up to 9 days allowing a long-time span for transport and storage without compromising clinical results. Additionally, this study demonstrates that saliva-moist swabs can also be stored at −20°C and +4°C for up to 26 days without affecting RT-qPCR results. Our data are relevant for low-and middle-income countries, which have limited access to rapid refrigerated transport and storage of samples representing an economical alternative. Finally, our study demonstrates the practical and economic advantage of using swabs without transport medium.

Original languageEnglish
JournalTransboundary and Emerging Diseases
Volume69
Issue number2
Pages (from-to)189-194
ISSN1865-1674
DOIs
Publication statusPublished - 2022

Bibliographical note

Publisher Copyright:
© 2021 Wiley-VCH GmbH.

    Research areas

  • clinical samples, COVID-19, diagnostics, oropharyngeal, RNA quantification methods, saliva, surveillance, transport medium, virus stability

ID: 345317305