Cited by 157SARS-CoV-2 and COVID-19 ResearchCOVID-19 Clinical Research StudiesCOVID-19 epidemiological studies

The duration of infectiousness of individuals infected with SARS-CoV-2

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Walsh, Kieran A., Spillane, Susan, Comber, Laura, Cardwell, Karen, Harrington, Patricia, Connell, Jeff, Teljeur, Conor, Broderick, Natasha +4 more·2020·Journal of Infection

Abstract

Objectives To summarise the evidence on the duration of infectiousness of individuals in whom SARS-CoV-2 ribonucleic acid is detected.Methods A rapid review was undertaken in PubMed, Europe PubMed Central and EMBASE from 1 January 2020 to 26 August 2020.Results We identified 15 relevant studies, including 13 virus culture and 2 contact tracing studies. For 5 virus culture studies, the last day on which SARS-CoV-2 was isolated occurred within 10 days of symptom onset. For another 5 studies, SARS-CoV-2 was isolated beyond day 10 for approximately 3% of included patients. The remaining 3 virus culture studies included patients with severe or critical disease; SARS-CoV-2 was isolated up to day 32 in one study. Two studies identified immunocompromised patients from whom SARS-CoV-2 was isolated for up to 20 days. Both contact tracing studies, when close contacts were first exposed greater than 5 days after symptom onset in the index case, found no evidence of laboratory-confirmed onward transmission of SARS-CoV-2.Conclusion COVID-19 patients with mild-to-moderate illness are highly unlikely to be infectious beyond 10 days of symptoms. However, evidence from a limited number of studies indicates that patients with severe-to-critical illness or who are immunocompromised, may shed infectious virus for longer.

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  1. [19]Veritas Health Innovation. Covidence systematic review software Melbourne, Australia. 2020 [Available from: www.covidence.org.

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Authors
Walsh, K. A., Spillane, S., Comber, L., Cardwell, K., Harrington, P., Connell, J., Teljeur, C., Broderick, N., de Gascun, C. F., Smith, S. M., Ryan, M., & O'Neill, M.
Affiliations
  • Health Information and Quality Authority (IE)
  • Royal College of Surgeons in Ireland (IE)
  • University College Dublin (IE)
  • Trinity College Dublin (IE)
Corresponding author
Walsh, Kieran A.
Venue
Journal of Infection
Publisher
Elsevier BV
Published
2020-12
Volume
81
Issue
6
Pages
847-856
ISSN
0163-4453 (ISSN-L)
OpenAlex
W3092430350
Cited by
157
References
41
Citations by year
2026: 8 · 2025: 12 · 2024: 14 · 2023: 23 · 2022: 40 · 2021: 54 · 2020: 6
FWCI
1.45
Type
journal article
Language
en
Open access
Locations
  • Journal of Infection (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Figshare (submittedVersion, cc-by-nc-sa)
  • Lenus, The Irish Health Repository (Dr Steevens Hospital Library) (submittedVersion, cc-by-nc-nd)
Funders
Health Research Board
Topics
  • Health Sciences › Medicine › Infectious Diseases › SARS-CoV-2 and COVID-19 Research
  • Health Sciences › Medicine › Infectious Diseases › COVID-19 Clinical Research Studies
  • Physical Sciences › Mathematics › Modeling and Simulation › COVID-19 epidemiological studies
Keywords
SARS-CoV-2, COVID-19 pandemic, infectious period, viral shedding, contact tracing, viral culture, immunocompromised patients, severe COVID-19, symptom onset, transmission
MeSH terms
COVID-19, SARS-CoV-2, Humans, Patient Isolation, RNA, Viral, Severity of Illness Index, Time Factors, Contact Tracing, Disease Transmission, Infectious, Viral Load, Reverse Transcriptase Polymerase Chain Reaction

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