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Document Type
Rapid Review
Review Code
LAB040701v2 RR
Question Submitted
April 7, 2020
Date Completed
May 8, 2020
Status
5. Updated review
Research Team
Laboratory
Document Type
Rapid Review
Review Code
LAB040701v2 RR
Question Submitted
April 7, 2020
Date Completed
May 8, 2020
Status
5. Updated review
Research Team
Laboratory
Key Findings
COVID-19 is primarily transmitted by symptomatic patientsand presymptomatic individuals.·Moderate grade evidence estimates that approximately 20% of COVID-19 transmission may bedue to that from presymptomatic individuals.However, estimates range from 6.4% -47%.·Asymptomatic individuals and environmental contaminationappear to contributelessto disease transmission,with estimated proportionsof 6% and 10%, respectivelyfrom modelling studies
Category
Clinical Presentation
Epidemiology
Subject
Transmission
Symptoms
Symptomatic
Asymptomatic
Natural History
Population
All
Priority Level
Level 2 completed within 8 hours
Cite As
Wang, H; Reeder, B; Howell-Spooner, B; What proportion of disease transmission is due to asymptomatic, pre-symptomatic and symptomatic cases? 2020 May 8; Document no.: LAB040701v2 RR. In: COVID-19 Rapid Evidence Reviews [Internet]. SK: SK COVID Evidence Support Team, c2020. 12 p. (CEST rapid review report)
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Review History
LAB040701 RR: April 7, 2020
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Document Type
Evidence Search Report
Review Code
LAB040701v2-01 ESR
Question Submitted
April 7, 2020
Date Completed
May 8, 2020
Status
5. Updated review
Research Team
Laboratory
Document Type
Evidence Search Report
Review Code
LAB040701v2-01 ESR
Question Submitted
April 7, 2020
Date Completed
May 8, 2020
Status
5. Updated review
Research Team
Laboratory
Category
Clinical Presentation
Epidemiology
Subject
Transmission
Symptoms
Symptomatic
Asymptomatic
Natural History
Population
All
Priority Level
Level 2 completed within 8 hours
Cite As
Howell-Spooner, B. What proportion of disease transmission is due to asymptomatic, pre-symptomatic and symptomatic cases? 2020 May 8; Document no.: LAB040701v2-01 ESR. In: COVID-19 Rapid Evidence Reviews [Internet]. SK: SK COVID Evidence Support Team, c2020. 25 p. (CEST evidence search report)
Review History
LAB040701 RR: April 7, 2020
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LAB040701v2-01 ESR

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