Role of presymptomatic transmission of COVID-19: evidence from Beijing, China.
J Epidemiol Community Health
; 75(1): 84-87, 2021 01.
Article
in English
| MEDLINE | ID: covidwho-733144
ABSTRACT
BACKGROUND:
The presymptomatic transmission of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has been documented in limited clusters, and it is predicted through modelling. However, there is a lack of evidence from observations with a large sample size.METHODS:
We used data from meticulous contact tracing of people exposed to cases of SARS-CoV-2 to estimate the proportion of cases that result from the presymptomatic transmission of the virus in Beijing during January 2020 and February 2020.RESULTS:
The results showed that presymptomatic transmission occurred in at least 15% of 100 secondary COVID-19 cases. The earliest presymptomatic contact event occurred 5 days prior to the index case's onset of symptoms, and this occurred in two clusters.CONCLUSIONS:
The finding suggested that the contact tracing period should be earlier and highlighted the importance of preventing transmission opportunities well before the onset of symptoms.Keywords
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
Carrier State
/
Disease Outbreaks
/
Asymptomatic Infections
/
SARS-CoV-2
/
COVID-19
Type of study:
Diagnostic study
/
Observational study
/
Prognostic study
Limits:
Adult
/
Female
/
Humans
/
Male
/
Middle aged
Country/Region as subject:
Asia
Language:
English
Journal:
J Epidemiol Community Health
Year:
2021
Document Type:
Article
Affiliation country:
Jech-2020-214635
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