Transmissibility of asymptomatic COVID-19: Data from Japanese clusters.
Int J Infect Dis
; 105: 236-238, 2021 Apr.
Article
in English
| MEDLINE | ID: covidwho-1093059
ABSTRACT
BACKGROUND:
The epidemiological importance of asymptomatic individuals who would never develop illness, compared to those who eventually develop symptoms, has yet to be fully clarified.METHODS:
The very first cluster data in Tokyo and Kanagawa (n = 36) were analyzed. Movement of all close contact was restricted for 14 days and they underwent laboratory testing with polymerase chain reaction. The reproduction numbers of symptomatic and asymptomatic cases were estimated.RESULTS:
The reproduction number for symptomatic cases was estimated to be 1.2 (95% confidence interval (CI) 0.5-2.9). The relative infectiousness of asymptomatically infected cases was estimated to be 0.27 (95% CI 0.03-0.81) of symptomatic cases.CONCLUSION:
The relative transmissibility of asymptomatic cases is limited. Observing clusters starting with symptomatic transmission might be sufficient for the control.Keywords
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
Asymptomatic Infections
/
SARS-CoV-2
/
COVID-19
Type of study:
Observational study
Limits:
Female
/
Humans
/
Male
/
Middle aged
Country/Region as subject:
Asia
Language:
English
Journal:
Int J Infect Dis
Journal subject:
Communicable Diseases
Year:
2021
Document Type:
Article
Affiliation country:
J.ijid.2021.02.065
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