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In a study that synthesized research on asymptomatic cases and transmission rates screened 2,454 articles and included 13 low risk-of-bias studies from seven countries that tested 21,708 at-risk people. Diagnoses in all studies was confirmed using a real-time reverse transcriptase–polymerase chain reaction test.
The study concluded:
• The relative risk of asymptomatic transmission was 42% lower than that for symptomatic transmission
• The 1 in 6 estimate of the prevalence of asymptomatic COVID-19 cases and asymptomatic transmission rates is lower than those of many previously publicized studies
• Further robust epidemiological evidence is urgently needed, including in subpopulations such as children, to better understand how asymptomatic cases contribute to the pandemic
At a Glance
The rate of asymptomatic COVID-19 presentation is ~17%
Relative risk of asymptomatic transmission is 42% lower than for symptomatic
Earlier estimates that 80% of infections are asymptomatic were too high
To Read the Full Study: Click Here
Source: Byambasuren, O., Cardona, M. et al. Estimating the extent of asymptomatic COVID-19 and its potential for community transmission: Systematic review and meta-analysis. Official Journal of the Association of Medical Microbiology and Infectious Disease Canada 2020 5:4, 223-234. https://doi.org/10.3138/jammi-2020-0030
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