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Children and COVID-19 Research Library

UNICEF Innocenti's curated library of COVID-19 + Children research

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Age-dependent effects in the transmission and control of COVID-19 epidemics

AUTHOR(S)
Nicholas Davies; Petra Klepac; Yang Liu

Published: July 2020   Journal: Nature Medicine
The COVID-19 pandemic has shown a markedly low proportion of cases among children. Age disparities in observed cases could be explained by children having lower susceptibility to infection, lower propensity to show clinical symptoms or both. We evaluate these possibilities by fitting an age-structured mathematical model to epidemic data from China, Italy, Japan, Singapore, Canada and South Korea. We estimate that susceptibility to infection in individuals under 20 years of age is approximately half that of adults aged over 20 years, and that clinical symptoms manifest in 21% (95% credible interval: 12–31%) of infections in 10- to 19-year-olds, rising to 69% (57–82%) of infections in people aged over 70 years. Accordingly, we find that interventions aimed at children might have a relatively small impact on reducing SARS-CoV-2 transmission, particularly if the transmissibility of subclinical infections is low. Our age-specific clinical fraction and susceptibility estimates have implications for the expected global burden of COVID-19, as a result of demographic differences across settings. In countries with younger population structures—such as many low-income countries—the expected per capita incidence of clinical cases would be lower than in countries with older population structures, although it is likely that comorbidities in low-income countries will also influence disease severity. Without effective control measures, regions with relatively older populations could see disproportionally more cases of COVID-19, particularly in the later stages of an unmitigated epidemic.
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UNICEF Innocenti's Children and COVID-19 Library is a database collecting research from around the world on COVID-19 and its impacts on children and adolescents.

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COVID-19 & Children: Rapid Research Response

UNICEF Innocenti is mobilizing a rapid research response in line with UNICEF’s global response to the COVID-19 crisis. The initiatives we’ve begun will provide the broad range of evidence needed to inform our work to scale up rapid assessment, develop urgent mitigating strategies in programming and advocacy, and preparation of interventions to respond to the medium and longer-term consequences of the COVID-19 crisis. The research projects cover a rapid review of evidence, education analysis, and social and economic policies.