Under 20s around half as susceptible to COVID-19 - study

People under the age of 20 are half as likely to contract COVID-19 than the rest of the population, according to new modelling released on Tuesday that suggests four out of five infected young people show no symptoms. The research could help inform the next moves of governments under pressure to reopen schools and colleges shuttered since the start of the pandemic.

People under 20 are around half as susceptible to COVID-19 as people aged 20 or above, according to research published on Tuesday, and clinical symptoms of the pandemic disease appear in only about a fifth of infections in children and teens.

The research, a modeling study using data from 32 locations China, Italy, Japan, Singapore, Canada and South Korea, found that by contrast, COVID-19 symptoms appear in 69% of infections in people aged 70 or older.

The findings suggest that school closures - introduced in many countries as part of lockdowns aimed at controlling the coronavirus pandemic - are likely to have a limited impact on the transmission of the disease, the researchers said.

Published in the journal Nature Medicine, the study compared the effect school closures on simulated outbreaks of flu - which is known to spread swiftly in children - and of COVID-19, the disease caused by the new coronavirus.

"For COVID-19, there was much less of an effect of school closures," said Rosalind Eggo, an infectious disease modeller at The London School of Hygiene and Tropical Medicine who co-led the study.

She added, however, that the findings come from simulated outbreaks and need to be reinforced with real-world research.

Using demographic data from the six countries, as well as from six studies on estimated COVID-19 infection rates and symptom severity across different age groups, the model showed that people under 20 are about half as susceptible to COVID-19 as people over 20, and that among 10 to 19 year-olds, only 21% of those infected had clinical symptoms.

The researchers also simulated COVID-19 epidemics in 146 capital cities around the world and found that the total expected number of clinical cases varied with median age.

"The age structure of a population can have a significant impact," said Nicholas Davies, who co-led the work. "Countries with more young people may experience a lower burden of COVID-19."



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