Researchers at the University of Toronto have found that immune cells from the upper respiratory tracts of children, taken years before the pandemic began, react with the virus that causes COVID-19.
The findings hint at a possible reason why children with COVID-19 are often asymptomatic or have mild symptoms, while many adults experience severe disease and even death….
https://www.utoronto.ca/news/u-t-research-may-help-explain-immune-response-covid-19-children
