Do children respond differently to COVID-19?

Are children less likely than adults to be infected? Can they transmit the virus to others? Should schools be closed or not?
Novel findings from an Australian study, published in Nature Communications in November, might be a signpost to the direction research needs to go to find answers.
The research suggests children exposed to COVID-19 who show up negative on PCR and conventional serology might be infected but their immune systems can mount a “highly effective” response.
This is based on a case study of a Melbourne family — a 38-year-old mother, 47-year-old father and their three children, aged nine, seven and five.