Do children get the virus?
How severely do they get the virus?
Do they pass it on to others?
While we know for sure that children can catch the virus, Prof Viner says data from antibody blood tests suggest they may be less susceptible to catching it than adults - particularly children under the age of 12.
And scientists are very confident that children are less likely to become ill than adults even if they do catch it, with many not showing any symptoms at all. That's what the British study, published on Friday, confirms.
The third question is the one we know least about, and it's this the South Korean study attempts to address.
What does the South Korean study say?
The study, based on 91 children, found that even among those with few or no symptoms, virus could be found in their swabs as much as three weeks later.
The fact they had detectable virus in their noses, the authors concluded, suggested they were capable of passing it on.