They think kids are carriers of sorts ,they can get it and they can get symptoms but not much aside from the rare ones who have died,most people get no symptoms or get a mild/moderate illness that they might not think is covid,they are passing it on without knowing ,that is why everyone is on some kind of lockdown,we are protecting each other,to illustrate the point
The daughter whose mum died and her dad is battling it
Mrs Wright died at Furness General Hospital in Barrow-in-Furness, Cumbria, last Wednesday after battling the virus for days.She and her husband caught the illness even though they hadn't left their house for weeks, said Mrs Buchanan
They were, however, visited by care workers and medical professionals while they were shielding, she added
https://www.mirror.co.uk/news/uk-news/coronavirus-devastated-daughter-shares-final-21969433
Those visiting wouldn't have gone if they had symptoms,they would have been at home isolating but clearly somebody had it but didn't know it,one of the keys going forward is to find out how many have it with no symptoms