[quote Chestnutacorns123]@noblegiraffe how do you know secondary schools are the main sourse of transmission. I read the graphs as 0-9 very low rates. 10-19, similar on the whole to other working age groups but at the higher end. This group is not solely made up of secondary children. Some 18 and 19 year olds are working, attending college, going to bars and restaurants. You cannot therefore assume, their covid has been caught at school.[/quote]
Secondary school kids, that is, Y7-Y11, not 18 and 19 year olds, are the most infected subset of the population, per ONS random sampling which doesn't rely on people with symptoms getting tests.
I didn't say that schools were the main source of transmission. They certainly appear to be the main source of infection for that age group, backed up by PHE surveillance reporting. And now the government are finally concerned that they might take it to grandma at Christmas so transmission to more vulnerable groups is also a concern.