I would like to see the children's ones split much more:
Let's see positivity rates, and numbers/100k on 0-3, 4-6, 7-9, 10-12, 13-15, 16-18.
Or perhaps even better on school years:
Year R-year 2, Year 3-year 5, year 6-year 8, year 9-year 11, 6th form.
Then I'll make a decision whether it's spreading there.
It seems to me that the age is done to hide school spread.
By putting the 10yos in with the primary it takes the oldest ones, and most likely to show symptoms. By putting the 19yos in the secondary, it means they can just blame uni student freshers.
One of my theories is that children are not tested always if it's similar symptoms in a family. If I had symptoms and one of the dc had symptoms, I'd be tempted to get me tested and go by that, as it's quite a nasty test.
Add into that parents who don't want to have to isolate so won't test in case "mild cold symptoms/D & V, will send them back when they're better", plus children seem to have different symptoms, may add into fewer children being tested.
Schools aren't allowed to ask to see a negative test result, parents might easily lie that they've been for a test and got a negative result to get back in.
But to me it's the asymptomatic that's worrying me. At the uni where they tested lots, 90% were asymptomatic. It's meant to be more often asymptomatic as they get younger, but you can still spread it even if you are asymptomatic.
So if you have a class of 30, and they all had it, that's 3 with symptoms if 90% are asymptomatic.
That's one to get tested, one for the parents to dose up on calpol and pretend they didn't notice they had a fever and one to get kept off school but not tested.
And 27 children to spread it without people even realising, and for the government to call it an isolated case.