The number of children I know who have NOT had a previous covid infection is I think now 1. No, actually, 2 if you count the one that's dropped out of school due to health problems (which her consultant has said can be exacerbated by covid) and so is homeschooling.
The entire of DD1s secondary class have all had it at least one, most of them twice, some three times.
All of her teachers have had it at least once, most of them twice, some three times.
The percentage of kids who haven't had it at all in the UK now must be vanishingly small for any not CEV / CV / homeschooling. And of course now we don't even have to test, many more will have had it without a positive test or even knowing.
Given the known and proven increase in risk of other conditions post covid, it's a bit of an issue that we won't know for sure any more, but I don't think doctors will go far wrong by assuming if they're in school they've had it at some point.
Any children in UK schools will have had great exposure to bugs since sept 2021, mine have been off loads with various viruses, they've definitely not had any lower exposure than pre-covid. 75% of the class were in from JAn-March 8th 2021, so only two months off anyway and most children in (without masks or social distancing).
UK schools don't allow for social distancing.
It'll be interesting to see the rate of overall illness in UK kids - schools without mitigations - compared to those countries where they have had mitigations. We'll eventually know what's been important but far too late to do anything about it other than pick up the pieces either way.
I agree that for younger children - the 0-3 cohort - baby groups were shut for longer so those children not in nursery (wonder what percentage that is?) will have had lower than normal exposure. But not kids in school. Are the rates of hepatitis higher in the 0-3 than the 5-16 cohort? Because that would be suggestive of reduced exposure to bugs being an issue. If not, then not really.