But would that not be the case in all areas, as schools are open everywhere?
In theory yes, but it's only since halfterm it's really taken off in secondary schools here.
Before halfterm it was small amounts of close contacts from one year isolating. In the last fortnight one has closed completely, another is on fairly large partial closure and the other is rife with it too.
Again before half term, the only local people I'd known who had positive results were in the older category. Now it's all children and parents, and considerably more numerically.
I think the issue is that once it's in the school it can go round like wildfire. It hadn't got a hold in schools earlier, now it has.
That's not saying that it couldn't happen in other areas, I'm just saying that's what seems to have happened in ours, and why lockdown hasn't effected the growth.
Before half term I think the dc's secondary had six positive cases (mostly staff), and all as far as they could tell unconnected. On Friday alone there were three cases from one year.