I gather Russell Viner has been on the radio to tell us again about how schools are not a source of COVID transmission. So here are a few graphs about what's been happening in Bolton. First, let's look at which age groups currently have the highest rates of infection. 
What a surprise -- it's school children. But note there's a separate peak with a mode among the 35-39 year age group. Which just happens to correspond to parents of school-age children. I wonder where they got it from?
OK, but maybe the direction of transmission is from parents to childrens, you say? No. Look at this graph and observe how infection spread out from children/teenagers.
And *when* did infections rise in school children? There've been relatively high rates throughout 2021, but they rose steeply when school went back in March, then fell back down over Easter vacation. But then school went back, with B.1.617.2 now in circulation, and cases exploded
Some are still arguing about whether herd immunity was ever Govt strategy, but DfE policy strongly suggests that it *never stopped* being the strategy for children. How else to explain the recent relaxation of mask requirements, to take but one example?
https://twitter.com/i/status/1396716497179906053
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