I wonder if the low numbers are, in part, due to younger children showing different/milder symptoms or being a symptomatic. If this is the case, they probably aren’t being tested and there a far more cases than reported. They could pass it on to family members or in the community and there will be no way to trace where it came from.
Yep, I think that's probably the case too. The number of children with the 'other' covid issues is huge - headaches, fatigue etc. And it's not down to lack of fresh air or to dehydration!! Water bottles are the bane of my life.
I wondered also whether for the most part (but not all the time), teachers are just above the mouth and nose line of younger primary children. I know we have spit and snot issues, but we're mostly above their breathing and shouting zones. If droplets fall, then it's not near us.
I'm making stuff up, same as most people... just guessing.