About 7. It would be lower if government would acknowledge true situation in schools, even if they still went ahead with the same action plan, rather than implying kids don't live with anyone else and a virus can't spread in a packed room. It is pure and simple gaslighting. If kids don't spread it, why can't they meet up with anyone now? Technically, my five year old is meant to meet a friend on his own to exercise!
The mental health toll on people is also massive - both with and without lockdown (e.g. kid who brings covid home from school and covid kills a parent to kid whose parent has lost their income due to lockdown or illness from covid and loses their home, to domestic violence).
On a very conservative level, if all kids at school did nothing else but go to school, if all staff at school did the same, if all the people they all lived with did not leave the house, that's still a lot of exposure to the virus within the overall population. So, whilst the percentage risk to kids of dying is small, long covid is not, nor is overall damage to lung tissue etc in kids who have had it asymptomatically, nor is the risk to those they bring it home to. A small percentage of a large number is still a large number!
Those that have been vaccinated are likely to take more risks now, others who have not been vaccinated are likely to mix more with those that have been vaccinated as less scared about passing things on etc. People who have been vaccinated can still transmit though! I'm worried about giving the virus perfect chance to mutate and adapt to that.
I would feel more comfortable with a rota system until we have a better handle on things and a more robust long term strategy of living and coping successfully with the virus. I'm far from convinced this all or nothing approach is the right one at this stage.
I'd also feel more comfortable with expanding the list of symptoms to test for and properly trying to stamp out outbreaks (not suggesting we try to become covid-free), just go a bit further than just isolating the person who sat next to you for testing positive!