Ellianne
I'm not sure that "all will be fine" in schools because proper social distancing won't be possible. Schools will, however, be safer than supermarkets for example because they will see the same pupil footfall every day rather than hundreds of random customers. Also pupils, by their very nature, should be more ready to comply with and follow the rules laid down by their teachers.
There will be cases in schools, that is inevitable. I just hope the schools will jump on it immediately and limit the damage by removing all those involved.
That's not true. A secondary school teacher is likely to be in contact with 150 pupils a day with no perspex screen between them.
The pupils themselves will, as far as possible, be staying in class groups of 30 pupils for five hours a day. Many classrooms are too small for social distancing of one metre (never mind two metres, which is the recommended distance without some form of PPE) and many are poorly ventilated with windows which don't open.
It's known that the two main factors which affect transmission are distancing and length of time in contact with an infected person. If you actually wanted to dream up ideal conditions for transmission, it would be difficult to think of anything more ideal than a secondary school classroom.
It doesn't matter how well-behaved the pupils are. If the classrooms aren't big enough and the pupils have to sit too close together for hours on end, it's inevitable there will be transmission and infection will be passed on to siblings and other family members and parents' colleagues, etc etc.
How can schools "jump on it quickly" if many pupils are asymptomatic and it's difficult to get testing?
The only solution is to minimise transmission in the first place, which it's why it would be sensible to have some kind of rota system, so class sizes could be smaller. The government knows that very well, which is why it's investing in the development of online resources for blended learning.
If, after a few weeks of a rota system, there is very little increase in transmission, return to full classes could be attempted, rather than using pupils, staff and vulnerable family members as guinea pigs and only reacting when an unacceptable number of deaths have occurred (whatever an "unacceptable" number is).