Hmm.
My dad has it now. And is off, and her baby sister is on prevention antibiotics
She also had it as covid broke, and her sister had it march this year.
I couldn't get penicillin anywhere last night (rural Scotland) but with some help from friends got it today, albeit a long drive.
She has it because a mother sent her child in with it to the small nursery, Friday. She had been given antibiotics Thursday, which she disclosed Friday evening on social media.
So, I suppose, my answer would be, any signs of fever, throat, sickness, go to doctor.
Dd unlikely to be back before Xmas and yet again will miss so much.
But the sad reality is unless your school has allowed an extremely unwell child in, hence my row with them, on antibiotics, day one, then the exposure will have happened and keeping them home now won't help much.