It’s interesting how diseases rip through schools at incredible speeds despite being in an arguably modern, clean(ish) environment. I wonder if it has something to do with the whole “you need a doctor’s note to excuse your absence of even one day” combined with the average price of going to a doctor, the lack of education on things like “you’re still contagious even after the fever goes away”, and the overwhelming message of “if you don’t struggle through it, you’re a failure!”
A lot of public schools are also just not fucking “modern” or clean to begin with. If there’s mold in the AC or the bathroom plumbing is constantly leaking/not flushing waste properly or the building is falling apart in the winter, people WILL get sick. this is especially common in poor neighborhoods and it takes a long-term toll on people’s health by weakening their immune system which makes it easier to spread the flu around and so on and so forth