And yet, despite mounting evidence, people are still opposing even basic measures of hygiene in way too many schools. Air filters, if they are even present, are often just plugged out. Windows can't be opened at all. Way too few loos for way too many students, most of them vandalized to hell, no soap dispensers to be seen.
On top of that come all the parents who send their kid to school despite clearly being sick.
There's also underfunded research on far-UV light, which at the right wavelengths kills pathogens without apparently affecting humans. It might really be that simple.
On top of that come all the parents who send their kid to school despite clearly being sick.