Earlier quoted context omitted.
If they’re spending the whole day in a classroom together the effect of masks is going to be minimal.
That's simply not what the research has found. Edit: Allow me to clarify - the research everyone is citing that says masking is effective in teachers and ineffective in students (the 37% number) predates both the delta variant and widespread infection in Southern states. Further, masking is understood etiologically as a prevention method and has been used successfully in other outbreaks and in other countries. Clinic…
My understanding was that masks were primarily effective at preventing high viral load droplets from spreading the virus during short interactions.
I don't have any source to prove that to be the case because data on the effectiveness of masks seems frustratingly sparse.