“AAQ,
You are basing this on the assumption that:
a. More exposure equals greater viral load.
b. Once someone is infected, additional contact with other infected persons will result in a greater viral load.
c. Greater viral load is a factor as to how effective the immune response will be.
d. Better ventilation reduces viral load and additional infections.”
AAQ is essentially correct on first 3, and I would qualify #4 that it depends on how much viral load would there be floating around without ventilation and what % is rendered non-viable or is expelled altogether, which can vary widely; and there is not adequate documentation that moderate ventilation, especially for schools, makes much of a difference. (airplanes use top-notch ventilation, and it is strongly implied in the complete lack of significant cases of airplane transmission)