Interesting STUDY on the risks of #COVID19 infection in a university setting in China.
The risk of infection of susceptible students per 45-min lesson was 1%. (That adds up fast with 15 classes/week for many students.)
An occupancy rate of 50% reduced infection risk by 62%.
Fresh air decreased risk by 81.1%.
All students wearing N95 respirators reduced risks by 96%.
So, which of these mitigations are we doing to protect students? None. We are doing none of them.