TL;DR - factors that could have potentially resulted in this is - less coughing by infected patients, good ventilation, volunteer adults which were healthy were mostly middle aged which is less likely to be infected. We need to do more trials to understand how seasonal flus work.
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“Good ventilation” seems to be a forgotten art in US architecture.
In Europe, they were opening the windows in schools during the COVID pandemic to help cut down on transmission. Can’t do that in the US because modern school building windows don’t open (if the schoolroom even has windows). Same for modern office buildings.
Even manually opening the windows is a poor way to have air circulation. We should have proper ventilation in place, but that costs money…



