when I check w/ Ivermectin, I did not see any large studies quantifying the effect, so it is hard to judge. Given the low cost, I am surprised why the proponents were not able to organize that.
I was wondering about nasal sprays myself. This would make sense, provided population can do it. Are there any reliable studies on that?
Masks – I quoted recently a large high-quality study from Bangladesh about effects of masks in real communities. It is very convincing.
SD – I am not calling for anyone (outside of my family) to do hasidut. But everyone could do some reasonable steps according to their abilities – limit travel, parties, stay home for a couple of days after visiting hotspots, do not leave kids with grandparents after schools, open windows in schools, etc. I see, unfortunately, a lot of people who would not lift a finger. There is no charitable explanation for that.
Ventilation, again, would you be interested in testing CO2 levels in mosdos around you? Unlike mouth and hand-washing, this does not require making population do something daily – you can find who has bad ventilation and administration will fix it. Simple, non-intrusive measure.