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Please tell me how a double blind study of masks and covid transmission would get past an ethics committee.
The Danish actually did this. https://www.acpjournals.org/doi/10.7326/m20-6817
The conclusion was that mask wearing does not by itself significantly change the chance of being infected in a low to moderate Covid infection environment with high adherence to social distancing and other measures in place.
Edit: The study was also conducted when restaurants, bars and other indoor activities were not possible.
Edit2: The study also acknowledged that it did not account for people being infected at home whilst not being masked.
Stonehedge
Please tell me how a double blind study of masks and covid transmission would get past an ethics committee.