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デンマークの試験:Effectiveness of Adding a Mask Recommendation to Other Public Health Measures to Prevent SARS-CoV-2 Infection in Danish Mask Wearers
https://www.acpjournals.org/doi/10.7326/M20-6817
フランスでの試験:Surgical Mask to Prevent Influenza Transmission in Households: A Cluster Randomized Trial
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2984432/
日本での調査:サージカルマスクのインフルエンザ予防効果
https://www.thcu.ac.jp/uploads/imgs/20171024085000.pdf
1981年イングランドでの試験:Is a mask necessary in the operating theatre?
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2493952/pdf/annrcse01509-0009.pdf