https://www.nature.com/articles/s41598-022-15409-x
https://media.springernature.com/full/springer-static/image/art:10.1038%2Fs41598-022-15409-x/MediaObjects/41598_2022_15409_Fig4_HTML.png

こんなバイ菌まみれの布切れなんて着ける方が不潔

https://www.sciencedirect.com/science/article/pii/S2590170221000248
>Combining several of the studies favored not wearing a mask in prevention of surgical site infection.
>The results indicate no difference in surgical site infections between mask and maskless operations.

オペ時のマスク着用は手術部位感染を減らさない(どころか逆効果)
外科医でこのザマだからましてや飲食店員ならお察し