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| 1926 || || || A clinical study first demonstrates a potential link between wearing masks and reduced surgical site infection.<ref name="Aschenbrenner"/> ||
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| 1927 || || || "One year later, German surgeon {{w|Martin Kirschner (1879–1942), who held the chair for surgery in Heidelberg, elaborately described }} describes the necessity of wearing a facemask in his multi-volume operational theory in the chapter ‘measures ''Measures to combat infections’"infections''.<ref name="Fangerau"/> ||{{w|Germany}}
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| 1927 || || || "In 1927, Edwin Jordan’s definitive study, published in the Journal of the American Medical Association as a series of articles and then as a book, determined that masks were effective when worn by patients already sick or by those directly exposed to victims, including nurses and physicians. Jordan also acknowledged, however, that “masks are uncomfortable and inconvenient, as anyone who has worn them can testify” and require a great deal of “discipline, self-imposed or other.” Jordan came to a more guarded conclusion: “The effect of mask wearing throughout the general community is not easy to determine.”"<ref name="healthaffairs.orgrr">{{cite web |title=Flu Masks Failed In 1918, But We Need Them Now |url=https://www.healthaffairs.org/do/10.1377/hblog20200508.769108/full/ |website=healthaffairs.org |accessdate=17 September 2020}}</ref> ||
