From [Effectiveness of personal protective measures in prevention of nosocomial transmission of severe acute respiratory syndrome]:

"Univariate analysis showed that mask, gown, gloves, goggles, footwear, "hand-washing and disinfecting", gargle, "membrane protection", "taking shower and changing clothing after work", "avoid from eating and drinking in ward", oseltamivir phospha tall had protective effects (P < 0.05), but stepwise logistic regression showed significant differences for mask (OR = 0.78, 95% CI: 0.60 - 0.99), goggles (OR = 0.20, 95% CI: 0.10 - 0.41) and footwear (OR = 0.58, 95% CI: 0.39 - 0.86). "

This paper is about protecting healthcare workers from infection with the old SARS which seems near to SARS-COV-2. Unfortunately, the main text is in Chinese so it's unclear to me what they did about footwear that was effectful.

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