Surgical masks help prevent the transmission and contraction of COVID-19
the verdict
SUPPORTED
the evidence backs this
confidence 74/100
Substantial observational and modeling evidence indicates that surgical masks and other face coverings help prevent the transmission and contraction of COVID-19, though their real-world effectiveness can be influenced by consistency of use and external factors.
Evidence for · 9
The role of community-wide wearing of face mask for control of coronavirus disease 2019 (COVID-19) epidemic due to SARS-CoV-2
2020 · cited by 782
Community-wide mask wearing was associated with significantly lower COVID-19 incidence rates in Hong Kong.
Evidence against · 1
Association between face mask use and risk of SARS-CoV-2 infection: Cross-sectional study
2023 · cited by 8
A cross-sectional study found a higher incidence of self-reported COVID-19 among frequent mask wearers, though noting potential unobservable confounding.
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More for · 8
Reduction of secondary transmission of SARS-CoV-2 in households by face mask use, disinfection and social distancing: a cohort study in Beijing, China
2020 · cited by 484
Face mask use by primary cases and family contacts significantly reduced secondary household transmission of SARS-CoV-2.
Effectiveness of Face Mask or Respirator Use in Indoor Public Settings for Prevention of SARS-CoV-2 Infection — California, February–December 2021
2022 · cited by 193
Consistent use of face masks or respirators in indoor public settings was associated with significantly lower odds of a positive COVID-19 test.
Effectiveness of face masks for reducing transmission of SARS-CoV-2: a rapid systematic review
2023 · cited by 49
A rapid systematic review concluded that wearing masks generally reduced SARS-CoV-2 transmission in study populations.
Numerical evaluation of face masks for prevention of COVID-19 airborne transmission
2022 · cited by 26
Computational fluid dynamics modeling demonstrated that surgical and N95 masks drastically reduce the concentration of virus-carrying droplets in a room.
Efficacy of Surgical Masks Versus N95 Respirators for the Prevention of COVID-19 in Dental Settings: A Systematic Review
2023 · cited by 6
A systematic review indicates that surgical masks and N95 respirators offer protection against COVID-19 infection.
Cost-effectiveness analysis of surgical masks, N95 masks compared to wearing no mask for the prevention of COVID-19 among health care workers: Evidence from the public health care setting in India
2024 · cited by 6
Economic modeling found that surgical masks are cost-effective and significantly reduce viral transmission compared to wearing no mask.
Efficacy of Facial Mask Use in COVID-19 Transmission Using a Bacterial Model
2024 · cited by 1
Analysis confirmed that face masks are effective in detaining excreted microorganisms and protecting wearers from airborne microbes.
Efficacy of facemasks in preventing transmission of COVID-19 in non-healthcare settings: A scoping review
2023 · cited by 1
A scoping review found that experimental literature supports the efficacy of masks in preventing COVID-19 transmission.