Surgical masks help prevent the transmission and contraction of COVID-19
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.
The vast majority of retrieved studies—including large observational cohorts, systematic reviews, and fluid dynamics models—demonstrate that surgical masks and related face coverings reduce the transmission and acquisition of SARS-CoV-2. While a few observational studies note methodological challenges or mixed results (such as potential residual confounding in cross-sectional surveys), the weight of evidence strongly supports their protective efficacy, particularly when used consistently.
V. Cheng, Shuk-Ching Wong, V. W. Chuang, S. So, J. H. Chen, S. Sridhar, K. To, J. Chan, I. Hung, P. Ho, K. Yuen. The role of community-wide wearing of face mask for control of coronavirus disease 2019 (COVID-19) epidemic due to SARS-CoV-2. 2020. https://doi.org/10.1016/j.jinf.2020.04.024
Community-wide mask wearing was associated with significantly lower COVID-19 incidence rates in Hong Kong.
Ingeborg Hess Elgersma, Atle Fretheim, Petter Elstrøm, Preben Aavitsland. Association between face mask use and risk of SARS-CoV-2 infection: Cross-sectional study. 2023. https://doi.org/10.1017/s0950268823001826
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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Yu Wang, H. Tian, Li Zhang, Man Zhang, Dandan Guo, Wenting Wu, Xingxing Zhang, G. Kan, L. Jia, D. Huo, Baiwei Liu, Xiaoli Wang, Ying Sun, Quanyi Wang, Peng Yang, C. R. Macintyre. 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. https://doi.org/10.1136/bmjgh-2020-002794
Face mask use by primary cases and family contacts significantly reduced secondary household transmission of SARS-CoV-2.
K. Andrejko, J. Pry, Jennifer F. Myers, N. Fukui, J. DeGuzman, J. Openshaw, J. Watt, J. Lewnard, Seemalata Jain, Yasmine Abdulrahim, C. M. Barbaduomo, Miriam I Bermejo, Julia Cheunkarndee, Adrian F. Cornejo, Savannah Corredor, Najla Dabbagh, Zheng N. Dong, A. Dyke, Anna T. Fang, Diana Felipe, Paulina M. Frost, Timothy Ho, M. Javadi, Amandeep Kaur, A. Lam, Sophia Li, Monique Miller, Jessica Ni, Hye-Sun Park, Diana J Poindexter, Helia Samani, Shrey Saretha, Maya Spencer, Michelle M. Spinosa, Vivian H. Tran, Nikolina Walas, Christine Wan, Erin Xavier. Effectiveness of Face Mask or Respirator Use in Indoor Public Settings for Prevention of SARS-CoV-2 Infection — California, February–December 2021. 2022. https://doi.org/10.15585/mmwr.mm7106e1
Consistent use of face masks or respirators in indoor public settings was associated with significantly lower odds of a positive COVID-19 test.
L. Boulos, J. Curran, A. Gallant, H. Wong, Catie Johnson, A. Delahunty-Pike, L. Saxinger, Derek K Chu, J. Comeau, Trudy Flynn, Julie Clegg, C. Dye. Effectiveness of face masks for reducing transmission of SARS-CoV-2: a rapid systematic review. 2023. https://doi.org/10.1098/rsta.2023.0133
A rapid systematic review concluded that wearing masks generally reduced SARS-CoV-2 transmission in study populations.
Jiaxing Liu, Ming Hao, Shulei Chen, Yang Yang, Jian Li, Qi Mei, Xin Bian, Kun Liu. Numerical evaluation of face masks for prevention of COVID-19 airborne transmission. 2022. https://doi.org/10.1007/s11356-022-18587-3
Computational fluid dynamics modeling demonstrated that surgical and N95 masks drastically reduce the concentration of virus-carrying droplets in a room.
Ali Alkhalaf, Essa M Aljaroudi, Mohammed Alhulami, B. Gaffar, K. Almas. Efficacy of Surgical Masks Versus N95 Respirators for the Prevention of COVID-19 in Dental Settings: A Systematic Review. 2023. https://doi.org/10.7759/cureus.37631
A systematic review indicates that surgical masks and N95 respirators offer protection against COVID-19 infection.
Meenakshi Sharma, H. Sra, Chris Painter, W. Pan-ngum, N. Luangasanatip, Anil Chauhan, S. Prinja, Meenu Singh. 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. https://doi.org/10.1371/journal.pone.0299309
Economic modeling found that surgical masks are cost-effective and significantly reduce viral transmission compared to wearing no mask.
Katrīna Tomiņa, J. Kroiča, Anastasija Dovbenko, I. Skadiņš. Efficacy of Facial Mask Use in COVID-19 Transmission Using a Bacterial Model. 2024. https://doi.org/10.2478/prolas-2024-0013
Analysis confirmed that face masks are effective in detaining excreted microorganisms and protecting wearers from airborne microbes.
Chloe Enright, C. Gilbourne, Rachel Kiersey, R. Parlour, P. Flanagan, Emer McGowan, M. Boland, Deirdre Mulholland. Efficacy of facemasks in preventing transmission of COVID-19 in non-healthcare settings: A scoping review. 2023. https://doi.org/10.1177/17571774231203387
A scoping review found that experimental literature supports the efficacy of masks in preventing COVID-19 transmission.
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