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Effectiveness of Face Mask or Respirator Use in Indoor Public Settings for Prevention of SARS-CoV-2 Infection — California, February–December 2021
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February 4, 2022
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Source: MMWR: Morbidity and Mortality Weekly Report 2022; v. 71 Early Release
[PDF-228.76 KB]
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Corporate Authors:California COVID-19 Case-Control Study Team. ; University of California, Berkeley. School of Public Health. Division of Epidemiology and Biostatistics. ; California. Department of Public Health. ; University of California, Berkeley. School of Public Health. Division of Infectious Diseases & Vaccinology. ; University of California, Berkeley. College of Engineering. Center for Computational Biology.
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Description:What is already known about this topic? Face masks or respirators (N95/KN95s) effectively filter virus-sized particles in laboratory settings. The real-world effectiveness of face coverings to prevent acquisition of SARS-CoV-2 infection has not been widely studied.
What is added by this report? Consistent use of a face mask or respirator in indoor public settings was associated with lower odds of a positive SARS-CoV-2 test result (adjusted odds ratio = 0.44). Use of respirators with higher filtration capacity was associated with the most protection, compared with no mask use.
What are the implications for public health practice? In addition to being up to date with recommended COVID-19 vaccinations, consistently wearing a comfortable, well-fitting face mask or respirator in indoor public settings protects against acquisition of SARS-CoV-2 infection; a respirator offers the best protection.
Suggested citation for this article: Andrejko KL, Pry JM, Myers JF, et al. Effectiveness of Face Mask or Respirator Use in Indoor Public Settings for Prevention of SARS-CoV-2 Infection — California, February–December 2021. MMWR Morb Mortal Wkly Rep. ePub: 4 February 2022.
mm7106e1.htm?s_cid=mm7106e1_w
mm7106e1-H.pdf
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ISSN:0149-2195 (print);1545-861X (digital);
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Pages in Document:6 pdf pages
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Volume:71
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