Effectiveness of Face Mask or Respirator Use in Indoor Public Settings for Prevention of SARS-CoV-2 Infection — California, February–December 2021

An evidence review of face masks against COVID-19

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Inward and outward effectiveness of cloth masks, a surgical mask, and a face shield

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Effectiveness of Mask Wearing to Control Community Spread of SARS-CoV-2

(2021) John T. Brooks et al.   JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION

Maximizing Fit for Cloth and Medical Procedure Masks to Improve Performance and Reduce SARS-CoV-2 Transmission and Exposure, 2021

(2021) John T. Brooks et al.   MMWR-MORBIDITY AND MORTALITY WEEKLY REPORT

Theoretical framework for retrospective studies of the effectiveness of SARS-CoV-2 vaccines

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Predictors of Severe Acute Respiratory Syndrome Coronavirus 2 Infection Following High-Risk Exposure

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