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Face masks have long been used for various reasons in health care. During the COVID-19 pandemic, they have become a critical form of personal protection for many people—from doctors to ordinary people out for a walk. But can face masks really protect against the spread of infectious respiratory diseases, like SARS and COVID-19?
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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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Do Face Masks Protect The Wearer From Coronavirus? Yes, Says CDC : Shots - Health News : NPR
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Summary of Guidance for Public Health Strategies to Address High Levels of Community Transmission of SARS-CoV-2 and Related Deaths, December 2020
Face masks with valves or vents do not prevent spread of coronavirus, CDC says
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How to Put on and Remove a Face Mask - Disease Prevention and Control, San Francisco Department of Public Health
Do face masks work? Here are 49 scientific studies that explain why they do