How to Put on and Remove a Face Mask - Disease Prevention and Control, San Francisco Department of Public Health

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A face mask isn't sure protection from coronavirus, but it may be worthwhile — along with these self-defense measures

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Mask Mandate: San Francisco Bay Area health officials issue indoor mask mandate, regardless of vaccination status - ABC7 San Francisco

San Francisco, California and the 1918-1919 Influenza Epidemic The American Influenza Epidemic of 1918: A Digital Encyclopedia

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California to lift mask mandate in indoor public places - Los Angeles Times

Use and Care of Masks

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CDC says fully vaccinated Americans can go without masks outdoors, except in crowded settings - The Washington Post

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Juntos, We Can Stop COVID-19! - Salud America

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Face Masks Are Returning to Hospitals. What's Your Bay Area County Doing?