References:
Community and Close Contact Exposures Associated with COVID-19 Among Symptomatic Adults 18 Years or more in 11 Outpatient Health Care Facilities - United States, July 2020
How COVID-19 Spreads
Comparison of Filtration Efficiency and Pressure Drop in Anti-Yellow Sand Masks, Quarantine Masks, Medical Masks, General Masks, and Handkerchiefs
Non-pharmaceutical public health measures for mitigating the risk and impact of epidemic and pandemic influenza
Universal Masking in Hospitals in the Covid-19 Era
403forbidden.us Masking Page
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