Evidence Shows Yes, Masks Prevent COVID-19 and Surgical Masks

By Laura (Leyla) H. Kwong, University of California, Berkeley Do masks work? And if so, should you reach for an N95, surgical mask, cloth mask, or gaiters? Over the past year and a half, researchers have produced a wealth of laboratory, model-based and observational evidence of the masks’ effectiveness. It has been understandably difficult for …

Should Fully Vaccinated Persons Wear Masks Indoors? infectious

By Peter Chin-Hong, University of California, San Francisco With highly contagious delta coronavirus variant spreading at an alarming rate, The World Health Organization announced people in late June 2021. again, wear masks indoors – even those who are fully vaccinated. And on July 15, Los Angeles County, California, announced that it would be required again. …