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 …