http://www.newsweek.com/do-cloth-masks-work-against-covid-new-cdc-guidelines-2022-n95-1670004 > The U.S. Centers for Disease Control and Prevention (CDC) updated its mask-wearing advice over the weekend to clarify that some masks are more effective at preventing the spread of COVID than others and that people should "wear the most protective mask you can that fits well." > The agency also removed concerns relating to supply shortages of N95 masks—though it continues to advise that N95 masks labelled "surgical" should be reserved for healthcare personnel use.