“Nearly all the staff at Johns Hopkins Bloomberg School of Public Health are vaccinated against Covid-19. Yet they are all still wearing masks to work. These researchers, who are among the most well-versed in the tricks of the coronavirus, aren’t taking any chances. They’re advising the rest of the country and the world to be similarly careful as strains like the Delta variant arise and spread.” Rise of Delta variant brings mask question back, even for the vaccinated.

+ Should vaccinated people wear face masks or not? How the CDC and WHO disagree.