A proof-of-concept study finds some commonly used facial coverings may perform worse than no mask at all.

A model scenario concludes that frequent testing with fast turnaround is key to avoiding campus outbreaks of COVID-19, even if the tests are imperfect.

Face coverings prevent wearers from spreading pathogens, and might also limit the number of viral particles that enter the body, staving off severe infection, including COVID-19, research indicates.

As communities and businesses reopen amidst the pandemic, masks—in addition to other social distancing measures—are crucial for preventing new outbreaks.

Not all masks are created equal, and how they are worn makes a difference too.