The World Health Organization issued the statement as the novel coronavirus, calling it an "unprecedented outbreak." Here's what we knew — and didn't know — about the virus at that time.
The U.S. needs to ensure everyone has an equitable chance to protect themselves, and if people don't have that opportunity, they need to be able to rely on others to be compassionate, he says.
Several studies over the past year and a half have arrived at the same conclusion: mask wearing significantly limits transmission of the coronavirus in schools.
Researchers looked at the impact of free masks, text reminders and celebrity endorsements. It's unclear if the best strategies will help counter anti-mask sentiment in the U.S. during the delta surge.
Yes, that was the plan. Then along came the delta variant. And now people who are vaccinated are wondering: Are there circumstances in which a mask would be advisable?
Masks are optional for vaccinated kids, and other recommended restrictions have been softened, making for a more relaxed camping experience for children this summer.
But the CDC is urging all people — vaccinated or not — to continue avoiding medium or large gatherings since it's still learning how well the vaccines work to curb the spread of the virus.
No vaccine is 100% effective. Though so-called "breakthrough" COVID cases are rare, the virus is circulating widely. What's a vaccinated person to do? And ... not do?