The Centers for Disease Control and Prevention has amended its guidance for fully vaccinated Americans, no longer recommending masks indoors or outdoors, including in crowds, CDC Director Rochelle Walensky announced at a White House briefing Thursday.

"If you are fully vaccinated, you can start doing the things that you had stopped doing because of the pandemic," Walensky said, announcing the sweeping change. "Anyone who is fully vaccinated can participate in indoor and outdoor activities, large or small, without wearing a mask or physical distancing."