The CDC's revised guidance will still recommend vaccinated people still wear masks when they travel on planes, trains and buses, and in hospitals.
The CDC on Thursday afternoon issued new guidance regarding mask-wearing and businesses.
The new guidance comes as the aggressive USA vaccination campaign begins to pay off. US virus cases are at their lowest rate since September, deaths are at their lowest point since last April and the test positivity rate is at the lowest point since the pandemic began.
"Anyone who is fully vaccinated can participate in indoor and outdoor activities, large or small, without wearing a mask". It's based, she said, on real world data from people who've been vaccinated.
The announcement from the CDC comes just ahead of the Memorial Day and Fourth of July parade season, the date that President Joe Biden previously said he hopes to have enough Americans vaccinated to begin holding events safely.
His comments came hours after the CDC announced that people who are fully vaccinated against Covid-19 do not need to wear masks or practice social distancing indoors or outdoors, except under certain circumstances.
According to the Associated Press, approximately 154 million Americans - more than 46 percent of the population - have received at least one dose of a COVID-19 vaccine.
"I recognize some parents want to see how it goes, but I am encouraging all children to be vaccinated".
"Good point", Biden responded.
"But any other time, if you're vaccinated and you're outside, put aside your mask", Fauci said.
As for unvaccinated people, Walensky said they remain at risk of falling ill with COVID-19 or spreading the virus to others.
"If you are vaccinated, you don't have to wear a mask outside", he added.
The CDC defines "fully vaccinated" as two weeks after receiving a second jab of a two-dose vaccine, or two weeks after the single-dose Johnson & Johnson vaccine.
There are some caveats.
Walensky noted that people with compromised immune systems should speak to their doctors before giving up their masks.