"I still continue to worry that with 80% of the population unvaccinated, we still have a lot of work to do", Walensky said.
Until then, there remain some precautions fully vaccinated people should take in public, including wearing masks, keeping a social distance and avoiding crowds.
The Centers for Disease Control and Prevention updated its travel guidelines to say that fully vaccinated Americans can fly nationwide without much trouble. Of the fully vaccinated people, over 28 million received both Pfizer-BioNTech doses, over 24 million received both Moderna shots, and over 3 million received the Johnson & Johnson vaccine.
Confirming progress in the United States vaccination campaign, President Joe Biden pledged last week that 90 percent of adults will be eligible for vaccinations by April 19.
According to a COVID-19 vaccine tracker from The New York Times, providers are administering about 2.9 million vaccine doses a day.
Biden had promised that the United States would administer 100 million vaccines by his 100th day in office, but he surpassed that number weeks ahead of his goal.
President Joe Biden announced last week that his administration planned to administer 200 million vaccine doses to Americans in his first 100 days in office.
Fully vaccinated people can start traveling again if they take precautions such as wearing a mask and observing social distancing, USA health authorities said Friday.
The major USA airlines including American Airlines, Delta Air Lines, United Airlines, Southwest Airlines, and other trade groups had asked the CDC on March 22 to change its guidance to say "vaccinated individuals can travel safely".