"It's possible that some people who are fully vaccinated could get Covid-19". In other words, "authorized mRNA COVID-19 vaccines are effective for preventing SARS-CoV-2 (the virus that causes COVID-19) infection in real-world conditions".
A CDC spokesperson told The New York Times that Walensky "spoke broadly" and that the evidence to support her claim "isn't clear".
As it stands, the new travel measures don't mention whether people need proof of vaccination to travel, but for now, US airlines don't require official documentation.
The CDC said COVID-19 tests are won't be required for fully vaccinated people before or after they travel within the USA - as long as those travelling wear masks on planes, buses, and trains.
However, CDC Director Rochelle Walensky said that while people can travel, they still should avoid doing so.
As per the new guidance, fully vaccinated people can travel within the USA without requiring testing or post-travel self-quarantine as long as they continue to take precautions against Covid-19 while travelling.
Fully vaccinated Americans can travel again, says new U.S. CDC guidance
A person is considered fully vaccinated two weeks after receiving the last required dose of vaccine. CDC also said those who are not fully vaccinated should avoid non-essential domestic travel.
In another statement, U.S. Travel Association president and CEO Roger Dow said, "The CDC's new travel guidance is a major step in the right direction that is supported by the science and will take the brakes off the industry that has been hardest hit by the fallout of COVID by far". And the CDC recommends people test negative before coming back to the U.S.
The CDC still discourages "nonessential domestic travel" by those who aren't fully vaccinated.
The CDC has been slowly offering guidance on what people can do once fully vaccinated.
A person is considered fully vaccinated two weeks after the last recommended dose of the vaccine. They, however, needn't quarantine.
The new guidance Friday is welcome news for many Americans who haven't visited family members or traveled in a year.