According to the CDC, anyone flying to the U.S. will soon need to show proof of a negative COVID-19 test.
The new requirement is designed to try and prevent travelers from bringing in newer forms of the virus that scientists say can spread more easily.
The CDC's order will take effect on January 26.
The order requires air passengers to get a COVID-19 test within three days before their flight departs to the US, and to provide written proof of the test result to the airline.
Travelers can also provide documentation that they had an infection in the past and recovered.
Airlines are ordered to stop passengers from boarding if they don’t have proof of a negative test or a prior infection.