US health officials say they will require all air travelers bound for the United States to undergo coronavirus tests prior to departure, starting later this month.
The US Centers for Disease Control and Prevention, or CDC, announced the requirement on Tuesday.
It says air passengers going to the US will be required to receive a virus test within three days of their flight's departure. The passengers must then submit their negative test results to the airlines or documents stating that they have recovered from COVID-19.
The CDC says airlines must deny passengers permission to board, if the individuals do not provide such documents.
The CDC says the requirement will become effective on January 26.
It cited variants of the coronavirus emerging in countries around the world as a factor behind the move.
Johns Hopkins University says the number of coronavirus cases in the US has topped 22 million. The total number of deaths has surpassed 380,000. Some states even require tests for people traveling within the country.