U.S. mandates negative Covid test for flights from the United Kingdom

The United States will require airline passengers coming from the United Kingdom to test negative for coronavirus before flying, the Centers for Disease Control and Prevention announced Thursday evening, amid reports of the spread there of a new strain of Covid-19 that health authorities believe is significantly more contagious.

Passengers will have to test negative within three days before flying and must be denied boarding if they refuse to be tested, the CDC said. The restriction will be put into force as of Dec. 28.

“This additional testing requirement will fortify our protection of the American public to improve their health and safety and ensure responsible international travel,” the CDC said in a statement.

The mutated strain of Covid-19 discovered in the U.K. is believed to be up to 70 percent more transmissible than other strains, though it may not be any more lethal.

The administration had previously been reluctant to mandate a health screening for flights from the U.K., but simply recommended it. Some governors, chief among them New York's Andrew Cuomo, had called for the feds to go even further and shut down flights from the U.K., as some other countries have done.

On a Dec. 22 appearance on "Good Morning America," director of the National Institute of Allergy and Infectious Disease Dr. Anthony Fauci called a travel ban a "dramatic step" that didn't appear to be imminent, and suggested that it's likely already spreading inside the United States.

"That's certainly possible I mean, when you have this amount of spread within a place like the U.K., that you really need to assume that it's here already, and certainly is not the dominant strain, but I would not be surprised at all if it is already here," Fauci said.

Passengers wishing to travel from the U.K. must get a PCR or antigen test and provide written documentation of the result to their airline, which will be required to double-check the result before they allow a passenger to board.