The U.S. Centers for Disease Control and Prevention issued a new coronavirus testing mandate for travelers coming from the U.K. with the goal of blocking the spread of a new virus variant that originated in England.

LOS ANGELES, CALIFORNIA – DECEMBER 22: People wait in line to check in near a sign pointing to a COVID-19 testing area in the Tom Bradley International Terminal at Los Angeles International Airport (LAX) amid a COVID-19 surge in Southern California on December 22, 2020 in Los Angeles, California. TSA agents screened over 1 million people for three consecutive days last Friday, Saturday and Sunday, the beginning of the traditional holiday travel season, for the first time since the start of the coronavirus pandemic. (Photo by Mario Tama/Getty Images)