Travelers flying into the United States from international destinations will be required to show proof of a negative COVID-19 test before boarding their flight. The U.S. Centers for Disease Control and Prevention announced the new policy Tuesday and said it will go into effect Jan. 26. The agency said it hopes the new testing requirement will help slow the spread of the virus, currently surging in the United States, as the vaccine rollout continues. “Testing does not eliminate all risk,” CDC Director Robert R. Redfield said in a statement,“but when combined with a period of staying at home and everyday precautions like wearing masks and social distancing, it can make travel safer, healthier, and more responsible by reducing spread on planes, in airports and at destinations.” The CDC said travelers must get a viral test within three days before their flight to the U.S., which will likely send some vacationers scrambling to find locations during their trip. Passengers will have to show proof of a negative test to their airline before boarding. If a passenger does not provide documentation of a negative test or recovery from COVID-19, or chooses not to take a test, the airline must deny boarding, the CDC says. The number of passengers arriving in the United States on international flights has surged since June as travel has rebounded despite the continuing pandemic, according to Martin Cetron, the director of the CDC's Division of Global Migration and Quarantine. There were 2.1 million arrivals between Dec. 1 and Dec. 28, he said, an average of 76,000 passengers a day and quadruple the number of passengers in June. "There's been this resurgence,'' he said in an interview with USA TODAY before the testing requirement was announced. For months, airlines have been pushing for a testing program to restart badly depressed international travelespecially critical business travel. Airlines bank on business travelers because they buy pricey last-minute tickets and travel frequently. It is a responsible performance to prove that the COVID-19 test is negative before boarding, otherwise the infected person is like a time bomb.