TRAVIS AIR FORCE BASE, Calif.  — More than 300 American cruise ship passengers, including 14 who tested positive for coronavirus, were being quarantined at military bases in California and Texas on Monday after arriving from Japan on charter flights overnight.

One plane carrying cruise passengers touched down at Travis Air Force Base in Northern California just before midnight Sunday, while another arrived at Lackland Air Force Base in Texas early Monday. The passengers will remain at the bases for two weeks.

Japan’s Defense Minister Taro Kono tweeted earlier that Japanese troops helped transport 340 U.S. passengers on 14 buses from Yokohama port to Tokyo’s Haneda airport. About 380 Americans were on the cruise ship.

The U.S. said it arranged for the evacuation because people on the Diamond Princess were at a high risk of exposure to the new virus that’s been spreading in Asia. For the departing Americans, the evacuation cuts short a 14-day quarantine that began aboard the cruise ship Feb. 5.

The State Department announced later that 14 of the evacuees received confirmation they had the virus but were allowed to board the flight because they had no symptoms. They were being kept isolated from other passengers on the flight, the U.S. State and Health and Human Services said in a joint statement.

Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases at the National Institutes of Health, said Sunday that an infected person who shows minimal symptoms could still pass the virus to someone else.

It’s unclear which base the 14 who tested positive for the virus went to.

Officials said the evacuees who arrived at Travis Air Force Base will be housed at a different location from the more than 200 other Americans who were already being quarantined on the base, in a hotel. Those people have been at the base since early February, when they arrived on flights from China.

No Travis airmen will have contact with the passengers, officials said.

Now that they’re in the U.S., the cruise ship passengers must go through another 14 days of quarantine at the military facilities — meaning they will have been under quarantine for a total of nearly four weeks.

Australia, Canada, Hong Kong and Italy were planning similar flights of passengers. Other governments, including Canada and Hong Kong, also will require the passengers to undergo a second 14-day quarantine.

Japan on Monday announced another 99 infections on the Diamond Princess, raising the ship’s total number of cases to 454. Overall, Japan has 419 confirmed cases of the virus, including one death. The United States has confirmed 15 cases within the country. Separately, one U.S. citizen died in China.