The Centers for Disease Control found 11 of the 13 "older" adults flown to Omaha after quarantine on a cruise ship in Japan have tested positive for COVID-19.

The

upon their

.

According to a release Thursday evening from UNMC/Nebraska Medicine, 10 people are currently under quarantine at the National Quarantine Unit at UNMC, and three are in the Nebraska Biocontainment Unit, the release states.

"Most of our guests aren't showing symptoms of the disease, however, several others are exhibiting minor symptoms," a UNMC spokesman said in the release.

Two people tested negative, the release states. Should they continue to test negative, they could be released as early as Monday, the spokesman said.

All 13 were passengers on

, where they were quarantined for several days near Tokyo before

and

.

Update from Spokane

6 News learned Thursday night that there are four more American passengers now in isolation in Washington state who have tested positive for coronavirus. They had previously been under quarantine at Travis Air Force Base in California.

Health officials in Spokane said the patients with COVID-19 are all U.S. citizens, but it was not immediately clear where they were infected: on the ship or at the air force base.

The patients are being transported to

, one of only 10 in the nation with secure airborne infection isolation rooms.