Thousands of people are stuck on a cruise ship docked in Japan under quarantine while medical officials test guests for coronavirus.

An 80-year-old guest from Hong Kong was diagnosed with coronavirus after disembarking the ship on Jan. 25, five days after it departed from Yokohama, Japan, according to a statement from the cruise line obtained by CNN.

The man, who has not been identified, was hospitalized on Jan. 30 and is currently in stable condition.

After his diagnosis, the cruise, the Diamond Princess, has been quarantined in Yokohama, including all 2,666 guests and 1,045 crew members.

It’s unclear if any of the other guests have reported symptoms and the cruise line did not immediately return a request for comment.

Passengers are expected to be held on the ship until at least Tuesday night.

As of Tuesday, more than 20,000 people have been infected with coronavirus and 427 people killed, almost exclusively in mainland China.

The United States has banned anyone who visited China within the last 14 days, a move blasted by the Chinese government Monday.

“It is precisely developed countries like the United States with strong epidemic prevention capabilities and facilities that have taken the lead in imposing excessive restrictions contrary to WHO recommendations,” Chinese foreign ministry spokeswoman Hua Chunying said, accusing the administration of helping to “create and spread fear.”

Last week, almost 6,000 people were quarantined on a cruise ship in Italy while two Chinese passengers were tested for coronavirus, but the tests were negative.

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