Ten passengers aboard a cruise ship quarantined in Japan have tested positive for the Wuhan coronavirus.

The Diamond Princess arrived in Yokohama on Monday after a round trip to Hong Kong.

It was quarantined upon arrival in Japan after an 80-year-old man who disembarked on January 25 in Hong Kong later tested positive for the virus, which spreads from human to human.

Medics began examining all 3,711 passengers and crew who remained on the ship on Tuesday, with about 300 specifically screened for the novel coronavirus. It’s not clear why those 300 were singled out.

As of Wednesday, 10 people on board had tested positive for the virus, the Japanese state broadcaster NHK reported, citing the health ministry.

Diamond Princess Japan shuip wuhan coronavirus

Foto: The Diamond Princess in Yokohama.sourceKyodo News/YouTube

The 10 patients, all at least 50 years old, consist of two Australians, three Japanese, three Hong Kongers, one American, and one Filipino, the cruise operator Princess Cruises said in a press release.

The Japanese Coast Guard has taken them all to an isolation clinic at a nearby hospital on the Japanese mainland, NHK reported.

Including those 10 people, 120 people aboard the ship showed symptoms of the virus during initial checks, NHK said. Symptoms include fevers and coughing.

One hundred fifty-three other people were tested because they had come into close contact with those showing symptoms.

Authorities have quarantined the ship for the next 14 days, Japan's health ministry said, according to NHK. That means nobody can leave it for the next two weeks.

Princess Cruises says it has given guests free WiFi and telephones to stay in touch with their families. It's not clear whether other activities are still available. Reuters reported on Tuesday that the casino, shops, and photo studio had been shut, and photos shared by a passenger on board showed the rooftop pool deserted.

A man in a proctective clothing is seen on the sixth deck of cruise ship Diamond Princess in Yokohama, in this February 4, 2020 photo obtained from social media.  Twitter / @DAXA_TW via REUTERS

Foto: A man in protective clothing seen on the sixth deck of the cruise ship Diamond Princess in Yokohama during medical inspections.sourceReuters

Last week Italian authorities quarantined a cruise ship carrying more than 6,000 people at a port in Civitavecchia, Italy, amid fears that two passengers had the coronavirus. They were released on January 31.

The coronavirus has hit the travel industry hard, as multiple airlines have canceled flights to mainland China and countries have advised against visiting the country. Shares of airlines, hotels, and cruise lines have been trading lower since the outbreak began.

The coronavirus has killed 492 people and infected more than 23,000 others across 26 countries since it broke out in the Chinese city of Wuhan in early December. The vast majority of confirmed cases are in China.