Ten passengers on a Japanese cruise carrying 3,711 people tested positive for novel coronavirus, the Japanese health minister said on Wednesday.

The Diamond Princess cruise ship has been kept in quarantine off the coast of Yokohama since an 80-year-old passenger from Hong Kong was discovered to have contracted the coronavirus.

273 people who had close contact with the passenger were tested, and 31 results had come back. All 10 confirmed patients were being sent to medical organizations, said the health minister.

As of Wednesday morning, there have been 30 confirmed novel coronavirus cases in Japan.