Passengers and crew showing symptoms were tested, and more tests will be conducted if symptoms arise in other people on the ship.
Almost 3700 passengers and crew have been largely confined to their cabins for the past 72 hours, with operator Princess Cruises allowing small groups to go on the upper deck for fresh air.
Passengers are under strict orders from Japan’s health authority to constantly wear masks and stay at least one metre away from the nearest person when outside their cabin.
Meals have been delayed by many hours and some passengers are still waiting on prescription medication, as the crew on board tries to manage an unprecedented situation.
The 236 Australians stuck on board the ship are unsure if the mandatory 14-day quarantine period will be extended as more cases of the virus are discovered.
Home Affairs Minister Peter Dutton ruled out an evacuation mission for the stranded Australians.
“The Japanese authorities, they have an advanced health system and they are dealing with what’s a very difficult situation,” Mr Dutton said.
On Friday, Japanese Prime Minister Shinzo Abe made the decision to deny another cruise ship entry to Yokohama, after reports of a passenger showing symptoms of coronavirus.
The Westerdam had made a stop in Hong Kong and was due to dock in Yokohama on Saturday.
This ship’s owner, Holland America, is looking for another port to conclude the journey. The company has also cancelled its next cruise from Yokohama due to leave on February 15.