Members of the Japan Self-Defense Forces attach a military vehicle to a gate of the Diamond Princess cruise ship. Behrouz Mehri/AFP/Getty Images

Another 44 people have tested positive for the novel coronavirus aboard the Diamond Princess cruise ship docked in Yokohama, Japanese health minister Katsunobu Kato said on Thursday.

This bring the total number of cases on the ship to 219, including one Japanese quarantine officer -- the largest outbreak of the virus outside of mainland China.

Kato did not give a breakdown by nationality of the new cases, nor of passengers versus crew.

Floating quarantine: More than 3,700 passengers and crew are stuck on the cruise ship in Yokohama that became a floating quarantine zone after dozens of people tested positive for the novel coronavirus earlier this month.

The number of infections is increasing by the day. On Wednesday, Kato announced 40 new cases among those on board.

CNN’s latest tally indicates that at least 24 Americans have tested positive.

Some respite: The health minister also said that people who have tested negative for the virus and are over 80 years old, or have a non-virus medical condition requiring attention, will be allowed to leave the ship and move to a government medical facility, if they wish. He did not give a timeline for that process.

An unknown number of passengers with non-virus medical conditions were allowed to disembark earlier on Tuesday.