Tokyo (CNN) At least 24 Americans are among the 135 people infected with coronavirus aboard the Diamond Princess cruise ship in Yokohama, Princess Cruises said Monday, explaining it is using numbers from Japan's Health Ministry.

Princess has not released the nationalities for six patients who the cruise line said were added to the overall tally Sunday.

A growing number of people face 14-day quarantines as health officials around the world try to stem the tide of the outbreak, which has killed more than 900 people and infected more than 40,000 worldwide.

More than 3,000 people -- including 428 Americans -- are stuck on the cruise ship that became a floating quarantine zone after dozens of people tested positive for coronavirus.

Spencer Fehrenbacher is under quarantine on a cruise ship in Yokohama, Japan.

Among them is Spencer Fehrenbacher, an American citizen and masters degree student in Tianjin, China, who wanted to celebrate Chinese New Year with his friends on the ship.

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