Gastrointestinal illness sickened more than 130 cruise ship passengers aboard a Royal Caribbean cruise earlier this month. The cause of the outbreak has not been determined.

The U.S. Centers for Disease Control and Prevention has announced that an unknown illness sickened several people aboard a cruise ship earlier this month.

A dream vacation quickly turned into a nightmare for more than 140 people aboard Royal Caribbean’s Navigator of the Seas when a mysterious illness swept through the ship during a week-long cruise.The gastrointestinal outbreak,