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.

More than 140 people aboard Royal Caribbean's Navigator of the Seas suddenly got sick with vomiting and diarrhea during a round-trip cruise from Los Angeles to Mexico. The outbreak affected 134 passengers and seven crew members after the ship departed from LA on July 4.