Two hundred and seventy-seven passengers and crew members Oasis of the Seas by Royal Caribbean They suffered a gastrointestinal disease, said the cruise line.
Due to the illness, the ship will return to Port Canaveral, Florida, on Saturday, a day earlier than expected.
"All guests will receive a full refund of the fare paid for the cruise," said Owen Torres, a spokeswoman for Royal Caribbean. "We believe the right thing to do is to get everyone home rather than having guests concerned about their health."
The cruise embarked on a seven-night trip on Sunday. His itinerary shows stops in Haiti, Jamaica and Mexico.
Cody Haddap, a passenger, spoke to the CNN WESH branch on Wednesday and said that He became ill after the ship left Haiti on Tuesday.
"Yesterday we left the port around 4 o'clock and last night, around 10 o'clock, we started getting sick. We were locked in our rooms."
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Haddap shared a letter from the cruise line he received on Wednesday in his cabin: "During that navigation, there was a small percentage of passengers who experienced gastrointestinal diseases, which are believed to be a norovirus."
Royal Caribbean officials say they expected lab results to determine whether it is a norovirus, the most common cause of acute gastroenteritis in the United States.
By 2018, 11 outbreaks of gastrointestinal diseases were detected on cruise ships and it was determined that 5 were noroviruses. The latest outbreak on a Royal Caribbean ship was in 2017, on the Independence of the Seas cruise, according to the Centers for Disease Control and Prevention (CDC).
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Haddap said that when they arrived in Jamaica the next day, no one was allowed to leave the ship.
O Oasis of the Seas is one of the newest boats in the Royal Caribbean fleet. and can carry more than 8,000 people; approximately 3% of the people aboard the ship got sick.
Royal Caribbean plans to disinfect the ship in time for the next trip. "Our guests travel with us to enjoy great vacations, and we regret that this cruise has been short," Torres said.
Tina Burnside of CNN contributed to this report.