An outbreak of an unknown illness with primary symptoms of diarrhea, vomiting has stricken 89 of 2,164 passengers as well as 2 of 910 crew on board the Radiance of the Seas, according to a report on the CDC’s Vessel Sanitation Program website.

More than 90 passengers and crew members on a Royal Caribbean International cruise ship which set sail from Tampa, Florida, on Feb. 1 for a weeklong cruise came down with a gastrointestinal illness, causing vomiting and diarrhea.