Nearly 120 passengers and crew members became sick with a stomach virus aboard a ship that returned to port Saturday after a five-day Caribbean cruise, Royal Caribbean International officials said. The outbreak of a Norwalk-type virus aboard the Enchantment of the Seas sickened 108 passengers and eight crew members, said company spokesman Michael Sheehan. It was traced to a man who had symptoms two days before boarding the ship Monday, he said. A special cleaning of the 1,950-passenger ship was expected to delay a scheduled departure Saturday for a few hours, officials said. Symptoms of Norwalk-like viruses include nausea, vomiting and diarrhea and last up to 48 hours. No special medical treatment is required.