The Royal Caribbean 's Grandeur of the Seas was sick during back - to - back cruises ending Saturday . That wo n't stop it from setting off again for a third time . Norovirus is a common cause of diarrhea and vomiting among cruise ship passengers . It causes as many as 100 U.S. deaths per year , CDC says .
The Royal Caribbean 's Grandeur of the Seas was struck during back-to-back cruises ending Saturday . That wo n't stop it from setting off Saturday for a third cruise . Norovirus is a common cause of diarrhea and vomiting among cruise ship passengers . It causes as many as 800 U.S. deaths per year , CDC says .