A norovirus outbreak has been reported on a cruise ship, with more than 200 passengers sickened. Here's what to know about the

More than 240 people on board the luxury Queen Mary 2 cruise ship have fallen ill with the highly contagious norovirus stomach bug. The US Centers for Disease Control and Protection (CDC) reported the outbreak just as the Cunard cruise liner was nearing the end of a four-week-long return voyage from the UK to the Caribbean.

According to the Vessel Sanitation Program (VSP), 224 passengers and 17 crew members became ill during the cruise, with the ship carrying a total of 2,538 passengers and 1,232 crew. The primary symptoms reported, diarrhea and vomiting, were consistent with norovirus, which was identified as the cause.