Norovirus outbreaks on cruise ships are relatively uncommon compared with the enormous number of voyages and passengers each year, but they receive outsized attention because they can spread rapidly and can significantly disrupt vacations. According to the U.S. Centers for Disease Control and Prevention (CDC), norovirus outbreaks among cruise passengers account for only about 1 percent of all reported cases, on land or at sea, and affect about 3 to 5 percent of individuals on a given voyage. Norovirus is still the most frequently identified cause of gastrointestinal outbreaks at sea because it is extremely contagious and spreads easily.
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