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Norovirus outbreaks on cruise ships are not as common as we perceive, but it’s still important to understand norovirus infection complications along with incubation periods. The Centers for Disease Control and Prevention (CDC) stated, cruise ship vessels that are part of the Vessel Sanitation Program (VSP) are required to report gastrointestinal illnesses, which occur on the ship, as reported by medical personnel, up to 24 hours prior to docking in the U.S. when coming from a foreign destination. These reports must be submitted even if no cases are reported. Furthermore, if cases exceed two percent, a separate notification must be given.
An outbreak update from a cruise ship occurs when a ship is sailing between three to 21 days, is carrying over 100 persons, has three percent or more of passengers reporting diarrhea or symptoms of diarrhea, and if the outbreak is of public health significance.