The ship, carrying 3,050 passengers, docked in New Jersey last week after 630 passengers and 54 crew members grew ill during a Caribbean cruise. It was one of the largest norovirus outbreaks on a cruise ship in the last 20 years.
The Sydney strain emerged within about the last two years. It's not considered unusually dangerous, but has quickly become a common cause of cases of vomiting and diarrhea that last a few days.
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