It follows a recent unknown outbreak with similar symptoms that afflicted the Royal Caribbean Radiance of the Seas sailing out of Tampa.

Cruise ships are required to report these outbreaks, the CDC said. The Rotterdam, a Holland America Line cruise ship, reported theirs on Feb. 7. This is the fourth outbreak reported to the agency this year.

A norovirus outbreak on a nearly two-week-long Holland America cruise ship sickened 152 passengers and more than a dozen crew members with symptoms like vomiting and diarrhea, health officials said. Just under 6% of the 2,