Instead, her cruise ship, the Carnival Freedom, passed her destination on Wednesday after a port refused the boat due to coronavirus infections. At least four voyages on Royal Caribbean, Holland America, Carnival and others this week have been altered by coronavirus outbreaks as cruise lines prepared to pre-pandemic levels before voyages were suspended. Although ships resuming their cruise have tightened coronavirus precautions requiring vaccinations and testing of passengers, the wave of new infections fueled by the fast-multiplying omicron variant has knocked on the destroyed industry and alerted cruisers.