As travelers seek to visit their favorite destinations once again, we have updated our health and safety protocols for U.S. residents sailing from U.S. ports to the Caribbean and The Bahamas. Vaccination is recommended but no longer required and pre-cruise testing is recommended but not required for fully vaccinated guests. Unvaccinated guests are required to show proof of a negative COVID-19 viral test (NAAT or antigen) taken within 3 days of embarkation. Requirements for non-U.S. residents remain unchanged.
https://www.msccruisesusa.com/health-and-safety-measures/caribbean-cruises