Carnival has dropped the COVID vaccine and testing requirement for most cruises of 15 nights or less.

For cruises of 16 nights or more, guests aged 18+ must be vaccinated, and boosted if their last dose was more than six months earlier. They must also take a supervised PCR or antigen test up to three days before sailing.

Unvaccinated guests on cruises of 16 nights or more will need to apply for a vaccine exemption for 2023 cruises, if they qualify.

The cruise line is also warning that unvaccinated guests will face restrictions in some destinations, including Grand Turk and Cartagena, Colombia, where unvaccinated adults won’t be allowed to disembark, and Bermuda, where they will need to present proof of travel insurance at check in with cover for medical emergencies and no COVID exclusions.

Different rules apply for cruises from Australia, where all guests over 11 are required to have had at least two doses of a COVID vaccine and those from the age of two must provide a negative COVID test.