Carnival is currently sticking with the CDC guidance of sailing with 95 percent of passengers vaccinated. However, the line will provide vaccine exemptions to children under 12 and adults who are not able to receive the vaccine to fill 5 percent of available berths. On cruises out of Long Beach and select fall sailings, Carnival will extend vaccine exemptions to travelers with religious beliefs that prevent them from getting vaccinated.
Unvaccinated passengers who wish to sail will need to be pre-approved during the booking process. The exemptions are not guaranteed and are capacity controlled. These guests will be required to follow specific health protocols and testing requirements, including providing a negative PCR test result at the port, taking an additional antigen test at embarkation and again 24 hours before the cruise ends, and only going ashore in controlled-environment "bubble" tours.
Cruisers departing from Florida and Texas who are not vaccinated must purchase travel insurance for their sailing. Unvaccinated guests sailing from those states, as well as Maryland and Louisiana, who cannot be vaccinated due to health reasons must provide a doctor's note confirming the medical exemption.
These policies will be in place until further notice.
https://cruise.blog/2021/09/cruise-lines-dont-require-covid-vaccines