"In updated guidance for travelers, the CDC still says it’s best to “avoid” cruise travel and encourages people to be fully vaccinated and boosted against COVID-19 before boarding a cruise ship.
Under the voluntary program, there are three vaccination status levels:
“Not highly vaccinated” ships, with less than 95% of passengers and crew fully vaccinated
"Highly vaccinated” ships, with at least 95% of passengers and crew fully vaccinated but less than 95% with up-to-date vaccines, including boosters
“Vaccination standard of excellence” ships, with 95% of passengers and crew fully vaccinated and boosted
The new program still requires passengers to have a COVID-19 test before embarking. Cruise lines that take part must follow all the new recommendations and notify the CDC of the vaccination status classification for each ship."
https://www.webmd.com/lung/news/20220211/cdc-voluntary-rules-for-cruises
