The initial question is whether you are "Fully Vaccinated" or "Up to Date" according to Celebrity's definitions:   *European definition of Up to Date: vaccinated within 9 months (270 days) of final dose in primary series OR boosted. The 270 days must extend to the final day of the cruise. The last primary dose must have been administered at least 14 days prior to embarkation. **Definition of Fully Vaccinated:  vaccinated with a full dose of a primary series vaccine more than 9 mon