Depends on when you sail - different rules for Europe too
For all Celebrity cruises scheduled to sail from the U.S. on or before May 17, 2022, if you test positive for COVID-19 during the voyage:
• Celebrity will cover the cost of necessary COVID-19 related medical treatment onboard the ship;
• you and members of your Traveling Party may stay onboard the ship to complete any required quarantine period, without needing to pay additional cruise fare, stateroom gratuities or taxes/fees to Celebrity for the same. As an alternative, Celebrity will coordinate and cover the costs of any required land-based quarantine for you and members of your Traveling Party;