Mixed Vaccines from Different Manufacturers
We understand some guests may have been vaccinated with doses from two different vaccine manufacturers. Whether these are accepted depends on the mix of manufacturers and where you are sailing from.
For Cruises Departing from U.S. Ports
The U.S. CDC advises that a vaccine series should be completed with products from the same manufacturer, as the safety of a mixed-product series has not been fully evaluated. However, Royal Caribbean will accommodate guests who are vaccinated with mixed mRNA vaccines, such as 1 shot of Pfizer and 1 shot of Moderna. The doses must be separated by at least 28 days and not more than 42 days.
We do not accept 1 shot of an mRNA vaccine (e.g., Pfizer or Moderna) mixed with 1 shot of a viral vector vaccine (e.g., AstraZeneca).
Mixed vaccines may not be accepted at all ports of call. Guests who are vaccinated with a mixed series may need to undergo additional testing at embarkation if they wish to go ashore in these ports.
What vaccines are accepted?
Royal Caribbean accepts vaccines that are fully approved or authorized for emergency use by the U.S. FDA or the World Health Organization. All doses of your vaccine should be from the same manufacturer and of the same type (e.g. mRNA), in the required number of doses to be considered fully administered (e.g. 2 shots of Pfizer, Moderna, AstraZeneca, etc., or 1 shot of Johnson & Johnson). A guest is considered fully vaccinated 14 days after their vaccine series is completed.
I don't see any mention of a timeline if you got the same vaccine shot. Seems the 28-42 days timeline is only mentioned for mixing vaccines.