My agent received the following reply from Viking when they asked if a yellow fever vaccination was needed for Jamaica after we had visited Panama
Thank you for your email.
As the guests are over 60, they can obtain an exemption letter for the yellow fever vaccination.
If the guests require the yellow fever vaccination, we will of course notify the guests via your agency closer to the time of departure, however, currently we have not received any notification from our operations team that guests on this sailing require the yellow fever vaccination.
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So wait and see