No where did it say everyone needed a YF shot. I believe some people incorrectly interpreted it this way. Here is what the letter says. Please post if you have a different one. Perhaps they sent one out I didn't get.
IMPORTANT HEALTH INFORMATION
Dear Valued Guests and Travel Advisors,
As the health and welfare of our guests and crew is paramount, we would like to remind you of the following health requirements for your upcoming voyage. Your itinerary may include ports in one or more countries of the areas listed below.
Yellow Fever Inoculation and Malaria Prophylaxis:
NORTH AMERICA (ST. LUCIA*)
*Note Colombia, India and St. Lucia require proof of inoculation or a physician’s letter if guests are arriving from an endemic area.
We encourage concerned guests to use this Health Notice as a reminder to consult the Centers for Disease Control and Prevention site and more importantly, their physician to make the best decision based on their overall health.
The Centers for Disease Control and Prevention (CDC) website is: http://wwwnc.cdc.gov/travel IMPORTANT NOTICE REGARDING THE YELLOW FEVER VACCINE YF-Vax, the only yellow fever vaccine licensed in the United States, is currently out of stock. Until YF-Vax becomes available Stamaril, an alternate vaccine created by Sanofi Pasteur with the assistance of both the Centers for Disease Control and Prevention (CDC) and Food and Drug Administration (FDA).
Guests able and planning to obtain the vaccine: kindly arrive onboard already vaccinated and have your signed and stamped International Certificate of Vaccination or Prophylaxis (ICVP, sometimes called the “yellow card”) with you should proof be required.
For a list of locations where Stamaril is currently available in the United States click on the following link: https://wwwnc.cdc.gov/travel/page/search-for-stamaril-clinics
Our vessels will have limited amounts of Stamaril in case of emergency.
Oceania Cruises does not require proof of inoculation, nor will deny guests embarkation.
Please note however, the countries the vessel calls to or the port agent(s) at the pier may require proof of vaccination(s) prior to allowing a guest to go ashore.
For guests unable to take the vaccine(s) listed as required by the CDC, please bring a letter from your physician to turn in should it be requested.