One of my serious concerns and I'm NOT trying to be political, but if they do develop a vaccine, and it proves effective enough to have every one receive it, what will the folks that don't believe in vaccinations do? If they refuse the vaccine, based on their scientific beliefs, will they be allowed to take a cruise??? I do worry about the vaccine being universally effective, but can everyone take it? Can infants? Elderly with underlying health conditions? Cancer patients? etc... if there's exceptions those are at risk. There's just too many unknowns at this point, I honestly believe that until a working vaccine is discovered, the chances of cruises resuming might not be very good. Just so many questions.
One possibility is that in the future cruising could require proof of vaccination via a "yellow card" (International Certificate of Vaccination or Prophylaxis (ICVP)) as is used for when a yellow fever vaccination is required for travel to certain countries as part of international and country regulations [see https://www.canada.ca/en/public-hea...ation-prophylaxis-poliovirus-vaccination.html]. For those who cannot receive the yellow fever vaccination for medical reasons [ie vaccination for YF is medically contraindicated] it is possible to get a waiver certification. I don't know if all countries that require YF vaccination are required to accept the waiver. If such a situation were the case, medical waivers may be the only waiver available, if it was an option at all.
SW