Interesting. But, IMO, essentially useless lip service the cruise lines are proposing in a desperate attempt to appease the various government entities that want to cease cruise ship operations for the time being.
I seriously doubt you’ll find a physician to write a letter testifying to the fitness of a 70+ year old person to take a cruise when the State Department and CDC are saying “Avoid cruising” to this same demographic. Who is going to risk that kind of liability? A physician might think the person is fit to cruise, but they aren’t going to put it in writing and have an official trail of bad advice for Granny’s heirs to use in the malpractice lawsuit.
But that doesn’t matter because people without pre-existing conditions and those under 70 can still get coronavirus and still spread it all over port cities....