How vaccines work: (my understanding)
1. Vaccines do not prevent incursion of virus into your body.
Because vaccines do not form a steel shield around your
body. So vaccinated person CAN get infected if exposed to a load of virus.
2. What the vaccine attempts to do is create anti-bodies for the virus in your system. So when the virus invades, your body is better prepared to fight it. Most likely you will be asymptomatic. You won’t even know you are infected unless some special tests are done.
3. The amount of virus exuded by an infected person depends on the severity of symptoms. If you are coughing up a storm due to the virus making camp in your lungs, you are going to expel more virus material than if you are asymptomatic without a cough. This is such basic common sense, it does not require links to CDC to confirm.
4. If ship has 95%+ vaccinated passengers, there will not be a large number of people getting fevers and cough and thus spreading lot of virus material to others.
3.
In my opinion the ship will be a giant test tube. Only time will tell how this works out for them.