Always Bring A First Aid Kit With You
The closed-off nature of the environment of a cruise ship makes it ideal for any kind of disease to quickly spread. This is why crew members are trained to keep the ship and themselves as clean and healthy as possible. If a crew is sick, he or she is usually isolated to prevent the illness from spreading to anyone else.
Having your own first-aid kit ups your chances of not contracting the disease in the event that it does manage to spread to other passengers.