My family always gets sick after a cruise. On the 4 we've been on (2 on Disney) when we get off we all have colds, fever, yucky feeling. It's a product of your environment (closed circuit air conditioning, close quarters, blah, blah, blah) At least one of my four has something on CC or it starts that night. What I'm trying to say -- don't panic! You don't panic when it goes through school, office, etc. You are also eating richer foods than normal and more than normal, being in the sun more than normal, not sleeping as much, yadda yadda yadda. Wash your hands, take hand sanitizer and have a great time!