I am the same way, something always happens on right before or on vacation. Our DD14 seems to always catch the vomitting virus on vacation, no matter where we are, on the cruise, DC or WDW. DS9 always gets diarrhea or colds. They will be fine, then get hit in the middle of the trip, so I carry the medicine cabinet with me with everything that you could imagine for any possible scenario. We are leaving on Jan 11, so I am taking extra precautions at Christmas, my nephew is a walking virus and the ILs are less than forthcoming in tellling us. Last Christmas, we came into the house and after being at MIL's for 2 hours, they informed us that he had been to urgent care in the am because he was running a fever of 104 and had been diagnosed with strep throat. This info was presented after he proceed to cough all over the dinner table and DS's present, then she thought that we may want to have DS wash his hands, what??? And yes, this was year 3 of the virus spreading holiday. So, yes, this year I am a little paranoid before our cruise.