I was so worried that my kids would get sick right before our trip in July that I didn't let them go over their cousin's house to play that weekend before just in case they might catch something. Well, 3 days into our trip, my DD4 came down with a little stomach bug. Thank goodness it only lasted half a day and by next morning (our character breakfast) she was fine. But, on the morning of our departure day, my DD8 and I both felt queasy in the morning and on the 20-hour drive home to NJ, my DD7 ended up with the stomach bug and actually got sick in the car somewhere in South Carolina at 3:00am. Anyway, my point is, that despite being sick, we still had a wonderful time! So, don't worry too much about it - being sick in WDW is still better than not being sick at home!