When we go to DW, I start my family on a daily regimen of Airborne a few days before we leave (we fly). I bring enough for each of us to continue it every day of the trip, and keep taking it a few days after we get home. I bring bleach wipes to wipe the room down after check in. I also bring meds for symptoms with me - ibuprofen, sudafed, cough syrup, nasal spray, mentholatum, heating pad, cough drops, crystallized ginger (nausea), imodium, and a couple types of tea bags. I rarely need this stuff. When we were in DW in Dec. half the people in the parks were coughing - everywhere. Not typical, mind you, but it can happen. Well, we got sick, too. We stayed in our room for a day, took our meds, slept, drank tea and water, and moved on with our lives. Except for my youngest (ds 22), he needed more - our front desk called us a van from Centra Care. Only took a few hours, got his meds filled, had him back to our resort and resting. He needed an extra day of rest, but then he was good to go as well. Just have a contingency plan, take meds with you, get the flu shot, and enjoy. You can deal with anything that pops up, and Disney is fabulous in a crisis. You'll be fine, and remember what Edna Mode says, "luck favors the prepared".