We are leaving for disney this weekend with preschoolers. Has this crossed my mind-yes. But I have decided to set my anxiety aside and go on vacation. Florida is no more risky than going on the metro here and head to a museum. We can't spend the rest of our life in a bubble, so we will do as pp said - wash our hands, I purchased antibacterial hand stuff for the first time and going to meet mickey.
Have fun!