I think that many of the tummy troubles are caused, not by food poisoning, but because most people are eating foods they are unaccustomed to, in quantities they are unaccustomed to. How many people usually eat 2-3 meals for many days in a row in a restaurant? I know I don't. Stomachs seem to respond unfavoribly to great changes in dietary consumption. So to blame it on Disney is a bit harsh, blame it on a change in dietary habit.