"Most" stomach virus's are fecal-oral in nature. A well person touches an object (doorknob, serving spoon at a buffet, handrail or any other object that is handled by other people and is contaminated with a sick persons virus) and then the virus enters their body, usually by that person touching something to eat or wiping their nose/eyes and then the virus enters the body. I believe that the majority of the time it is caused by eating something with contaminated hands. We wash our hands frequently at WDW and especially before we eat and NEVER touch the bathroom doorknob on the way out of the bathroom after we have just washed our hands. We also turn the water faucets off with a paper towels or the back of our hands. Think about it, if you turned on the water faucet with contaminated hands, washed your hands and then touched the dirty faucets, you are re-contaminating your hands.