Just to clear up, it only passes easily from person to person if you don't keep your hands clean. If you wash your hands before you eat and after you use the toilet you should be fine. Try your best to keep your hands away from your mouth where possible and you'll be fine. You can only catch it by ingesting vomit or feces particles which is why cleanliness is important :-) Don't panic, its not as easy to catch as Doug makes out.