Although the virus can be airborne, you would most likely have to be right near someone actively vomiting, or be cleaning substantial amounts of contaminated material that aerosolizes and spatters to be infected with Norwalk via airborne contamination. Unless someone you are staying with and taking care of has Norwalk, you are most likely only going to get it by touching something contaminated and putting your fingers in your mouth, or by eating food that was contaminated by someone not washing effectively and touching it before you got to it. Besides Purell, Avon makes some very nicely scented forms of "waterless" soap. Using the hand sanitizers after touching the things everyone touches is of course a great idea. But, don't forget, use the sanatizer AFTER going through the buffet line but BEFORE touching your food or utensils. When you touch the serving items, you may as well have shaken hands with the hundreds of others ahead of you in line. Washing your hands before going into the dining room isn't enough in the case of the buffets.