Careful food preparation is necessary to avoid contamination. Unpeeled fruits and vegetables that are going to be eaten raw or lightly cooked must be washed with soap and water, soaked with chlorine or iodine solution in boiled, then cooled, water for 20 minutes, then rinsed again, with water purified by the same technique. All meat should be cooked thoroughly.
It is imperative that you instruct all who prepare meals in your home in proper personal habits, food preparation and handling, as well as dishwashing. This should be done to insure that contaminants are not passed on through hands, dishes, or utensils.