The following can help prevent the spread of pinworm: Washing the hands with soap and warm water after using the toilet, after changing diapers, and before handling food (the most successful way) Frequently washing clothing, bedding, and toys If people are infected, showering every morning to help remove eggs on the skin Vacuuming the environment to try to eliminate eggs Avoidance of oral-anal contact during sex Key Points Pinworm infestation is the most common helminthic infection in the United States; most cases occur in school-aged or younger children, in adults who care for children, or in family members of an infected child.