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Pinworms are spread when an infected person, most often a child, has scratched his/her bare anal area and the eggs get under his/her fingernails. Pinworms can then be spread in the following ways: 1  By an infected child not washing hands after using the bathroom. 2  If the child then touches playmates or toys, he/she may pass on the eggs. 3  Pinworm eggs can also be transferred to the fingers from clothing or bedding, and then spread around the home.
1 Although any individual may develop a case of pinworms, the infection occurs most frequently in school children between 5 to 10 years of age.  Pinworm infections occur in all socioeconomic groups; however, human-to-human spread is favored by close, crowded living conditions. Spread among family members is common.