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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.
By Mayo Clinic Staff. Accidentally swallowing or breathing in pinworm eggs causes a pinworm infection. The microscopic eggs can be carried to your mouth by contaminated food, drink or your fingers. Once swallowed, the eggs hatch in the intestines and mature into adult worms within a few weeks. Female pinworms move to the anal area to lay their eggs, which often results in anal itching. When you scratch the itchy area, the eggs cling to your fingers and get under your fingernails.