infections
Pinworm Infection
Transmission of pinworms
Infection occurs after pinworm eggs (ova) are swallowed. The larvae in the eggs hatch in the small intestine, then move to the large intestine. There, the larvae mature within 2 to 6 weeks, and the adult worms mate. After the eggs develop, the adult female worm moves to the rectum and exits through the anus to lay eggs. The eggs are deposited in a sticky, gelatinous substance that sticks to the skin around the anus. From there, eggs can be transferred to fingernails, clothing, bedding, toys, or food. Eggs can survive outside the body up to 3 weeks at normal room temperature. Eggs are often introduced into the mouth from fingers or from contaminated food. Children may reinfect themselves by transferring eggs from the area around their anus to their mouth. Children who suck their thumbs are at increased risk of infection, as are adults who live with children or who practice oral-anal sex. 