Pinworms (Enterobius vermicularis) are among the most common intestinal parasites in children worldwide. While usually not dangerous, they can cause significant discomfort and stress. The infection, called enterobiasis, spreads easily in homes, daycare centers, and schools.
Pinworm eggs are microscopic, lightweight, and can survive for two to three weeks on surfaces like toys, bedding, clothing, and bathroom fixtures. Children become infected by touching contaminated objects and then putting their hands in their mouths. Eggs under fingernails from scratching the anal area make reinfection common.
Once ingested, eggs hatch in the small intestine, and larvae mature in the large intestine over two to six weeks. Pregnant female worms migrate at night to lay eggs around the anus, causing intense nighttime itching. This can lead to restless sleep, irritability, skin irritation, or, in girls, genital discomfort.
Diagnosis is usually done with the Graham tape test, pressing adhesive tape to the anal area in the morning to collect eggs. Treatment involves antiparasitic medications such as mebendazole, albendazole, or pyrantel pamoate, usually given in two doses two weeks apart. All household members are often treated to prevent reinfection.
Prevention relies on strict hygiene: frequent handwashing, short clean nails, daily morning bathing, washing bedding and clothing in hot water, and cleaning commonly touched surfaces. With proper treatment and hygiene, pinworm infections are easily controlled and rarely cause lasting problems.
