Pinworm (Enterobius vermicularis) infections are the foremost common worm infection in America. Though any one could develop a case of pinworms, the infection happens most often in class kids between five to ten years more matured. Threadworm infections occur altogether socioeconomic groups; but, human-to-human unfold is favored by shut, packed living conditions. Spreading among family members is common. Animals don't harbor pinworms - humans area unit the sole natural host for this parasite. The most common symptom of pinworms is is an itchy rectal area. Symptoms area unit worse in the dark once the feminine worms area unit most active and crawl out of the asshole to deposit their eggs. Though threadworm infections are annoying, they seldom cause serious health issues and area unit typically not dangerous. Medical aid with routine prescription medications provides a good cure in the majority cases.