A parasitic infection caused by pinworms (threadworms), causing itching especially around the rectum.
From 'Enterobius' (genus of pinworms) + '-iasis' (disease condition). The genus name combines 'entero-' (intestine) + Greek 'bios' (life).
Pinworms are the most common parasitic infection in developed countries, especially in children—they're not dangerous but incredibly annoying, and the fact that they're so common shows how difficult it is to escape parasites entirely.
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