Pinworms.
The pinworm is one of the most common intestinal parasites in humans. The adult worms reside and mate in the area of the cecum and ascending colon. The females migrate to lay their ova in the perianal area. Perianal itching is the cardinal symptom of pinworm infestation. Collection of pinworms or ova from the perianal area permits diagnosis. Meticulous personal hygiene is essential to prevent spread of the parasites.
D000328:Adult; D000818:Animals; D002648:Child; D004757:Enterobius / Q000033:anatomy & histology / Q000502:physiology; D006801:Humans; D010123:Oxyuriasis / Q000469:parasitology*