Pinworm

Scientific Name: Enterobius vermicularis

Order & Family: Order: Rhabditida, Family: Oxyuridae

Size: 2 to 13 millimeters (females are larger than males)

Human large intestine and rectum, occasionally found in feces or near the perianal skin

Intestinal contents and organic matter within the human digestive tract

Active mainly at night when females migrate to the perianal area to lay eggs, causing intense itching

Causes enterobiasis, leading to itching and sleep disturbance; no ecosystem benefits, posing a transmission risk via contaminated surfaces

Identified on: 2/19/2026