Pinworm (Egg and Larval stages)
Scientific Name: Enterobius vermicularis
Order & Family: Order: Oxyurida, Family: Oxyuridae
Size: Eggs are 50 to 60 micrometers; adult females range from 8 to 13 mm in length.
Natural Habitat
The human large intestine and rectum; eggs are typically found in the perianal region or on environmental surfaces like bedding and clothing.
Diet & Feeding
Absorbs nutrients from intestinal contents and epithelial cells within the human host.
Behavior Patterns
Adult females migrate out of the anus at night to deposit eggs on the skin, which causes intense itching. Eggs become infectious within a few hours and are typically spread via the fecal-oral route.
Risks & Benefits
Causes enterobiasis, characterized by perianal itching and restless sleep. While not considered dangerous, it is highly contagious within households or childcare settings and requires medicinal treatment.
Identified on: 2/13/2026