Pinworm

Natural Habitat

The human large intestine, particularly the cecum and appendix; eggs are found in soil, dust, or on contaminated surfaces and fabrics.

Diet & Feeding

Feeds on intestinal contents and mucosal secretions within the human host.

Behavior Patterns

Nocturnal migration where female worms travel to the anal area to deposit thousands of eggs; eggs become infectious within hours and cause intense itching (pruritus ani).

Risks & Benefits

Risk: Causes enterobiasis, an intestinal infection characterized by itching and sleep disturbance; highly contagious among household members. Benefit: None.

Identified on: 12/30/2025