Pinworm (Threadworm)

Natural Habitat

The primary habitat is the human gastrointestinal tract, specifically the large intestine and rectum. Eggs can survive on surfaces like bedding, clothing, and furniture for up to 2-3 weeks.

Diet & Feeding

Parasitic; they feed on matter within the human intestine.

Behavior Patterns

Nocturnal behavior is key; female worms migrate out of the anus at night to deposit thousands of eggs on the perianal skin, causing intense itching. This itching facilitates transmission via scratching and subsequent surface contamination.

Risks & Benefits

Risks: Highly contagious human parasite causing Enterobiasis. Symptoms include severe itching, poor sleep, and restlessness. While generally not dangerous, severe infestations can cause discomfort and secondary skin infections. Benefits: None.

Identified on: 2/10/2026