Pinworm

Natural Habitat

The human large intestine (specifically the cecum and appendix); eggs are found in the perianal area and contaminated environments.

Diet & Feeding

Intestinal contents, bacteria, and epithelial cells within the human digestive tract.

Behavior Patterns

Nocturnal migration where gravid females move to the perianal region to deposit eggs, causing itching. Eggs become infectious within hours and are spread via the fecal-oral route.

Risks & Benefits

Causes enterobiasis, characterized by intense anal itching and restless sleep. While generally not dangerous, it is highly contagious and requires medical treatment (anthelmintics) for the patient and household.

Identified on: 3/26/2026