Body Louse (Nit/Egg case)

Scientific Name: Pediculus humanus humanus

Order & Family: Phthiraptera: Pediculidae

Size: Nits/Eggs: approx. 0.8 mm; Adults: 2-4 mm long

Body Louse (Nit/Egg case)

Natural Habitat

Typically found on human clothing, particularly along seams, rather than directly on the skin or hair (unlike head lice). They move to the skin only to feed.

Diet & Feeding

Hematophagous; they feed exclusively on human blood.

Behavior Patterns

Body lice lay their eggs (nits) in the seams of clothing or on bedding. They thrive in crowded, unsanitary conditions where clothing is rarely washed or changed. They are parasitic and require repeated blood meals.

Risks & Benefits

Risks: Causes intense itching (pruritus) and skin discoloration ('vagabond's disease'). More seriously, they are vectors for diseases like typhus, trench fever, and relapsing fever. Benefits: None known to humans or general ecosystem.

Identified on: 3/9/2026