Community identification
Pubic Louse (Crab Louse)
Pthirus pubis
- Order & Family
- Order: Psocodea, Family: Pthiridae
- Size
- 1.1 to 1.8 mm (about the size of a pinhead).
Natural Habitat
Human pubic hair, occasionally other coarse body hair (eyelashes, eyebrows, facial hair, chest hair).
Diet & Feeding
Obligate blood feeders, obtaining blood meals directly from human hosts.
Behavior Patterns
They are stationary and attach themselves to the base of hair shafts. Eggs (nits) are glued to the hair. The life cycle from egg to adult takes about 3 to 4 weeks.
Risks & Benefits
Causes intense pruritus (itching) and pediculosis pubis. Can lead to secondary bacterial infections from scratching. Transmitted mainly through sexual contact.