Where do female pediculus humanus capitis (head lice) lay eggs in pediculosis and pthiriasis (lice infestation)?

Updated: Mar 01, 2018
  • Author: Lyn C C Guenther, MD, FRCPC, FAAD; Chief Editor: Michael Stuart Bronze, MD  more...
  • Print
Answer

The adult female louse lays eggs, called nits, and glues them at the base of the hair shaft. Nits are placed within 1-2 mm of the scalp, where the temperature is optimal for incubation. The female head louse lays as many as 10 eggs per 24 hours, usually at night. Egg and glue extrusion onto the hair shaft takes 16 seconds. Nits are typically located at the posterior hairline and postauricular areas. [4]


Did this answer your question?
Additional feedback? (Optional)
Thank you for your feedback!