Understanding the Life Cycle of a louse is critical to successful treatment.  Here are the basics:

  1. The life cycle of a louse is 30 days. A female louse is reproductive after approximately 10 days.
  2. A female louse can lay up to 200 eggs in her lifetime (approx. 5 eggs 2x’s per day).  Eggs will hatch 7-10 days after being laid.
  3. A newly hatched louse (nymph) will go through three stages of development within approximately 10 days before it becomes an adult.
  4. Early stage nymphs do not cross over to another human head as they are not fully physically developed yet to do so.
  5. When a louse becomes an adult at 9-10 days of life, it is then reproductive and contagious!

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