life cycle of head lice. The life cycle of the human head louse is 30 days. Lice reproduce more rapidly in warm weather, thus higher rates of head lice are seen in New England during the spring, summer and fall seasons. Because lice have the ability to lay hundreds of eggs on the hair shaft, a head lice case can ramp up within 2 months to a full blown infestation. The majority of people never experience any symptoms during head lice infestation.
life cycle of head lice. An adult female louse lays 8 eggs a day during her lifetime. When that egg hatches the nymph must go through 3 molts before becoming an adult louse able to mate and lay eggs. After mating within 1-2 days the female louse starts to lay nits on the human hair shaft. Each nit is firmly glued to the hair shaft 1/8″ from the scalp with a substance that is much like super-glue. Thus nits are very difficult to remove from the hair shaft. In addition nits are impervious to chemical and pesticide lice treatments. This is why parents claim that head lice “never seem to go away” or “seem to keep coming back”. In fact if you treat your child with a pesticide lice shampoo it does nothing to kill the nits. Within a few days of the head lice pesticide treatment the nits begin hatching again, thereby starting up a whole new head lice colony.