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what is life cycle of head lice?

11 / 02 / 2020

A female head louse lays eggs by cementing them to hairs, where they are kept warm by the scalp. After 7 to 10 days the nymph louse hatches out of the egg, leaving a shiny white empty eggshell (nit), which may be found anywhere along a strand of hair. Head lice feed by biting the scalp and feeding on blood. They take 9 to 12 days to become fully grown. Once mature, they can move from head to head if direct contact is made. Head lice typically live for about 25 to 35 days. A female head louse can lay eggs as early as 7 days after she has hatched and will produce 4 to 6 eggs per day. To break the cycle and stop lice spreading, head lice need to be removed within 7 days of hatching.