What are head lice?

Head lice (Pediculus humanus capitis) are tiny wingless insects about two millimetres long which live on the scalp and neck of humans. When an infestation occurs there may be up to 12 adult lice on the scalp at any one time. They feed from human blood and must eat at least twice a day; they cannot survive for more than one day at room temperature off a human body. A female louse can lay eggs at the rate of about six per night up to a total of 100.


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