 Children with nits on their hair have a 35–40% chance of also being infested with living lice and eggs.If lice are detected, the entire family needs to be checked (especially children up to the age of 13 years) with a louse comb, and only those who are infested with living lice should be treated.As long as no living lice are detected, the child should be considered negative for head louse infestation.