Head lice are annoying, but they don't actually make people sick, and children with the condition should not be kept away from school, according to new guidelines from a leading group of pediatricians.The guidelines, from the American Academy of Pediatrics, say that although head lice can cause itching, they are not known to spread disease, and the insects are not very likely to spread from one child to another within a classroom. Rather, it is usually direct head-to-head contact that spreads lice.For this reason, "no healthy child should be excluded from school or allowed to miss school time because of head lice or nits," the guidelines say. (Nits are the eggs of head lice.) Most doctors who care for children agree that school policies requiring children to be free from nits before returning to school should be abandoned, the AAP says. In addition, screening kids at schools for head lice does n