A primer on head lice:

It’s harder to catch lice than you might think. Your head needs to be close to a person’s head who has lice. Sometimes lice can be spread by sharing hats or hair brushes. There’s no need to panic over a case of head lice. It just contributes to the person (who already may feel dirty) feeling bad.

Head lice (pediculosis capitis) causes more anxiety and distress among parents (and schools and neighbors and relatives and friends) than most other pediatric conditions. Read this informative article from CNN.com here.