Head lice - Causes 

Head lice are transmitted by close head-to-head contact with someone who has head lice. The lice cannot fly, jump or swim, but they can climb from one hair to another.

A head lice infestation is not the result of dirty hair or poor hygiene. Head lice can affect all types of hair irrespective of its condition and length.

Head lice only affect humans and cannot be passed on to animals or be caught from them.