Below is an instruction from Human. Write a response.
    ### Instruction:
    How to prevent Parasites - Lice - Head Lice ?
    ### Response:
    Head lice are spread most commonly by direct head-to-head (hair-to-hair) contact. However, much less frequently they are spread by sharing clothing or belongings onto which lice have crawled or nits attached to shed hairs may have fallen. The risk of getting infested by a louse that has fallen onto a carpet or furniture is very small.
    