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Causes of head lice
Anyone can get head lice, but they are most common in children aged between four and 11. This may be because of their close contact with each other at school. Girls seem to be more likely to get them than boys.
You can only get head lice through head to head contact. They cannot hop, fly or swim. Head lice can only live for a short time away from the scalp and those found away from the head are usually dying.
Head lice can be found in all types and lengths of hair - having head lice is not a sign that your hair is dirty. They are just as often found living in clean hair.
http://www.bupa.co.uk/individuals/health-information/directory/h/head-lice#####Block207316
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