| http://www.w3.org/ns/prov#value | - Head lice are spread by direct contact with the hair of someone who is infected.[6] The cause of head lice infestations are not related to cleanliness.[5] Other animals, such as cats and dogs, do not play a role in transmission.[6] Head lice feed only on human blood and are only able to survive on human head hair.[4][5] When adults, they are about 2 to 3 mm long.[8] When not attached to a human, t
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