Where does lice come from originally?

if one person get it from another an that one didnt , then how did they catch it? it had to come somewhere.Where does lice come from originally?
The South.
No, lice can live in furniture and bedding and pets can be carrier from the outside, so the next dive is to humans just from environment interaction.
I repeatedly wondered that myself. I think it is from man dirty or from an animal. I am anxious to find out more answers.
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Funnily enough you cant get hold of lice from pets.They seem to resembling clean fuzz.