It is not known how common crab louse infestations are since many people treat themselves. The sales of the various non-prescription treatments have been increasing. Children are not generally infested. Females of teen and young adult age have the highest incidence of crab lice. Lice Anyone can get lice no matter how clean they are about their personal hygiene and their homes.
People get lice from people.
They don't come from pets. Head lice are readily transferred between persons who share items such as hats, hairbrushes, combs, or towels. Body lice spread from clothing, particularly underclothing. If infested clothing is left lying about, body lice can migrate and thus, spread to other clothes and people. Read and follow all directions on the product label.