Lice are not known to carry disease. They are insects, not germs. From person to person. From person to item to person . When a person comes into contact with these items, infestation may occur.
Any human is a potential host.
Good personal hygiene does not necessarily prevent lice infestation. Inspect scalp at crown of head, behind the ears and nape of neck. They adhere firmly to the hair shaft, usually near the scalp. Live lice are the size of a small ant, but well camouflaged and move quickly from light. Use only as directed.