- Parasitic insects that feed on human blood
- Contracted most commonly by direct (head-to-head) contact with infected person
- Also via clothing that's infested (e.g. hats), bed sheets, couches
- Spread via sexual contact (pubic lice)
- Often occurs in outbreaks amongst kids
- Can also cause pubic region itching
- Can sometimes see moving lice on scalp
- Nits on hair shaft