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Pediculus Humanus Capitis (Head Lice)

Head lice are wingless insects spending their entire life on the human scalp and feeding exclusively on human blood. Head-to-head contact is by far the most common route of lice transmission.

PubMed Health Glossary
(Source: Wikipedia)

Smaller than the head of a match: adult louse and nit Click to enlarge

Smaller than the head of a match: an adult louse and a nit Institute for Quality and Efficiency in Health Care (IQWiG)

The life cycle of head lice Click to enlarge

The life of cycle of head lice: from a nit to an adult louse Institute for Quality and Efficiency in Health Care (IQWiG)

About Human Head Lice

Adult head lice are roughly 2—3 mm long. Head lice infest the head and neck and attach their eggs to the base of the hair shaft. Lice move by crawling; they cannot hop or fly.

Head lice infestation, or pediculosis, is spread most commonly by close person-to-person contact. Dogs, cats, and other pets do not play a role in the transmission of human lice.
CDC - Centers for Disease Control and Prevention

Related conditions

Terms to know

Nits
The eggs (nits) of head lice. Can be mistaken for dandruff, but they are adherent to the hair shafts....
Parasites
An animal or plant that gets nutrients by living on or in an organism of another species. A complete parasite...
Pediculosis Capitis (Head Lice Infestation)
Infection of the head hair and scalp by the head louse (Pediculus humanus capitis). Itching from lice bites i...

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