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🦠microbiology review

Pediculus humanus

Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025

Definition

Pediculus humanus is a species of lice that infests humans, causing pediculosis. It can act as a vector for several bacterial infections affecting the circulatory and lymphatic systems.

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5 Must Know Facts For Your Next Test

  1. Pediculus humanus includes two subspecies: Pediculus humanus capitis (head louse) and Pediculus humanus corporis (body louse).
  2. Body lice are known vectors for Bartonella quintana, the bacteria responsible for trench fever.
  3. They can also transmit Rickettsia prowazekii, which causes epidemic typhus.
  4. Infestation with body lice is often associated with poor hygiene and crowded living conditions.
  5. Diagnosis typically involves finding live lice or nits on the body or clothing.

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