How are head and body lice differentiated in pediculosis and pthiriasis (lice infestation)?

Updated: Aug 16, 2019
  • Author: Lyn C C Guenther, MD, FRCPC, FAAD; Chief Editor: Michael Stuart Bronze, MD  more...
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Head and body lice are similarly shaped, but the head louse is smaller. Nevertheless, the 2 species can interbreed. The pubic louse, or "crab," is morphologically distinct from the other two.

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