How do lice cause pediculosis and pthiriasis?

Updated: Mar 01, 2018
  • Author: Lyn C C Guenther, MD, FRCPC, FAAD; Chief Editor: Michael Stuart Bronze, MD  more...
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Answer

Lice are ectoparasites that live on the body. Lice feed on human blood after piercing the skin and injecting saliva, which may cause pruritus due to an allergic reaction. [4] Lice crawl but cannot fly or hop. [4]


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