How does the incidence of pediculosis and pthiriasis (lice infestation) vary by sex?

Updated: Aug 16, 2019
  • Author: Lyn C C Guenther, MD, FRCPC, FAAD; Chief Editor: Michael Stuart Bronze, MD  more...
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Girls are at higher risk of head louse infestation than boys because of social behavior (eg, social acceptance of close physical head-to-head contact and, less commonly, sharing of hats, scarves, combs, brushes, hair ties and lying on a sofa, carpet, or stuffed toy that has recently come in contact with an infested person); hair length is not a factor. No sexual predilection exists in body or pubic louse infestation; males and females are equally likely to become infested.

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