What is the risk of transmission of an untreated wart?

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Abstract

EVIDENCE-BASED ANSWER

The risk of transmission of untreated warts to unaffected individuals is not clear, but having a family member with a wart doubles the risk of developing a wart, whereas having classmates with warts slightly increases the risk of developing a wart (SOR: B, single prospective cohort study). Although not directly related to exposure to untreated warts, public shower use, amount of public pool use, and failure to wear a protective sock when swimming are additional risk factors for developing warts (SOR: B, systematic review of case-control and cross-sectional studies). Experts have stated that warts can be locally spread by abrasion, and that skin-to-skin contact and fomite contact are part of interpersonal wart transmission (SOR: C, consensus guideline).

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