Warts are caused by the DNA-containing human papillomavirus (HPV). There are at least
100 genetically different types of HPVs.
- The virus enters the skin after direct contact with recently shed viruses kept alive in warm, moist environments such as a locker room, or by direct contact with an infected person. The entry site is often an area of recent injury. The incubation time (from when the virus is contracted until a wart appears) can be
one to eight months.
- Contrary to popular mythology, touching a frog will not give a person warts.
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