HPV, or human papillomavirus, belongs to the Papillomaviridae family. To date, more than 150 types of viruses have been known based on their DNA sequences.
All tissues of the human body are susceptible to infection with HPV, however, each particular type of virus exhibits tropism (selective tissue selection) to a specific tissue. Some HPV viruses can penetrate and multiply in the epithelium of the skin, while some will infect and multiply in the mucosa of the genitals, throat and conjunctiva, causing warts. Some of them may turn out to be precancerous lesions that will develop into tumors over time.
Taking into account the ability of papilloma to develop neoplasms, HPV viruses can be divided into highly oncogenic or low-oncogenic.