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Some HPV types, such as HPV5, may establish infections that persist for the lifetime of the individual without ever manifesting any clinical symptoms. HPV types 1 and 2 can cause common warts in some infected individuals. [18] HPV types 6 and 11 can cause genital warts and laryngeal papillomatosis. [1] Many HPV types are carcinogenic. [19]
Papillomaviridae is a family of non-enveloped DNA viruses whose members are known as papillomaviruses. [1] Several hundred species of papillomaviruses, traditionally referred to as "types", [2] have been identified infecting all carefully inspected mammals, [2] but also other vertebrates such as birds, snakes, turtles and fish.
However, some people can have elevated levels of p16 but test negative for HPV and vice versa. This is known as discordant cancer. The 5-year survival for people who test positive for HPV and p16 is 81%, for discordant cancer it is 53–55%, and 40% for those who test negative for p16 and HPV. [33] [34]
For starters, it does not mean you have cancer—or that you’re destined to develop it.
Genital HPV infections have an estimated prevalence in the US of 10–20% and clinical manifestations in 1% of the sexually active adult population. [29] US incidence of HPV infection has increased between 1975 and 2006. [29] About 80% of those infected are between the ages of 17 and 33. [29]
HSIL generally corresponds to the histological classification of CIN 2 or 3. [citation needed] HSIL treatment involves the removal or destruction of the affected cells, usually by LEEP. Other methods include cryotherapy, cautery, or laser ablation, but none are performed on pregnant women for fear of disrupting the pregnancy. [11]
The cause of CIN is chronic infection of the cervix with HPV, especially infection with high-risk HPV types 16 or 18. It is thought that the high-risk HPV infections have the ability to inactivate tumor suppressor genes such as the p53 gene and the RB gene, thus allowing the infected cells to grow unchecked and accumulate successive mutations, eventually leading to cancer.
Gardasil is an HPV vaccine for use in the prevention of certain strains of human papillomavirus (HPV). [10] [7] [8] [9] [11] It was developed by Merck & Co. [12] High-risk human papilloma virus (hr-HPV) genital infection is the most common sexually transmitted infection among women. [13]