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A wide variety of HPV types can cause genital warts, but types 6 and 11 together account for about 90% of all cases. [35] [36] However, in total more than 40 types of HPV are transmitted through sexual contact and can infect the skin of the anus and genitals. [4] Such infections may cause genital warts, although they may also remain asymptomatic.
HPV types 6 and 11 are responsible for causing majority of genital warts whereas HPV types 16, 18, 31, 33, and 35 are also occasionally found. [5] It is spread through direct skin-to-skin contact, usually during oral , manual , vaginal , or anal sex with an infected partner.
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.
The researchers found there were 3.4 cases of HPV-related cancer per 100,000 vaccinated males, while there were more than double that amount, 7.5 cases per the same number of unvaccinated males.
Gardasil is designed to prevent infection with HPV types 16, 18, 6, and 11. HPV types 16 and 18 currently cause about 70% of cervical cancer cases, [13] [14] and also cause some vulvar, vaginal, [11] penile and anal cancers. [12] HPV types 6 and 11 are responsible for 90% of documented cases of genital warts. [17]
Human papillomavirus—HPV is a risk factor in the development of penile cancer. [9] According to the Centers for Disease Control and Prevention (CDC), HPV is responsible for about 800 (about 40%) of 1,570 cases of penile cancer diagnosed annually in the United States. [10] [11] There are more than 120 types of HPV. [12]
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