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Human papillomavirus
EM of papillomavirus
Virus classification
Group: Group I (dsDNA)
Order: Unranked
Family: Papillomaviridae
Genera

Alphapapillomavirus
Betapapillomavirus
Gammapapillomavirus
Mupapillomavirus
Nupapillomavirus

Human Papilloma Viruses
Classification and external resources
ICD-10 B97.7
ICD-9 078.1 079.4
DiseasesDB 6032
eMedicine med/1037
MeSH D030361

A human papillomavirus (HPV) is a member of the papillomavirus family of viruses that is capable of infecting humans. Like all papillomaviruses, HPVs establish productive infections only in the stratified epithelium of the skin or mucous membranes. While the majority of the nearly 200 known types of HPV cause no symptoms in most people, some types can cause warts (verrucae), while others can – in a minority of cases – lead to cancers of the cervix, vulva, vagina, and anus in women or cancers of the anus and penis in men.[1]

More than 30 to 40 types of HPV are typically transmitted through sexual contact and infect the anogenital region. Some sexually transmitted HPV types may cause genital warts. Persistent infection with "high-risk" HPV types—different from the ones that cause warts—may progress to precancerous lesions and invasive cancer.[2] HPV infection is a cause of nearly all cases of cervical cancer;[3] however, most infections with these types do not cause disease.

Most HPV infections in young females are temporary and have little long-term significance. 70% of infections are gone in 1 year and 90% in 2 years.[4] But when infection persists—in 5% to 10% of infected women—there is high risk of developing cervical precancer (lesions on the cervix), which can progress to invasive cervical cancer. This process usually takes 15–20 years, providing many opportunities for detection and treatment of the pre-cancerous condition, often with high cure rates.

In the US and other high-resource countries, a cervical Papanicolaou (Pap) test is used to detect abnormal cells which may develop into cancer. A cervical examination also detects warts and other abnormal growths which become visible as white patches of skin after they are washed with acetic acid (visual inspection). Abnormal and cancerous areas can be removed with a simple procedure, typically with a cauterizing loop or—more common in the developing world—by freezing (cryotherapy). New HPV DNA tests are more sensitive than Pap or visual inspection and a lower-cost HPV test suitable for low-resource settings may become available soon, potentially making high-sensitivity screening feasible where it currently does not exist in Africa, Asia and Latin America.

Pap smears have reduced the incidence and fatalities of cervical cancer in the developed world, but even so there were 11,000 cases and 3,900 deaths in the U.S. in 2008. Cervical cancer has substantial mortality in resource-poor areas; worldwide, there are 490,000 cases and 270,000 deaths.[5][6] In large part because Pap is difficult to sustain in low-resource settings, eighty to 85 percent of cervical cancer deaths occur in the developing world.

HPV vaccines, Cervarix and Gardasil, which prevent infection with the HPV types (16 and 18) that cause 70% of cervical cancer, may lead to further decreases.[5][7]

Contents

History

In 1976 Harald zur Hausen published the hypothesis that human papilloma virus plays an important role in the cause of cervical cancer. In 1983 and 1984 zur Hausen and his collaborators identified HPV16 and HPV18 in cervical cancer.[8] In 1972, the association of the Human papilloma viruses with skin cancer in epidermodysplasia verruciformis was proposed by Stefania Jablonska in Poland. In 1978 Jablonska and Gerard Orth at the Pasteur Institute discovered HPV-5 in skin cancer.[9]

Prevalence

United States of America

HPV is estimated to be the most common sexually transmitted infection in the United States.[10] Most sexually active men and women will probably acquire genital HPV infection at some point in their lives.[11] The American Social Health Association reported estimates that about 75-80% of sexually active Americans will be infected with HPV at some point in their lifetime.[12][13] By the age of 50 more than 80% of American women will have contracted at least one strain of genital HPV.[14][15][16]

It was estimated that in the year 2000, there were approximately 6.2 million new HPV infections among Americans aged 15–44; of these, an estimated 74% occurred to people between ages 15–24.[17] Of the STDs studied, genital HPV was the most commonly acquired.[17]

Estimates of HPV prevalence vary from 14% to more than 90%.[18] One reason for the difference is that some studies report women who currently have a detectable infection, while other studies report women who have ever had a detectable infection.[19][20] Another cause of discrepancy is the difference in strains that were tested for.

One study found that, during 2003–2004, at any given time, 26.8% of women aged 14 to 59 were infected with at least one type of HPV. This was higher than previous estimates. 15.2% were infected with one or more of the high-risk types that can cause cancer. However only 3.4% were infected with one or more of the four types prevented by the Gardasil vaccine, which was lower than previous estimates.[10][21]

HPV prevalence by age[10]
Age (years) Prevalence (%)
14 to 19 24.5%
20 to 24 44.8%
25 to 29 27.4%
30 to 39 27.5%
40 to 49 25.2%
50 to 59 19.6%
14 to 59 26.8%

Note that prevalence decreases with age. This may be due to HPV infection being cleared by the immune system, or sinking to undetectable levels while still present in the body. HPV will probably remain in the infected person's cells for an indefinite time—most often in a latent state, but occasionally producing symptoms or disease.[citation needed] Recent studies from the Albert Einstein College of Medicine and from the University of Washington suggest that HPV may eventually be cleared in most people with well functioning immune systems. It appears that in some cases the virus does remain in the body indefinitely, producing symptoms if the immune system weakens.[citation needed]

Cervical cancer

The American Cancer Society estimates that in 2008, about 11,070 women in the United States will be diagnosed with invasive cervical cancer, and about 3,870 US women will die from this disease.[22]

Life cycle

The HPV life cycle strictly follows the differentiation program of the host keratinocyte. It is thought that the HPV virion infects epithelial tissues through micro-abrasions, whereby the virion associates with putative receptors such as alpha integrins and laminins, leading to entry of the virions into basal epithelial cells through clathrin-mediated endocytosis and/or caveolin-mediated endocytosis depending on the type of HPV. At this point, the viral genome is transported to the nucleus by unknown mechanisms and establishes itself at a copy number between 10-200 viral genomes per cell. A sophisticated transcriptional cascade then occurs as the host keratinocyte begins to divide and become increasingly differentiated in the upper layers of the epithelium.

E6/E7 proteins

The viral oncogenes, E6 and E7[23] are thought to modify the cell cycle so as to retain the differentiating host keratinocyte in a state that is favourable to the amplification of viral genome replication and consequent late gene expression. E6 in association with host E6 associated protein, which has ubiquitin ligase activity, act to ubiquitinate p53, leading to its proteosomal degradation. E7 (in oncogenic HPVs) acts as the primary transforming protein. E7 competes for retinoblastoma protein (pRb) binding, freeing the transcription factor E2F to transactivate its targets, thus pushing the cell cycle forwards. All HPV can induce transient proliferation, but only 16 and 18 can immortalise cell intes (in vitro). It has also been shown that HPV 16 and 18 cannot immortalise primary rat cells alone; there needs to be activation of the ras oncogene. In the upper layers of the host epithelium, the late genes L1 and L2 are transcribed/translated and serve as structural proteins which encapsidate (Encapsidation is the process of incorporating a nucleic acid sequence (e.g., a vector, or a viral genome) into a viral particle) the amplified viral genomes. Once the genome is encapsidated, the capsid appears to undergo a redox-dependent assembly/maturation event which is tied to a natural redox gradient that spans both suprabasal and cornified epithelial tissue layers. This assembly/maturation event stabilizes virions, and increases their specific infectivity.[24] Virions can then be sloughed off in the dead squames of the host epithelium and the viral lifecycle continues.[25]

Latency period

Once an HPV viron invades a cell, an active infection occurs, and the virus can be transmitted. Several months to years may elapse before squamous intraepithelial lesions (SIL) develop and can be clinically detected. The time from active infection to clinically detectable disease makes it difficult for someone who has become infected to establish which partner was the source of infection.

Types and associated diseases

Notable HPV types and associated diseases

Over 200 HPV types have been identified and are referred to by number. Types 16, 18, 31, 33, 35, 39, 45, 51, 52, 56, 58, and 59 are "high-risk" sexually transmitted HPVs and may lead to the development of cervical intraepithelial neoplasia (CIN), vulvar intraepithelial neoplasia (VIN), penile intraepithelial neoplasia (PIN), and/or anal intraepithelial neoplasia (AIN).

Disease HPV type
Common warts 2, 7
Plantar warts 1, 2, 4, 63
Flat warts 3, 10
Anogenital warts 6, 11, 42, 44 and others[26]
Genital cancers
  • Highest risk [26]: 16, 18, 31, 45
  • Other high-risk[26][27]: 33, 35, 39, 51, 52, 56, 58, 59
  • Probably high-risk[27]: 26, 53, 66, 68, 73, 82
Epidermodysplasia verruciformis more than 15 types
Focal epithelial hyperplasia (oral) 13, 32
Oral papillomas 6, 7, 11, 16, 32

Cancers

HPV-induced cancers[28]

About a dozen HPV types (including types 16, 18, 31 and 45) are called "high-risk" types because they can lead to cervical cancer, as well as anal cancer, vulvar cancer, penile cancer[28] and lung cancer[29][30] Several types of HPV, particularly type 16, have been found to be associated with oropharyngeal squamous-cell carcinoma, a form of head and neck cancer.[31][32] HPV-induced cancers often have viral sequences integrated into the cellular DNA. Some of the HPV "early" genes, such as E6 and E7, are known to act as oncogenes that promote tumor growth and malignant transformation. Oral infection with HPV increased the risk of oropharyngeal cancer independent of tobacco and alcohol use.[32]

The E6 and E7 proteins work by inhibiting tumor suppression genes involved in the p53 and the retinoblastoma protein (RB) metabolic pathways: E6 inhibits p53, while E7 inhibits p53, p21 and RB.[citation needed]

The p53 protein prevents cell growth and stimulates apoptosis in the presence of DNA damage. It causes BAX protein upregulation, which blocks the anti-apoptotic effects of the mitochondrial BCL-2 protein.[citation needed] In addition, p53 also upregulates the p21 protein, which blocks the formation of the Cyclin D/Cdk4 complex, thereby preventing the phosphorylation of RB and, in turn, halting cell cycle progression by preventing the activation of E2F. In short, p53 is a tumor suppressor gene that arrests the cell cycle when there is DNA damage.

E6 has a close relationship with the cellular protein E6-AP (E6-associated protein). E6-AP is involved in the ubiquitin ligase pathway. A system which acts to degrade proteins. E6-AP binds ubiquitin to the p53 protein, thereby flagging it for proteosomal degradation.

Genome organization of human papillomavirus type 16, one of the subtypes known to cause cervical cancer. (E1-E7 early genes, L1-L2 late genes: capsid)

An infection with one or more high-risk HPV types is believed to be a prerequisite for the development of cervical cancer (the vast majority of HPV infections are not high risk); according to the American Cancer Society, women with no history of the virus do not develop this type of cancer.[citation needed] However, most HPV infections are cleared rapidly by the immune system and do not progress to cervical cancer. Because the process of transforming normal cervical cells into cancerous ones is slow, cancer occurs in people who have been infected with HPV for a long time, usually over a decade or more (persistent infection).[33][34]

Sexually-transmitted HPVs also cause a major fraction of anal cancers and approximately 25% of cancers of the mouth and upper throat (the oropharynx) (see figure).[28] The latter commonly present in the tonsil area, and HPV is linked to the increase in oral cancers in non-smokers.[35][36] Engaging in anal sex or oral sex with an HPV-infected partner may increase the risk of developing these types of cancers.[31]

Studies show a link between HPV infection and penile and anal cancer,[28] and the risk for anal cancer is 17 to 31 times higher among gay and bisexual men than among heterosexual men.[37][38] It has been suggested that anal Pap smear screening for anal cancer might benefit some sub-populations of men or women who engage in anal sex.[39] There is no consensus that such screening is beneficial, or who should get an anal Pap smear.[40][41]

Warts

Skin warts

Papilloma

Some HPV infections can cause warts (verrucae), which are noncancerous skin growths. Infection with these types of HPV causes a rapid growth of cells on the outer layer of the skin.[42] Types of warts include:

  • Common warts: Some "cutaneous" HPV types, such as HPV-1 and HPV-2,[citation needed] cause common skin warts. Common warts are often found on the hands and feet, but can also occur in other areas, such as the elbows or knees. Common warts have a characteristic cauliflower-like surface and are typically slightly raised above the surrounding skin. Cutaneous HPV types can cause genital warts but are not associated with the development of cancer.
  • Plantar warts are found on the soles of the feet. Plantar warts grow inward, generally causing pain when walking.
  • Subungual or periungual warts form under the fingernail (subungual), around the fingernail or on the cuticle (periungual). They may be more difficult to treat than warts in other locations.[43]
  • Flat warts: Flat warts are most commonly found on the arms, face or forehead. Like common warts, flat warts occur most frequently in children and teens. In people with normal immune function, flat warts are not associated with the development of cancer.[44]

Genital warts are quite contagious, while common, flat, and plantar warts are much less likely to spread from person to person.

Genital warts

Genital or anal warts (condylomata acuminata or venereal warts) are the most easily recognized sign of genital HPV infection. Although a wide variety of HPV types can cause genital warts, types 6 and 11 account for about 90% of all cases.[45][46]

Most people who acquire genital wart-associated HPV types clear the infection rapidly without ever developing warts or any other symptoms. People may transmit the virus to others even if they do not display overt symptoms of infection.

HPV types that tend to cause genital warts are not those that cause cervical cancer.[1] However, since an individual can be infected with multiple types of HPV, the presence of warts does not rule out the possibility of high-risk types of the virus also being present.

The types of HPV that cause genital warts are usually different from the types that cause warts on other parts of the body, such as the hands or inner thighs.

Respiratory papillomatosis

HPV types 6 and 11 can cause a rare condition known as recurrent respiratory papillomatosis, in which warts form on the larynx[47] or other areas of the respiratory tract.[34][48]

These warts can recur frequently, may require repetitive surgery, may interfere with breathing, and in extremely rare cases can progress to cancer.[34][49]

HPV in immunocompromised patients

In very rare cases, HPV may cause epidermodysplasia verruciformis in immunocompromised individuals. The virus, unchecked by the immune system, causes the overproduction of keratin by skin cells, resulting in lesions resembling warts or cutaneous horns.[50]

For instance, Dede Koswara, an Indonesian man developed warts that spread across his body and became root-like growths. Attempted treatment by both Indonesian and American doctors included surgical removal of the warts.

Infection prevention

Condoms offer some protection against genital infection,[51] but any exposed skin can transmit the virus. Genital HPV infection is the most frequent sexually transmitted disease in the world.[52]

Vaccines

Two vaccines are available to prevent infection by some HPV types, Gardasil, marketed by Merck and Cervarix, marketed by GlaxoSmithKline. Both protect against initial infection with HPV types 16 and 18, which cause most of the HPV associated cancer cases. Gardasil also protects against HPV types 6 and 11, which cause 90% of genital warts.

The vaccines provide little benefit to women who have already been infected with HPV types 16 and 18—which includes most sexually active females. For this reason the vaccine is recommended primarily for those women who have not yet been exposed to HPV during sex. The World Health Organization position paper on HPV vaccination clearly outlines appropriate, cost-effective strategies for using HPV vaccine in public sector programs.[53]

Both are delivered in three shots over six months. In most countries they are approved only for female use, but are approved for male use in relevant countries like USA and UK. The vaccine has not any therapeutic effect on existing HPV infection or cervical lesions.[54]

Women should continue to seek cervical screening, such as Pap smear testing, even after receiving the vaccine. Cervical cancer screening recommendations have not changed for females who receive HPV vaccine.[54] Without continued screening, the number of cervical cancers preventable by vaccination alone is less than the number of cervical cancers prevented by regular screening alone.[55][56]

Both men and women are carriers of HPV.[57] Possible benefits and efficacy of vaccinating men are being studied. According to a study by Harvard University Medical School, to vaccinate boys may not be cost effective, especially if a widespread vaccination of girls continues.

No efficacy trials for children under 15 have been performed.[55]Duration of vaccine efficacy is not yet answered by rigorous methodologic trials. Cervarix efficacy is proven for 7.4 years with published data through 6.4 years while Gardasil efficacy is proven for 5 years.[55] Age of vaccination is less important than the duration of efficacy.[55]

Cervical and female genital infection

Since cervical and female genital infection by specific HPV types (see above) is highly associated with cervical cancer, those types of HPV infection have received most of the attention from scientific studies.

HPV infections in that area are transmitted primarily via sexual activity.[58]

At least 40 identified HPV types infect the genital tract. If a college woman has at least one different partner per year for four years, the probability that she will leave college with an HPV infection is greater than 85%.[59] Condoms do not protect from the virus because the areas around the genitals including the inner thigh area are not covered, thus exposing these areas to the infected person’s skin.[59]

Condoms

The Centers for Disease Control and Prevention says that male "condom use may reduce the risk for genital human papillomavirus (HPV) infection" but provide a lesser degree of protection compared with other sexual transmitted diseases "because HPV also may be transmitted by exposure to areas (e.g., infected skin or mucosal surfaces) that are not covered or protected by the condom."[60]

Studies have suggested that regular condom use can effectively limit the ongoing persistence and spread of HPV to additional genital sites in individuals who are already infected.[61][62] Thus, condom use reduces the risk that already infected individuals will progress to cervical cancer or develop genital warts.[51]

Contact with shared objects

Sharing of possible contaminated objects should be avoided.[63][64][65][66] Although possible, transmission by routes other than sexual intercourse is less common for female genital HPV infection.[58]

Oral infection

A review of scientific studies in healthy subjects has found carcinogenic HPV in 3.5% of the studies subjects and HPV16 in 1.3%.[67] Oral HPV infection is associated with HPV-positive oropharyngeal cancer. Odds of oral HPV infection increases with increases in the number of recent oral sex partners or open-mouthed kissing partners.[68]

Testing for infection

Cervical infection

In March 2003, the U.S. Food and Drug Administration (FDA) approved a test manufactured by Qiagen[69], which is a "hybrid-capture" test [70][71], as the primary screening tool for detecting HPV cervical infection as an adjunct to Pap testing, and may be performed during a routine Pap smear. It can detect the DNA of the 18 HPV types that most commonly affect the cervix and distinguish between "low" and "high-risk" HPV types, but it cannot determine the specific HPV types.[1][72][73]

According to the National Cancer Institute, "testing samples of cervical cells is an effective way to identify high-risk types of HPV that may be present. The FDA has approved an HPV test as a follow-up for women who have an ambiguous Pap test (a screening test to detect cervical cell changes) and, for women over the age of 30, for general cervical cancer screening. This HPV test can identify at least 13 of the high-risk types of HPV associated with the development of cervical cancer. The test can detect high-risk types of HPV even before there are any conclusive visible changes to the cervical cells." [74]

The recent outcomes in the identification of molecular pathways involved in cervical cancer provide helpful information about novel bio- or oncogenic markers that allow monitoring of these essential molecular events in cytological smears, histological or cytological specimens. These bio- or onco- markers are likely to improve the detection of lesions that have a high risk of progression in both primary screening and triage settings. E6 and E7 mRNA detection PreTect HPV-Proofer, (HPV OncoTect) or p16 cell-cycle protein levels are examples of these new molecular markers. According to published results these markers, which are highly sensitive and specific, allow to identify cells going through malignant transformation.[75][76]

Other testing

Although it is possible to test for HPV DNA in other kind of infections ,[77] there are no FDA-approved tests for general screening in the United States[37] or tests approved by the Canadian government[78], since the testing is inconclusive and considered medically unnecessary.[79]

Genital warts are the only visible sign of low-risk HPV, and can be identified with a visual check. These visible growths, however, are the result of non-carcinogenic HPV types. 5% acetic acid (vinegar) is used to identify both warts and squamous intraepithelial neoplasia (SIL) lesions with limited success[37] by causing abnormal tissue to appear white, but most doctors have found this technique helpful only in moist areas, such as the female genital tract.[37]

Treatment

There is currently no cure or treatment for HPV infection.[1][73][80] However, the viral infection, more often than not, clears by itself.[81] Experts do not agree on whether the virus is completely eliminated or reduced to undetectable levels, and it is difficult to know if one is contagious.[82]

Current research

Microbicides

Ongoing research has suggested that several inexpensive chemicals might serve to block HPV transmission if applied to the genitals prior to sexual contact.[83] These candidate agents, known as topical microbicides, are currently undergoing clinical efficacy testing. A recent study indicates that some sexual lubricant brands that use a gelling agent called carrageenan can inhibit papillomavirus infection in vitro.[84] See Carrageenan#Sexual lubricant and microbicide for details.

Clinical trials are needed to determine whether carrageenan-based sexual lubricant gels are effective for blocking the sexual transmission of HPVs in vivo.

HPV-16 exists in bacteria

The association between infectious microbes and persistent infection with human papillomavirus type 16 (HPV-16) in cervical cancer. Bacterial strains (identified as Enterococcus, Staphylococcus, Bacillus and Corynebacterium, based on their partial 16S rDNA sequence) were HPV-16 positive from 12 out of 14 cervical cancer biopsies. Total DNA was isolated from the four bacterial strains, and HPV-16 genes and genome were detected using polymerase chain reaction (PCR) and Southern blotting. RNA transcripts for HPV-16 E6 and L1 genes were detected in total bacterial RNA samples using reverse transcription-PCR, and HPV-16 L1 protein expression was detected in bacterial cells by Western blotting and immunocolloidal gold electron microscopy. The presence of virus particles in bacterial cells was demonstrated by transmission electron microscopy. The results suggest that bacteria carrying HPV-16 could provide a potential explanation for how infectious microbes contribute to the progression from HPV-16 infection to cervical cancer. [85]

Epidemiology

Cutaneous HPVs

Infection with cutaneous HPVs is ubiquitous.[86] Some HPV types, such as HPV-5, may establish infections that persist for the lifetime of the individual without ever manifesting any clinical symptoms. Like remora suckerfish that hitchhike harmlessly on sharks, these HPV types can be thought of as human commensals. Other cutaneous HPVs, such as HPV types 1 or 2, may cause common warts in some infected individuals. Skin warts are most common in childhood and typically appear and regress spontaneously over the course of weeks to months. About 10% of adults also suffer from recurring skin warts. All HPVs are believed to be capable of establishing long-term "latent" infections in small numbers of stem cells present in the skin. Although these latent infections may never be fully eradicated, immunological control is thought to block the appearance of symptoms such as warts. Immunological control is likely HPV type-specific, meaning that an individual may become immunologically resistant to one HPV type while remaining susceptible to other types.

Genital HPVs

A large increase in the incidence of genital HPV infection occurs at the age when individuals begin to engage in sexual activity. The great majority of genital HPV infections never cause any overt symptoms and are cleared by the immune system in a matter of months. As with cutaneous HPVs, immunity is believed to be HPV type-specific. Some infected individuals may fail to bring genital HPV infection under immunological control. Lingering infection with high-risk HPV types, such as HPVs 16, 18, 31 and 45, can lead to the development of cervical cancer or other types of cancer.[87] In addition to persistent infection with high-risk HPV types, epidemiological and molecular data suggest that co-factors such as the cigarette smoke carcinogen benzo[a]pyrene (BaP) enhance development of certain HPV-induced cancers.[88][89]

High-risk HPV types 16 and 18 are together responsible for over 65% of cervical cancer cases.[90][11] Type 16 causes 41 to 54% of cervical cancers,[11][91] and accounts for an even greater majority of HPV-induced vaginal/vulvar cancers,[92] penile cancers, anal cancers and head and neck cancers.[93]

Perinatal transmission

Although genital HPV types are sometimes transmitted from mother to child during birth, the appearance of genital HPV-related diseases in newborns is rare. Perinatal transmission of HPV types 6 and 11 can result in the development of juvenile-onset recurrent respiratory papillomatosis (JORRP). JORRP is very rare, with rates of about 2 cases per 100,000 children in the United States.[34] Although JORRP rates are substantially higher if a woman presents with genital warts at the time of giving birth, the risk of JORRP in such cases is still less than 1%.

DNA testing in resource-poor areas

Many resource-poor areas cannot provide regular screening, and must rely on infrequent screening. A study of cervical cancer screening of 131,746 women in rural India found that a single DNA test reduced the number of advanced cervical cancers and deaths over 8 years, while a single acetic acid examination or a single Pap screening did not. However, the DNA test cost US $30–40, which was unaffordable in many regions, it is time-consuming, and requires a sophisticated laboratory infrastructure. A simple, affordable, and accurate test is being evaluated in China and other countries.[94][95][96] The new test may become available on the market in 2010 at significantly lower cost than current tests.

With HPV testing, there was a 50 percent reduction [97][98] in the number of deaths from cervical cancer compared to unscreened women. Compared to other methods, the research showed the HPV testing reported the fewest false negatives.[99]

See also

References

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External links


Simple English

The Human papillomavirus that can infect the skin or mucous membranes (like the genitals, or inside the mouth) of animals and humans. Usually they cause warts. Some of them may cause cancer. There are over 100 different virus types in this group. About 30 virus types can be transmitted sexually. About 12-15 can cause cancer.

A first step in treatment is the use of salicylic acid. This is available in pharmacies, usually without a prescription. If this does not help, the wart can be frozen, and destroyed that way, or a laser can be used to destroy it. If this still does not help, different methods of chemotherapy can be used.

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