Human papillom viruses (HPV): Invisible danger and how we can protect ourselves from it
Have you ever thought about the invisible dangers hidden behind the term “HPV”? You may know the human papillomavirus simply as one of many infections—but did you know that certain types of HPV are responsible for various types of cancer? Whether it’s cervical or throat cancer, HPV can often remain undetected for years before the first symptoms appear. But there is good news: vaccination can drastically reduce this risk. Are you already protected? If not, it might be time to think about it.
What is behind the HPV virus?
Human papillomaviruses (HPV) are the most common sexually transmitted infection worldwide, and according to the Robert Koch Institute (RKI), it is estimated that a large portion of the population will come into contact with these viruses at some point in their lives. But what exactly is behind these viruses, how is the risk of infection and related diseases assessed, and what protection options are available? This article explores the background of HPV, explains the risks posed by the viruses, and highlights the importance of screening and vaccination.
What Are Human Papillomaviruses (HPV)?
HPV is a family of viruses comprising over 200 different types, of which about 40 can infect the anogenital region—that is, the skin and mucous membranes in the genital and anal areas. HPV types can be divided into high-risk and low-risk types: While low-risk types such as HPV 6 and 11 often cause genital warts, high-risk types such as HPV 16 and 18 are considered carcinogenic and can, if left untreated, lead to various types of cancer.
Transmission
Routes and Risk of HPV Infection
Human papillomaviruses are primarily transmitted through skin-to-skin and mucous membrane contact, most commonly during sexual intercourse. Since the viruses can remain undetected in the affected skin and mucous membrane cells for a long time, the infection often remains asymptomatic and is frequently passed on unknowingly. This is particularly relevant because some high-risk types can also lead to cancer in the throat, which is transmitted through oral sex.
The Robert Koch Institute estimates that about 80% of all sexually active people will be infected with HPV at some point in their lives. Even though many infections are fought off by the immune system itself, persistent infections—that is, infections that last for an extended period—can pose a significant risk, particularly with high-risk types.
HPV and Cancer Risk
An HPV infection is usually harmless, but high-risk types can cause serious health problems. They are the leading cause of cervical cancer, which is the fourth most common cancer among women worldwide. According to the RKI, HPV infections can also cause anal cancer as well as cancers in the genital and head and neck regions (e.g., tongue and throat cancer). In fact, it is estimated that approximately 99% of cervical cancer cases are attributable to HPV infection.
Statistics and prevalence data in Germany
In
Germany
, approximately 4,600 women and 1,600 men are diagnosed with HPV-related cancers each year. Most of these cases are attributable to HPV 16 and HPV 18, which are the most aggressive carcinogenic types. The data from the Data from the RKI also show that approximately 15% of cancers in men are caused by HPV—one reason why the HPV vaccine is recommended not only for girls but also for boys.
HPV Vaccination – Protection for the Future
The HPV vaccination is one of the most effective preventive measures against cancer-causing HPV types. In Germany, the Standing Committee on Vaccination (STIKO) recommends the HPV vaccination for girls and boys starting at age 9, ideally before their first sexual contact. The vaccine protects against the most common and dangerous high-risk types, such as HPV 16 and 18, which are responsible for 70% of cervical cancer cases, as well as against the low-risk types 6 and 11, which can cause genital warts.
Vaccination Coverage in Germany
In Germany, vaccination coverage stands at about 45% among girls and only 20% among boys, which is below the 80% rate recommended by the WHO. According to the RKI, vaccination programs and public education are crucial tools for increasing acceptance and building herd immunity in the long term, which also protects unvaccinated individuals.
Scientific findings on efficacy
Studies have shown that the HPV vaccine can drastically reduce the incidence of HPV-related diseases. Countries such as Australia, which have high vaccination rates, have observed a decline in cervical cancer cases of up to 87%. Positive effects are also expected in Germany if the vaccination rate continues to rise and young people are immunized at an early age.
Risk factors
for
HPV infection
An increased risk of HPV infection arises from a variety of factors, including physical conditions, sexual behavior, and certain lifestyle habits.
Sexual Behavior
Having multiple sexual partners or frequently changing partners increases the risk, as HPV is primarily transmitted through direct skin contact and sexual intercourse. Early onset of sexual activity also increases the likelihood of infection.
Weakened Immune System
People with a weakened immune system, for example due to conditions like HIV or certain medications, are more likely to be unable to fight off an HPV infection. A weakened immune system makes it easier for the virus to persist in the body.
Smoking
Smoking impairs the immune system and damages the mucous membranes, which increases the risk of HPV infection and, in particular, of HPV-related precancerous lesions. In women especially, smoking significantly increases the risk of cervical cancer.
Oral and unprotected sexual intercourse
Failing to use protective measures such as condoms increases the risk of infection. Condoms cannot completely prevent HPV, but they significantly reduce the risk of transmission. Oral sex also increases the risk of infection in the mouth and throat.
Young age and gender
Younger people, especially those under 25, are more likely to become infected with HPV, which is related to the biological and immunological conditions at this age. Overall, women are more frequently affected by HPV infections and develop specific HPV-related cancers, such as cervical cancer.
Partners at high risk of infection
If a sexual partner has multiple sexual partners or has already had an HPV infection, the risk of infection increases, even if the individual has only a few sexual partners.
What stages of HPV can occur?
Acute infection
Immediately after transmission, HPV multiplies in the infected skin or mucosal cells. In this early phase, the infection usually remains asymptomatic, meaning there are no visible signs or symptoms. Often, the infected person does not recognize the infection at this stage, and the immune system can often eliminate the virus on its own within a few months.
Persistent infection
In some cases, however, the immune system is unable to completely clear the virus, and it remains in the body for an extended period. This persistent infection is particularly problematic because it can lead to long-term cellular changes, especially with high-risk HPV types. In women in particular, the virus often persists in the cervical region, thereby increasing the risk of developing cancer later on.
Precancerous Lesions (Dysplasia)
A long-lasting HPV infection, especially caused by high-risk types such as HPV 16 and 18, can lead to cellular changes over the course of years. These so-called dysplasias are considered precancerous lesions and frequently occur in the cervix as well as in other anogenital areas. The changes are classified by severity, ranging from mild dysplasia (CIN 1) to severe dysplasia (CIN 3). Early detection through screening can identify these changes before they worsen further.
Cancer Stages
If severe dysplasia remains untreated for years, it can develop into invasive cancer. HPV-related cancers most commonly affect the cervix, but also the oropharyngeal region, the anus, and the genitals. The progression from dysplasia to cancer usually takes years to decades, underscoring the importance of regular screening.
What complications can occur?
Depending on the virus type and course of the infection, an HPV infection can lead to various complications, ranging from benign growths to malignant cancers.
Genital warts (condylomas)
Often caused by low-risk types such as HPV 6 and 11, genital warts appear as benign but contagious growths in the genital and anal areas. They are usually painless but can become uncomfortable due to friction.
Cervical cancer
HPV is the main cause of cervical cancer and is particularly associated with the high-risk types HPV 16 and 18. The development of cancer can take many years and is often detected through regular screenings before it progresses to an advanced stage.
Anal Cancer
The anal canal can also be affected by persistent HPV infections, particularly with high-risk types. People with weakened immune systems are at increased risk, and cancer screening is especially recommended for them.
Penile cancer
Although less common, HPV can also lead to penile cancer, especially if the virus remains in the tissue for a long period of time. Regular monitoring and treatment of HPV-related cellular changes can prevent progression to cancer.
Vaginal and vulvar cancer
HPV can also cause vaginal and vulvar cancer. The infection can persist for years before leading to malignant changes in the tissue.
Oral and throat cancer
High-risk types such as HPV 16 can also lead to oral and oropharyngeal cancer through oral contact, particularly in the throat, tongue, and tonsils. This cancer is increasingly affecting nonsmokers and people under the age of 50.
Prevention and Early Detection
In addition to vaccination, screening plays an important role in the prevention of HPV-related diseases. The Pap test, a cytological smear of the cervix, and the HPV DNA test are effective tools for the early detection of cervical cancer and precancerous lesions. In Germany, women between the ages of 20 and 60 are recommended to undergo regular screening.
What role do HPV tests play?
The HPV test is particularly important because it specifically targets cancer-causing viruses and can detect a persistent infection at an early stage. An HPV test is used to detect the presence of high-risk HPV types in cells, particularly in the cervix. It can be performed as a standalone test or in combination with a Pap smear to assess the risk of cervical cancer at an early stage. The test analyzes HPV DNA and identifies specific high-risk types associated with cancer. This is particularly recommended for women over 30 to detect and treat persistent infections early.
Tips for Prevention in Daily Life
In addition to vaccination and screening, there are other measures that can help prevent HPV infection:
- Protection through condoms: Even though condoms do not offer 100% protection, they can reduce the risk of HPV transmission.
- Making Informed Choices About Partners: Having an open conversation with sexual partners about sexual health and the risks of infection can be helpful.
- Boosting the Immune System: A healthy immune system is better equipped to fight off the virus. This includes a healthy diet, adequate sleep, and stress reduction.
Why is HPV education so important?
Human papillomaviruses affect almost everyone at some point in their lives, yet knowledge about the risks and prevention options is often insufficient. However, with the HPV vaccine and regular screenings, effective measures are now available to significantly reduce the risk. It is therefore important that both adolescents and adults are educated about HPV and take an active role in their health—whether through vaccination, screening, or a healthy lifestyle. The fight against HPV is a crucial step toward a healthier future free from preventable cancers.
