10 Things You Should Know About Human Papillomavirus (HPV)

The human papillomavirus (HPV) is a viral infection transmitted via intimate contact with another person. More than 150 different strains of HPV have been identified, and the subset of strains associated with increased cancer risk are collectively called the "high-risk" strains.

Despite increased awareness about HPV, there remains a fair amount of confusion about the virus as well as about the vaccine that can help to prevent it. Below you'll find 10 must-know facts about HPV to help you understand the infection and your risk.


HPV Is More Common Than You May Think

Romantic young couple kissing on beach
Matt Dutile/Getty Images

It is estimated that over 79 million Americans are living with HPV, making it the most common sexually transmitted disease in the U.S.

According to the Centers for Disease Control and Prevention (CDC), among adults between the ages of 18 and 59, 42.5% are infected with a genital HPV and 7.3% are infected with an oral HPV.

It is so common, in fact, that researchers believe almost all sexually active people will get the virus at some point in their lives. 


You Don't Need to Have Intercourse to Get HPV

Close up of female feet.
santypan / Getty Images

HPV is transmitted through skin-to-skin sexual contact. This shouldn't suggest, however, that intercourse is the sole route of transmission. In fact, no penetration of any sort is needed to transmit HPV, and any area not covered by a condom is vulnerable to HPV exposure.

By and large, vaginal and anal intercourse are the activities most associated with HPV transmission. Although less common, the virus can also be passed through oral sex. The risk only increases if you have multiple sex partners or have sex with someone who has had many partners. 


Not All Types of HPV Cause Cancer

HPV infection, artwork
SCIEPRO/Getty Images

There are more than 100 different strains of HPV. Some are "high-risk" strains associated with cancer; others are "low-risk" types known to cause genital warts.

The strains considered to be of high risk are types 16 and 18, which together cause 70% of cervical cancers and pre-cancerous cervical lesions.

There is a common misconception among many that genital warts are a precursor to cancer. This is not the case. The HPV strains responsible for genital warts are not known to cause cancer.

With that being said, having a genital wart shouldn't suggest you are "safe." Persons can be infected with multiple HPV types, and the appearance of a wart should be a warning sign of possible exposure to higher risk strains.


There Is a Vaccine, but No Cure for HPV

Cervical Cancer Vaccine
BSIP/UIG/Getty Images

The types of HPV that cause genital warts and cervical cancer can be managed but not cured. Similarly, genital warts can be treated by removing them, but their removal does not eradicate the underlying virus.

While there are vaccines today that can greatly reduce the risk of HPV in young people, they are not sterilizing vaccines and cannot neutralize the virus in people already infected.


Most People With HPV Do Not Have Symptoms

Pap Smear on a medical test form
Courtney Keating/Getty Images

You cannot know if someone has HPV by looking at them or searching for genital warts. It doesn't work that way. Most people, in fact, have no signs of infection and may only become aware of the condition if they have an abnormal Pap smear result.

But, even for people who do have symptoms, they are often either overlooked or misunderstood.


The HPV Vaccine Does Not Protect Against All Strains

Gardasil 9 Package. Merck

There are three HPV vaccines that can protect against some but not all of the high-risk strains:

  • Gardasil protects against four of the most common types and the two that cause 9% of all genital warts.
  • Gardasil 9 protects against all 4 common types and an additional five strains.
  • Cervarix protects against the two most common high-risk strains but provides no protection against genital warts.

The only HPV vaccine available in the United States is Gardasil 9.

While these vaccines typically provide ample protection, they may fall short in those assigned female at birth who are living with HIV. This population may develop cervical cancer as a result of an atypical HPV type.


HPV Testing and Sex Assigned at Birth

Man Leaning on Woman's Shoulder
Westend61 / Getty Images

The HPV test can be performed on those assigned female at birth in conjunction with a Pap smear during a routine gynecological exam. The U.S. Preventive Services Task Force (USPSTF) endorses routine HPV testing as follows:

  • Those assigned female at birth ages 21 to 65 should have a Pap test and an HPV test every three years.
  • Those under 21 and over 65 do not need HPV screening but may be tested in the event of an abnormal Pap smear result.

By contrast, the American Cancer Society (ACS) recommends people with a cervix undergo HPV primary testing—rather than a Pap test—every five years, starting at age 25 and continuing through 65. In doctors' offices and other healthcare facilities that do not have access to HPV primary testing, Pap tests every three years is regarded as acceptable.

There is no HPV test available to detect genital HPV in penises. However, some doctors may run an HPV test on an anal Pap smear in high-risk individuals who engage in receptive anal sex. 


Some Doctors Are Reluctant to Do HPV Testing

CC license at https://www.pexels.com/photo/doctor-medical-medical-records-clipboard-34846/
Wesley Wilson

One of the reasons why health agencies are reluctant to issue routine testing recommendations is that the benefits of HPV testing are still largely uncertain.

While a negative HPV test is a good indication that you won't get cancer, a positive result often means nothing. This is because the majority of HPV infections go away in two years without any complications. As such, a positive result may cause more distress than necessary or direct medical investigations that are not needed.

HPV Doctor Discussion Guide

Get our printable guide for your next doctor's appointment to help you ask the right questions.

Doctor Discussion Guide Woman

HPV Vaccination Is Not Just for Young People

Adolescent students.
Hero Images/Getty Images

The CDC recommends routine HPV vaccination for all adolescents aged 11 and 12, although the vaccine can be administered as early as nine years old. "Catch-up" vaccination for those between 13 and 26 is also recommended.

For certain individuals over 26, vaccination may still be beneficial. The CDC recommends gay and bisexual men and transgender people be immunized even if they're older as they run a higher risk of anal and cervical cancer than the general population.

This increased risk of exposure to HPV is tied to gay, bisexual, and transgender exclusion from social life and employment that increases the likelihood of people in these communities engaging in survival sex work.

The CDC advises immune-compromised persons (including those with HIV) be vaccinated regardless of age as well.

The ACS guidelines for HPV vaccination differ from those of the CDC. In 2020 ACS began recommending routine HPV vaccination begin at age 9 to help support earlier vaccination rates overall. ACS also began recommending against vaccination in people older than 27 due to the low expected benefit and to shortage of the vaccine.

If you are older than 26 and believe you may be at increased risk for cervical or anal cancer, don't hesitate to ask a doctor about getting vaccinated. It will cost around $100, which your insurance may cover.


Getting the HPV Vaccine Does Not Mean You Can Skip Cancer Screening

Even if you get the HPV vaccine, you need to be vigilant about getting screened for cervical cancer. The vaccine shows a reduction in more advanced precancers, but it has not been around long enough to provide the 20 years of data required to indicate a reduction in actual cancer cases.

Was this page helpful?
Article Sources
Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
  1. U.S. Centers for Disease Control and Prevention. Sexually Transmitted Infections Treatment Guidelines, 2021. MMWR. Published July 23, 2021.

  2. Centers for Disease Control and Prevention. Genital HPV infection - fact sheet. Updated August 20, 2019.

  3. Sabeena, S., Bhat, P., Kamath, V., and G. Arunkumar. Possible non‐sexual modes of transmission of Human Papilloma Virus. Journal of Obstetrics and Gynecology Research. 2017. 43(3):427-435. doi:10.1111/jog.13248

  4. World Health Organization. Human papillomavirus (HPV) and cervical cancer. Updated January 24, 2019.

  5. Centers for Disease Control and Prevention. HPV vaccine information for young women. Updated December 28, 2016.

  6. Centers for Disease Control and Prevention. Human papillomavirus (HPV) vaccination: What everyone should know. Updated November 22, 2016.

  7. Fontham ETH, Wolf AMD, Church TR, et al. Cervical cancer screening for individuals at average risk: 2020 guideline update from the American Cancer Society. CA Cancer J Clin. Jul 30, 2020. doi:10.3322/caac.21628

  8. Centers for Disease Control and Prevention. HPV and men - fact sheet. Updated December 28, 2016.

  9. Saslow D, Andrews KS, Manassaram-baptiste D, et al. Human papillomavirus vaccination 2020 guideline update: American Cancer Society guideline adaptation. CA Cancer J Clin. 2020; doi:10.3322/caac.21616