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Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Several infections can cause or raise the risk of cancer, but infection does not mean cancer is inevitable. Vaccines can prevent some cancer-linked infections—most notably high-risk human papillomavirus (HPV) and hepatitis B virus (HBV)—but they do not prevent every infection associated with cancer or replace recommended screening, testing, or treatment.
Which infections are linked to cancer?
The National Cancer Institute (NCI) estimates that infectious agents account for about 13% of cancers worldwide. That is a population estimate, not an individual’s chance of developing cancer. Risk varies by infection and circumstance; many infected people never develop a related cancer.
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| Infection | Cancers associated with it | Relevant context |
|---|---|---|
| High-risk human papillomavirus (HPV) | Cancers of the cervix, anus, oropharynx, penis, vagina, and vulva | Persistent infection with certain HPV types can cause precancerous changes. HPV vaccines target types responsible for most HPV-associated cancers. |
| Hepatitis B virus (HBV) | Liver cancer | Chronic infection can lead to liver cancer; vaccination can prevent HBV infection. |
| Hepatitis C virus (HCV) | Liver cancer | Chronic infection is linked to liver cancer. The sources cited here emphasize testing and treatment, not vaccination. |
| Epstein-Barr virus (EBV) | Certain lymphomas and cancers of the nose and throat | EBV infection is common and lifelong. NCI says more than 90% of people worldwide are infected during their lifetime; most do not develop symptoms. |
| Human T-cell leukemia virus type 1 (HTLV-1) | Adult T-cell leukemia/lymphoma | Infection occurs more commonly in some regions, including Japan, Africa, the Caribbean, and South America. |
| Kaposi sarcoma-associated herpesvirus (KSHV/HHV-8) | Kaposi sarcoma, primary effusion lymphoma, and multicentric Castleman disease | Related disease is more likely in people with HIV or other causes of immune suppression. |
| Helicobacter pylori (H. pylori) | Non-cardia gastric adenocarcinoma and gastric MALT lymphoma | Long-term stomach inflammation can follow chronic infection. Antibiotics can eradicate the bacterium and reduce gastric cancer risk in studied groups. |
| Opisthorchis viverrini | Bile duct cancer (cholangiocarcinoma) | Infection is associated with eating raw or undercooked freshwater fish containing parasite larvae. |
| Schistosoma haematobium | Bladder cancer | Infection follows contact with contaminated fresh water in places where the parasite occurs. |
| HIV | Increased risk of cancers associated with other infections | HIV can contribute indirectly: immune suppression weakens the body’s ability to control certain cancer-associated infections. |
These associations are not all equally direct, and they do not mean that every person with one of these infections will develop cancer.
How vaccination lowers cancer risk
HPV vaccination prevents new infections
HPV vaccines protect against targeted HPV types that cause most HPV-associated cancers. Preventing those infections reduces the chance of developing the cancers they can cause. The vaccine does not clear an HPV infection that is already present or treat HPV-related disease.
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Hepatitis B vaccination prevents a cancer-linked infection
HBV vaccination prevents HBV infection, including the chronic infection that can lead to liver cancer. It does not treat an existing HBV infection.
Vaccines do not cover every infection on the list
The NCI material cited here says no preventive vaccine is available for EBV or HTLV-1. It does not identify vaccines for HCV, H. pylori, or the parasites listed above. Prevention therefore varies: H. pylori can be detected and treated, HCV can be tested for and treated, and exposure-related risk reduction may matter for some parasites. HIV care and other infection-related prevention also depend on individual circumstances.
U.S. HPV and hepatitis B vaccine guidance
The recommendations below are from U.S. Centers for Disease Control and Prevention (CDC) guidance. Vaccine schedules and eligibility can differ in other countries; follow local guidance.
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HPV vaccine
- Routine vaccination is recommended at ages 11–12 and may begin at age 9.
- Catch-up vaccination is recommended through age 26 for people who were not adequately vaccinated earlier.
- Most people who start before their 15th birthday need two doses, generally 6–12 months apart. People starting at ages 15–26 and immunocompromised people need three doses.
- For adults ages 27–45 who were not adequately vaccinated, a clinician and patient may decide together whether vaccination is useful.
Hepatitis B vaccine
CDC recommends HBV vaccination for adults ages 19–59. The vaccine is available for all age groups, and older adults may also be vaccinated depending on current guidance and risk. NCI notes that routine infant vaccination is used in the United States and many other countries.
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Why screening, testing, and treatment still matter
HPV vaccination and cervical screening serve different purposes. Vaccination reduces the risk from targeted HPV types; cervical screening can find changes that might become cancer. Vaccinated people should still follow recommended cervical screening, with the schedule based on jurisdiction, age, and personal history.
For infections without a preventive vaccine, the relevant next step may be testing, treatment, or reducing exposure—not assuming vaccination offers broad protection. HCV testing and treatment, for example, address an infection linked to liver cancer; antibiotics can eradicate H. pylori in appropriate cases. A clinician can advise which measures apply to a person’s history and circumstances.
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