Yes — Gardasil 9 is safe and is one of the best-studied vaccines in use. It's monitored continuously, and the main reactions are mild and short-lived, like a sore arm. What it does matters more: given at the recommended ages, it can prevent more than 90% of HPV-caused cancers ACS.
of HPV-attributable cancers
| Item | Value |
|---|---|
| Currently infected | ~42 million |
| New infections / yr | ~13 million |
| Clear within 2 years | ~90% |
| Vaccine prevents | >90% — of HPV-attributable cancers |
Why the HPV vaccine matters in the first place
HPV is the most common sexually transmitted infection, so common that most sexually active people encounter it at some point CDC. It spreads most often during vaginal or anal sex, but penetration isn't required — close skin-to-skin contact of the genital area during sex is enough. It also passes through oral sex, infecting the mouth and throat, which is the route behind HPV-related throat cancers.
Low-risk types (6 and 11) cause genital warts, while high-risk types (16, 18, and others) cause cancers. The wart types do not cause cancer. They're two separate problems. In most cases the infection clears on its own; about 9 out of 10 HPV infections go away within two years with no health problems. Vaccination is aimed at the smaller fraction that doesn't clear and progresses toward precancer.
How to prevent HPV — and how well each method works
There's no single perfect shield against HPV, but the layers stack well. Three approaches do the heavy lifting: vaccination (the strongest, and the only one that prevents infection outright), condoms (partial protection), and cervical screening, which catches trouble early rather than preventing it.
Vaccination: the strongest prevention
The HPV vaccine used in the US today is Gardasil 9, which protects against nine types: 6, 11, 16, 18, 31, 33, 45, 52, and 58 CDC Pink Book. Types 16 and 18 alone cause about 66% of cervical cancers; the five additional high-risk types it added (31, 33, 45, 52, 58) account for roughly another 15%; and types 6 and 11 cause more than 90% of genital warts. Gardasil 9 is about 98% effective against the precancers caused by HPV 16 and 18.
The older shots covered less ground. The original quadrivalent Gardasil hit four types (6, 11, 16, 18) and Cervarix covered two (16, 18). Since 2016 only the 9-valent version has been distributed in the US, so today's shot protects against more cancer-causing types than what was available before.
The vaccine is prevention, not treatment. Gardasil 9 protects against future infection, but it won't clear an HPV infection or warts you already have. It works best given before someone is sexually active, and vaccinated people still need cervical screening down the road.
Condoms and their limits
Condoms cut HPV transmission but give only partial protection, because HPV can infect skin a condom doesn't cover — the base of the genitals, the scrotum, the vulva. The virus lives on skin, not just in fluids, so contact with an uncovered area can still pass it. Use condoms — they also protect against infections condoms cover well — but don't treat them as a substitute for the vaccine.
Cervical screening: catching trouble early
Screening doesn't prevent HPV, but it finds precancer before it becomes cancer, which is part of why cervical cancer is one of the most preventable cancers. Current guidance starts cervical screening at age 25 with a primary HPV test every 5 years as the preferred approach, rather than a yearly Pap ACS. The longer interval isn't cutting corners: most HPV clears within two years on its own, and HPV testing catches more real precancer with fewer visits. For more on what these tests look for, see our guide to hpv testing.
Does testing help prevent HPV?
Testing is part of prevention, but it works differently than for other STIs, and the rules are specific. There's no routine HPV test for men — HPV tests aren't recommended to screen men, adolescents, or women under age 30. There's also no swab that diagnoses warts; HPV testing isn't used to confirm or manage genital warts. If you're wondering whether a standard panel includes it, read does hpv show up on an std test?.
For anal screening, the CDC's 2021 guidance found the data insufficient to recommend routine anal cytology, even for men who have sex with men or people with HIV. That predates the 2022 ANCHOR trial, which showed that treating high-grade anal lesions reduced anal cancer in people with HIV — so some specialty groups now suggest periodic anal Pap for high-risk people where referral for high-resolution anoscopy exists CDC STI Tx. It's not a blanket CDC recommendation. If you've had a possible exposure and want to know the right interval, see when to test after exposure.
Comparing your prevention options
| Method | What it does | How well it works |
|---|---|---|
| Gardasil 9 vaccine | Prevents future infection with 9 HPV types | Can prevent >90% of HPV-caused cancers; ~98% against HPV 16/18 precancers |
| Condoms | Reduce skin-to-skin and fluid contact | Partial only — HPV infects uncovered skin |
| Cervical screening | Finds precancer early, doesn't prevent infection | Highly effective at preventing cervical cancer when done on schedule |
What HPV can do if it isn't prevented
The cancer toll reaches well beyond the cervix. HPV causes virtually all cervical cancer, over 90% of anal cancers, and about 70% of throat (oropharyngeal) cancers, and oropharyngeal cancer has now overtaken cervical as the most common HPV-related cancer in the US NCI. Oropharyngeal cancer affects the back of the throat, base of the tongue, and tonsils, and it often shows up later because the area is hard to self-examine. The throat-cancer route has no screening test, so the shot is the only real defense against it, which is why vaccinating regardless of gender makes sense.
A common worry is fertility. HPV itself isn't a typical cause of infertility, but the treatments for advanced cervical precancer or cancer can affect it, which is another reason early screening and vaccination matter. We unpack this in does hpv cause infertility?.
Putting it together
The practical plan is simple. Get vaccinated if you're in the eligible age range, use condoms knowing they're a partial layer, and keep up with cervical screening on the recommended schedule even after you're vaccinated. The vaccine handles the cancers the shot covers; screening backstops the types it doesn't and any infection that predates the shot.
When to see a clinician
- You're in the eligible age range and haven't been vaccinated, or you're unsure whether you finished the series.
- You notice new genital growths or warts — these need a clinical look, not an HPV test, since the test doesn't diagnose them.
- You're due for cervical screening, or it's been longer than your recommended interval.
- You're a person with HIV or another high-risk situation and want to discuss anal screening with a specialist.
- You want to confirm your STI status overall — you can get tested and ask which screens apply to you.