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HPV Vaccine: Adult Catch-Up
Miss the HPV shot as a teenager? The FDA cleared it through age 45 in 2018, and most adults assume they're too late. The reason they aren't: immunity to HPV is type-by-type, not all-or-nothing. After years of partners you're probably still naive to most of its nine strains, and it can block the ones you haven't caught. In naive adults 24-45 it stopped 88.7% of vaccine-type pre-cancer and warts Castellsague 2011. Whether it's worth it turns on one question about your decade ahead.
Do Β· Course Evidence Moderate Chapter Screening

The shot is a hollow shell of nine HPV strains with no viral DNA inside, so it can't give you HPV; it just trains antibodies against the real virus. Six of the nine drive most cervical, anal, and throat cancers; two more cause about 90% of genital warts. It only blocks strains you haven't caught yet.

It works this late, if you're still naive. That 88.7% figure is for adults who finished the series naive to the strains 1; count people already infected and it falls to about 47%, because it can't rescue strains you carry. At population scale cervical cancer dropped 63% in vaccinated women 2. In men who have sex with men it stopped 75% of vaccine-type anal pre-cancer 3, and a 2024 US cohort saw HPV cancers in vaccinated men roughly halve 4.

What you're preventing isn't rare. Cervical cancer kills over 4,000 US women yearly. Throat cancer is the fastest-rising cancer in middle-aged US men, driven by HPV, peaking in the mid-2030s 5. The catch-up caveat: vaccinating at 35 buys less than at 12, since much of your exposure has already happened. Throat cancer is the exception, with 20-30 years from exposure to diagnosis.

The whole decision is one question: how much new sexual exposure is plausibly ahead of you? Future exposure tilts the math; your history barely does.

The cost trap is age 26. List price runs about $363 a shot, $1,089 uninsured, but most commercial plans cover Gardasil 9 with no copay. ACA preventive coverage is only mandated through 26; past that, payers vary and some want a documented indication, so call your insurer.

The fast payoff lands within weeks of dose three: your odds of new genital warts drop to essentially zero for the two strains behind about 90% of them 1. Over 5-10 years come fewer abnormal Paps and procedures 7. The cancers take 15-30 years to show lower rates 5.

The fine print β€” when to skip it, and what people get wrong

It won't treat what you already have. Warts, an abnormal Pap, a known lesion all still need their own care. And it isn't a substitute for Pap and HPV screening, which catch what it misses 6.

Skip in pregnancy: untested rather than known-harmful, and it waits well. Skip with severe yeast allergy; the vaccine is grown in baker's yeast. Don't redose after a severe reaction. Breastfeeding and mild illness are fine.

Two doses protect less than three in adults, so finishing matters. In HIV-positive adults 27+ the shot failed to prevent new anal infection β€” too much exposure was already behind them 8.

References
  1. 1Castellsague X, Munoz N, Pitisuttithum P, et al. (2011). End-of-study safety, immunogenicity, and efficacy of quadrivalent HPV (types 6, 11, 16, 18) recombinant vaccine in adult women 24-45 years of age. British Journal of Cancer. link
  2. 2Lei J, Ploner A, ElfstrΓΆm KM, et al. (2020). HPV Vaccination and the Risk of Invasive Cervical Cancer. New England Journal of Medicine. link
  3. 3Palefsky JM, Giuliano AR, Goldstone S, et al. (2011). HPV Vaccine against Anal HPV Infection and Anal Intraepithelial Neoplasia. New England Journal of Medicine. link
  4. 4Saxena K, Dawson R, Cyhaniuk A, et al. (2024). Effects of HPV vaccination on the development of HPV-related cancers: A retrospective analysis of a United States-based cohort. Journal of Clinical Oncology. link
  5. 5Damgacioglu H, Sonawane K, Zhu Y, et al. (2022). Long-term impact of HPV vaccination and COVID-19 pandemic on oropharyngeal cancer incidence and burden among men in the USA: A modeling study. The Lancet Regional Health - Americas. link
  6. 6CDC (2024). HPV Vaccine Recommendations. link
  7. 7Falcaro M, CastaΓ±on A, Ndlela B, et al. (2021). The effects of the national HPV vaccination programme in England, UK, on cervical cancer and grade 3 cervical intraepithelial neoplasia incidence: a register-based observational study. The Lancet. link
  8. 8Wilkin TJ, Chen H, Cespedes MS, et al. (2018). A Randomized, Placebo-Controlled Trial of the Quadrivalent Human Papillomavirus Vaccine in Human Immunodeficiency Virus-Infected Adults Aged 27 Years or Older: AIDS Clinical Trials Group Protocol A5298. Clinical Infectious Diseases. link
Related in the handbook (4)
Works well with
  • β€” The shot blocks the virus; screening catches what slips through β€” you want both, not one.
Related
  • β€” The HPV catch-up shot prevents several of the cancers this schedule screens for, so it's worth doing alongside the checks.
  • β€” HPV catch-up through 45 is one of the shots worth fitting into your adult schedule if you missed it young.
  • β€” Another adult vaccine most people assume the age window closed on β€” it didn't, and it blocks six cancers.
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