# Switch every country to single-dose HPV vaccination and add catch-up to age 26

Source: https://onco.cc/ideas/idea-prev-hpv-single-dose-switch-catchup/  
OnCo record `idea-prev-hpv-single-dose-switch-catchup` (Idea). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

One dose of HPV vaccine protects as well as two or three. Halving the doses frees supply to vaccinate far more girls, boys and young adults.

## Summary

One dose of HPV vaccine protects as well as two or three, so this idea coordinates a switch to single-dose schedules in every country and directs the freed supply to gender-neutral and catch-up vaccination to age 26. KEN SHE and other trials showed single-dose efficacy and WHO recommends one- or two-dose schedules, yet many countries retain two doses; in low-income countries supply and delivery cost rather than hesitancy are the main limits, and a single dose halves both. Progress would be measured by coverage in Gavi-supported countries and HPV16/18 prevalence in 18-year-olds. The test is country-level monitoring as the switch is implemented. Being tested at scale, it addresses the bottlenecks Prevention we already have is not deployed and Most of the world has almost no cancer care.

## Fields

- Kind: Idea
- Last checked: 2026-09-08
- Hypothesis: A single-dose switch increases full coverage in Gavi-supported countries by at least 20 percentage points within three years and reduces HPV16/18 prevalence in 18-year-olds by at least half within a decade.
- Rationale: Supply and delivery cost, not hesitancy, are the main limits in low-income countries; single dose halves both.
- Proposed test: Country-level coverage and prevalence monitoring as the switch is implemented.
- Maturity: being-tested-at-scale
- Actor: policy

## Sources

- WHO cervical cancer elimination initiative: https://www.who.int/initiatives/cervical-cancer-elimination-initiative
- Gavi: https://www.gavi.org

## Connected records

- cancers: [Cervical cancer](https://onco.cc/cancers/cervical/), [Head and neck squamous cell carcinoma](https://onco.cc/cancers/head-and-neck/)
- fronts: [Prevention & Risk](https://onco.cc/fronts/prevention/)
- technologies: [HPV & HBV vaccination](https://onco.cc/technologies/hpv-vaccine/)
- institutions: [International Agency for Research on Cancer (IARC / WHO)](https://onco.cc/institutions/iarc/)
- bottlenecks: [Most of the world has almost no cancer care](https://onco.cc/bottlenecks/b-global-access/), [Prevention we already have is not deployed](https://onco.cc/bottlenecks/b-prevention-adoption/)
- key papers: [Swedish registry study: HPV vaccination almost eliminates cervical cancer when given before 17](https://onco.cc/key-papers/paper-hpv-vaccine-sweden-nejm-2020/)
- roadmaps: [Cancer prevention roadmap: tobacco control and vaccines → biomarker-guided chemoprevention → interception in carriers](https://onco.cc/roadmaps/prevention-roadmap/)

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