Best Bets Quiz - Answer A

Oops!

The correct answer is actually C: A colored bracelet used to signal vaccination status.

This innovation shows how behavioral design can strengthen health systems and improve immunization coverage. By using colored bracelets to mark timely vaccination status, it motivates other caregivers to vaccinate their children—creating a positive ripple effect in the community.

Since 2023, IPA has been working with Sierra Leone’s Ministry of Health to expand this approach to 245 government clinics across eight districts and to integrate the bracelets by delivering them through the same system that distributes vaccines nationwide. A randomized evaluation is also underway to test which bracelet signals are most effective at reducing second-year-of-life dropouts and supporting uptake of new vaccines like the malaria vaccine.

Beyond bracelets, IPA continues to generate evidence on effective ways to increase childhood immunization in low- and middle-income countries, including cash incentives, mobile reminders, and community information campaigns. Vaccination against preventable diseases remains one of the most cost-effective ways to reduce child mortality.

Learn more about IPA’s work in this area on our Health & Nutrition page, and learn more about IPA's Best Bets here.