[Comment] Vaccine impact in Gavi-supported countries: balancing evidence with policy needs

Vaccines remain one of the most impactful and cost-effective public health interventions. Decades of evidence from randomised controlled trials and epidemiological studies have shown the impact of vaccines on population health following the introduction and scale-up of immunisation programmes.1 As the incidence of previously debilitating vaccine-preventable childhood diseases diminishes due to vaccination efforts, the perceived importance of immunisation could become less evident to the public. Amid rising vaccine hesitancy and the spread of misinformation, it is increasingly important to continue demonstrating the tangible impact of vaccines globally.