About the Value of Immunization Compendium of Evidence

The Value of Immunization Compendium of Evidence (VoICE) is a searchable database of peer-reviewed, scientific evidence demonstrating the broad benefits of immunization across health, equity, economics, health system strengthening, and other related issues. This resource is designed to provide child health and immunization advocates with evidence-based advocacy messaging on the wide-ranging benefits of immunization.

VoICE is a project of the International Vaccine Access Center (IVAC) at the Johns Hopkins Bloomberg School of Public Health, and is made possible with support from the Bill & Melinda Gates Foundation.



The VoICE Compendium is continually updated with summaries of the latest peer-reviewed research on the broad benefits of vaccines; it currently includes more than 450 Key Evidence data summaries from nearly 300 peer-reviewed sources. VoICE utilizes a robust literature review process to select high-quality evidence. Additional sources come only from credible scientific sources such as the World Health Organization (WHO) or the U.S. Centers for Disease Control and Prevention (CDC).


Featured Issues and Featured Spotlights are short cross-cutting articles that address specific topics of interest to the global health and immunization advocates. These narratives provide a deep dive into a particular topic – such as a specific disease, a health system issue, or a concept relevant to immunization activities.


A Media Library provides free-to-use infographics, social media content, videos, and other documents developed as part of VoICE. All of the materials in the VoICE Media Library are covered by a Creative Commons license, allowing access for anyone to re-use or share these resources for non-commercial purposes.


About the International Vaccine Access Center at Johns Hopkins University, Bloomberg School of Public Health

Founded in 2009, The International Vaccine Access Center (IVAC) at the Johns Hopkins Bloomberg School of Public Health accelerates equitable access to vaccines through the generation, synthesis, and use of evidence to inform decision-making and action.

  • We generate, synthesize, and interpret evidence that supports informed vaccine policy decisions.
  • We provide technical assistance for policy-making that increases vaccine equity and coverage, bolsters new introduction decisions and processes, optimizes vaccine use, and advances sustainable vaccine financing.
  • We strengthen efforts to enable equitable access to vaccines, amplify political will, and measure impact to ensure program accountability and sustainability.

Learn more about IVAC