Press Release - The Vaccine Investment Strategy (VIS) Steering Committee provides guidance to Gavi's evidence-based process to identify new and under-used vaccines of the highest importance to Gavi-supported countries and with the greatest need for financial support for inclusion into Gavi's future portfolio. Prof Rees is an expert in vaccine implementation and delivery, vaccine research and development and regulatory science, and infectious disease epidemiology. Marta Tufet, the Head of Policy at Gavi: "It is a