UK investment in Gavi, the Vaccine Alliance (2016-2020) Gavi supports vaccine delivery in 68 of the world's poorest countries reaching 60% of the world's birth cohort. Gavi immunises children against vaccine preventable diseases including measles, rubella, meningitis, cervical cancer, pneumonia and diarrhoea. Gavi has played a significant role in the recent halving of global child mortality. Over the 2016 to 2020, Gavi will fully deliver the UK target to immunise 76 million children and save 1.4 million lives. Gavi targets reaching those in hard to reach areas, the poorest, and the most marginalised. Gavi has a major global market shaping role for vaccines, negotiating lower prices for low-income countries, and incentivising new vaccines such as for Ebola and Malaria.