Gist: UNICEF is one of the largest buyers of vaccines. In 2016, the organization procured 2.5 billion doses spent $757 million to provide 2.5 billion doses of vaccines and provided immunization to nearly 50 per cent of the world’s under-5 children in 100 countries. This information was revealed during the third Immunization Week. Nigeria, Pakistan, and Afghanistan, the three remaining polio-endemic countries, each received more doses of vaccines than any other country. Access to immunization has led to a dramatic decrease in deaths of children under five from vaccine-preventable diseases, and has brought the world closer to eradicating polio, said UN Spokesperson St├ęphane Dujarric.