November 1999
GAVI is formed as an initiative between The WHO, UNICEF, the World Bank, and the then newly created Bill & Melinda Gates Foundation.
Sources:
https://www.gatesfoundation.org/ideas/media-center/press-releases/1999/11/global-alliance-for-vaccines-and-immunization.
Foundation.
https://apps.who.int/gb/archive/pdf_files/EB105/eer4.pdf.
World Health Organization, PDF.
Related:
https://www.brighteon.com/3887db57-7604-4a14-838c-2eb9690343f5.
Video.