Dr Alex Awiti, Vice Provost of the Aga Khan University in Kenya, writes that it is estimated that 83 percent of vaccine shots worldwide have gone into the arms of high-and upper-middle income countries. The disparities between wealthier and poorer nations go beyond vaccine access or availability. It is shameful that while poor countries have scrambled for vaccine supplies, operational ineptitude and vaccine hesitancy have left stockpiles of vaccines expiring in countries that cannot afford to waste even a single dose. The world must rally to bridge the gulf between the vaccine haves and have nots. Covid-19 anywhere is a threat to health and economic prosperity everywhere.