Abuja, Nigeria (CNN)While many African nations are grappling with barely sufficient supplies of Covid-19 vaccines, others are destroying thousands of unused shots. Kenya is just one of the countries that has used up more than 90% of its stock of Oxford-AstraZeneca doses, supplied by vaccine-sharing facility COVAX. The East African nation is just weeks away from joining its sub-Saharan neighbors Botswana, Eswatini, Ghana, Rwanda, Togo and Senegal on the list of African countries which have exhausted their COVAX donations. In stark contrast, South Sudan, which borders Kenya to the south, has announced plans to discard about 59,000 of a total 191,000 doses of the AstraZeneca vaccine it received in donations.