The South African president, Cyril Ramaphosa, has condemned so-called vaccine nationalism by the world's wealthiest countries.
Addressing the World Economic Forum online, he said some governments had ordered far more coronavirus vaccines than they needed.
Without naming any country, he appealed to them to release surplus stocks so that others could benefit.
Last week, the World Health Organization said unequal access risked becoming a catastrophic moral failure.
South Africa - which is the worst-hit country on the continent - is yet to receive any vaccines.
It hopes to receive its first million doses of the AstraZeneca jab from India later this month.
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