The World Health Organization (WHO) says a target of fully vaccinating 10% of all people in Africa by the end of September won't be achieved unless supplies improve.
Only around 3% of Africa's population is fully vaccinated, compared with around 54% in the US and 65% in the UK.
The global Covax vaccine scheme, intended to help poorer countries, has supplied about 37% of these, with most acquired through bilateral deals and donations.
Earlier this year, countries struggled to get supplies via Covax, but the situation improved in July and August.
Supply was partly boosted by wealthier countries donating to Covax - or directly to African nations.
For example, there were pledges made to share surplus supplies at the G7 summit in the UK last June. On 2 September, the WHO said that almost 21 million vaccines had arrived in Africa via Covax in the month of August - an amount equal to the previous four months combined.
Some countries have also received vaccines donated by China, Russia, India, and the UAE.
UN data shows that so far, donations have been pledged amounting to more than 68 million doses to African states and to the African Union (this includes donations via the Covax scheme).
Of these, so far just under 45 million have been delivered.
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