Only about 3% of Nigeria's population has received a full course of vaccines against Covid - a low rate even compared with other countries in Africa. For South Africa, the figure is 24%.
However, it's emerged that Nigeria has a large stockpile of out-of-date vaccines which has gone unused.
This could be as many as one million doses according to the Reuters news agency.
The health ministry says all expired vaccines have been withdrawn and will be destroyed.
What vaccines has Nigeria been sent?
Nigeria, among other African countries, struggled to access Covid vaccines earlier this year as wealthier nations, which had secured early deals, were given priority by manufacturers.
Many African states were also relying on the Covax scheme, which itself experienced difficulties earlier in the year meeting its commitments to supply vaccines, particularly across Africa.
But in recent weeks, delivery has improved as wealthier countries began releasing stocks they were holding, largely via the Covax system.
Nigeria received 700,000 doses of the AstraZeneca vaccine from the UK in August, and 800,000 from Canada in September, with a further 500,000 coming from France in October.
Around the same time, Nigeria also received four million doses of the Moderna vaccine and 3.6m Pfizer doses from the US.
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