How fast is progress around the world?

More than nine billion doses of coronavirus vaccines have been administered, in at least 197 countries worldwide.

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However, there are vast differences in the pace of progress in different parts of the world.

Some countries have secured and delivered doses to a large proportion of their population - but others are some way behind.

Who is receiving vaccines?

With an aim to give doses to nearly every adult around the world, this is the largest vaccination programme in history.

Overall, China and India have administered the highest number of doses, with nearly three billion and 1.6 billion respectively. The US is third, with more than 520 million.

Many poorer countries are relying on deliveries from Covax, a scheme led by Gavi, the Vaccine Alliance, together with the WHO and the Coalition for Epidemic Preparedness Innovations (CEPI), which is trying to ensure everyone in the world has access to a Covid vaccine.

Covax had planned to deliver about two billion vaccine doses globally by the end of the year, but downgraded its supply forecast as a the result of global export bans, production challenges and slow regulatory approval processes.

The scheme has now distributed more than one billion vaccines.

Which vaccines are in use?

The vaccine produced by Pfizer and BioNTech was the first approved by the WHO, followed by several others.

The Oxford-AstraZeneca vaccine is now the most widely used around the globe.

Unlike Pfizer's jab - which has to be kept at an extremely cold temperature (-70C) - the Oxford vaccine can be stored in a normal fridge, which makes it easier to distribute.

Most governments have started with doses for the over-60s, health workers and people who are clinically vulnerable. After priority groups have been vaccinated, there is a wider rollout among younger age groups.