Coronavirus vaccines remain out of reach in the poorest countries, the head of the World Health Organization (WHO) said on Friday, marking the first anniversary of the COVAX dose-sharing facility.

WHO director-general Tedros Adhanom Ghebreyesus has repeatedly denounced inequities in vaccine distribution and urged wealthier countries to share excess doses to help inoculate health workers in low-income countries.

More than 3.2 million people have died in the pandemic worldwide.

"Nearly 900 million vaccine doses have been administered globally, but over 81percent have gone to high- or upper middle-income countries, while low-income countries have received just 0.3percent," Tedros said in a report about the ACT (Access to COVID-19 Tools) Accelerator set up a year ago.

The European Commission said it had sealed the world's biggest vaccine supply deal, agreeing to buy up to 1.8 billion doses of Pfizer's vaccine for the next few years as a debate rages over access to shots for the world's poorest people.

Its President Ursula Von der Leyen, in a recorded message to the WHO press conference: "The response of too many leaders was 'my country first'. We made a different choice. We knew that we needed to fight this virus not just at home but in all continents and countries, from Asia's megacities to Africa's most remote villages."

French President Emmanuel Macron said that one in six Europeans had been vaccinated, one in five in North America but just one in 100 in Africa.

"It's unacceptable," he said. France will step up vaccine donations to COVAX in the coming months, providing 500,000 shots, including from suppliers other than AstraZeneca, Macron said, urging others to do the same.

(With input from agencies)