Tedros Adhanom Ghebreyesus was speaking at a virtual briefing in Geneva.

Dozens of countries have signed up to the global vaccine plan known as COVAX, which was set up by the WHO and the GAVI vaccine group to provide vaccine doses for countries that could not otherwise afford them.

It has so far raised $5 billion, including more than 500 million euros ($600 million) from Germany.

(Reporting by Stephanie Nebehay and Emma Farge in Geneva and Michael Shields in Zurich; Writing by Nick Macfie; Editing by Alex Richardson)