Tedros Adhanom Ghebreyesus said that 189 countries were participating in the programme.
The World Health Organization said on Friday nearly 1 billion doses of leading vaccine candidates had been secured as part of the COVAX programme to provide vaccines for low- and middle-income countries.
Tedros Adhanom Ghebreyesus, WHO director-general, told a Geneva news conference on Friday that 189 countries were participating in the programme.
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