WHO director-general Tedros Adhanom Ghebreyesus said the latest batch of promising results from final-phase candidate vaccine trials showed there was light at the end of the "long dark tunnel" of the coronavirus pandemic.
But he said the world had to ensure they were distributed fairly across the globe.
"With the latest positive news from vaccine trials, the light at the end of this long dark tunnel is growing brighter. There is now real hope that vaccines in combination with other tried and tested public health measures, will help to end the pandemic," said Tedros.
The WHO says that distribution of the vaccine worldwide will cost USD 4.3 bln.
