The World Health Organization (WHO) on Friday announced the signing of an advance purchase agreement securing up to 40 million doses of the Pfizer-BioNTech COVID vaccine, under the UN-led COVAX equitable vaccine supply programme. The World Health Organization (WHO) on Friday announced the signing of an advance purchase agreement securing up to 40 million doses of the Pfizer-BioNTech COVID vaccine, under the UN-led COVAX equitable vaccine supply programme. Read MoreUN News – Health