The WHO has decided to review the COVID-19 vaccine candidate officially approved by Russian regulators on Tuesday, saying it would require “a rigorous safety data review”.“We are in close contact with the Russian health authorities and discussions are ongoing with respect to possible WHO pre-qualification of the vaccine,” said Tarik Jasarevic, the United Nations health agency’s spokesman. He made the statement while answering questions during a digital press briefing on Tuesday.”Pre-qualification of any vaccine includes the rigorous review and assessment of all the required safety and efficacy data.”Russia’s Sputnik V vaccine was developed by Moscow’s Gamaleya research institute with help from the Russian defense ministry. It was tested at Moscow’s state medical university.A total of 165 candidate vaccines are being tested around the world, according to a WHO tally. 139 of these are still in pre-clinical evaluation, while 26 have progressed to various phases of human testing. The 6 market leaders have already reached Phase 3.