Russia’s approval of a vaccine against the new coronavirus after less than two months of human testing has caused interest and concern around the world. Russian officials said on Wednesday that the first supplies of the vaccine would be ready for some medical workers within two weeks. They also rejected safety concerns about the vaccine, calling them “groundless." WHO spokesman Tarik Jaserevic talked to reporters in Geneva about clinical tests and what pre-qualification means. He said: “Pre-qualification of any vaccine includes the rigorous review and assessment of all required safety and efficacy data.”