On December 31, 2020, one year after coronavirus was first detected, the World Health Organisation gave the Pfizer/BioNTech vaccine emergency validation, making it the first to be given such clearance. It was just seven months after the first trials began – a record breaking length of time.  Other vaccines followed. AstraZeneca, Moderna, Sinopharm, Sputnik V and Johnson & Johnson are now common names for a range of jabs that are being deployed in different regions of the world.  Hundreds of millions of doses have been administered worldwide. But with over seven and a half billion people on Earth and with most types requiring two doses, we still have a long way to go.  On this week's Beyond the Headlines, host Suhail Akram looks at how we vaccinate the world.