The year 2020 ended with some relief that vaccines for Covid-19 were available at last. But the pandemic is not over yet and new, more infectious strains of the Sars-CoV-2 coronavirus are appearing. Apart from the challenge of making the vaccines available globally, questions remain about how effective they will prove in stopping the spread of the virus, and which ones work best. On this week's Beyond the Headlines, Suhail Akram looks at the next front in the battle against Covid-19.
