These are the challenges to making a coronavirus vaccine

Hundreds of countries, companies and organisations are working together around the world in the hunt for a vaccine to solve the COVID-19 pandemic. We hear from Dr Seth Barkley (CEO, GAVI), Stéphane Bancel‎ (CEO, Moderna Theraputics) and Paul Stoffels (Chief Science Officer, Johnson & Johnson) about the challenges being faced. All were speaking as part of the World Economic Forum's COVID Action Platform.