Christian Happi: Can Africa become a world leader in vaccine development?

Zeinab Badawi speaks to Professor Christian Happi whose ground-breaking research is helping tackle diseases that kill thousands every year. He gave up a career at Harvard University in the US and moved back to Africa where is setting up a world-class laboratory in Nigeria which will have a pandemic early detection system. He believes Africa could become a global centre of knowledge about infectious diseases such as Covid-19. How realistic is his vision?