The Vaccine Year Ahead

What might the wonderful world of vaccines have in store for us in 2021? And what are the challenges that lie ahead in getting them to the billions of people who need them across the world?Tim Harford is joined this week by Dr Anna Blakney, Bioengineer at Imperial College London, Dr Nick Jackson from the Coalition for Epidemic Preparedness Innovations and Natasha Loder, Health Policy Editor at the Economist.