How did vaccines come to be and how have they changed over time? In today's episode, Naomi Stewart speaks to historian Dr Gareth Millward from the University of Warwick, on the history of vaccines and how vaccination programmes have evolved in the 20th century. Professor Liam Smeeth from the London School of Hygiene & Tropical Medicine then walks us through the vaccine landscape at the turn of the 21st century, and public perceptions and attitudes towards vaccination in a COVID-19 world.