This piece is a look at the fightback against COVID 19; the search is on for a safe and effective vaccine against coronavirus. A group of investigators in the UK are about to begin trialing a vaccine using a ChAdOx virus vector. This piece gets into the detail of the trial and how the vaccine might work.

Presented by Joff Lacey with his guest Professor Paul Heath, consultant in pediatric infectious diseases, at St George's Hospital in London. He co-leads the Pediatric Infectious Disease research group and is a director of the vaccines institute also at St George's.