蜜芽传媒

Early trials show a coronavirus vaccine developed by the University of Oxford appears safe and trains the immune system. But it's still too soon to know if it will be enough to offer protection and larger trials are now taking place. We'll get your questions answered by our health correspondent and one of our regular experts, Dr Eleanor Murray from Boston University. You can send your questions on WhatsApp +447730751925 or tweet us @bbcworldservice.

Also, we speak to the mother of Elijah McClain, a 23-year-old black man who was killed after an encounter with police in Colorado last year. He had been put in a chokehold and injected with ketamine. No-one was punished over what happened. Following the outcry over the killing of George Floyd, a petition of more than 2 million signatures has led to the state of Colorado re-examining the Elijah McClain case. His mum, Sheneen McClain, tells us about what happened to him.

Picture: An experimental vaccine is administered in Soweto, South Africa, in a separate vaccine trial (Photo by Luca Sola / AFP via Getty Images)