In the next week, 12 to 15-year-olds in England will begin receiving their vaccine invitations, and booster jabs for over-50s are expected to be announced soon. Today's Justin Webb and Mishal Husain put listeners' questions about the latest stage of the Covid-19 vaccination programme to Dr Liz Whittaker, infectious disease lead at the Royal College of Paediatrics and Child Health, and Professor Peter Openshaw, immunologist at Imperial College London & member of the UK Vaccine Network. (Image: 14 year old receives his first dose of the vaccine in Dublin, Credit: Damien Storan/PA Wire)