The Joint Committee on Vaccines and Immunisation (JCVI) is recommending that a third jab be offered to people with weakened immune systems but the programme and rollout are different to the Covid vaccine boosters expected to be discussed by the JCVI later on Thursday. Shivani Dave speaks to professor of immunology and infectious disease at the University of Edinburgh, Eleanor Riley, and the Guardian science correspondent, Nicola Davis, about the distinctions between booster jabs and third jabs Coronavirus – latest updates. Help support our independent journalism at theguardian.com/sciencepod