In this programme Dr John Wright and doctors at the Bradford Royal Infirmary are recruiting Covid-19 patients into the largest study of its kind: it's a race against time in the search for possible treatments for those made gravely ill by the virus and people are all too willing to help. John Wright has been recording on the wards for BBC Radio 4 – starting on March 16th, the day the Prime Minister gave his first televised address about the danger of Covid-19. This is week four of his diaries, recorded as the number of cases starts to increase and the pressures on the frontline team intensify. These recordings with frontline NHS staff at all levels, take you behind the scenes on the wards as they plan for what is to come and then cope as the patients arrive. They let us share in the pressures, personal and professional, and in the decisions being made in the face of this unprecedented threat. Professor John Wright is helping Bradford Royal Infirmary to get ready for Covid-19. He’s looked after patients all over the world – cholera and HIV in Southern Africa, Ebola in Sierra Leone. He thinks it’s important we should all know what we are facing. Presented by Winifred Robinson Produced by Sue Mitchell Sound Production by Richard Hannaford