In this episode, Prof Mark Smales (Kent) explains how scientists currently test for Covid, and looks at two alternative forms of testing that are in the pipeline. He is joined by Dr Javier Andreu Perez (Essex) and Prof Carl Philpott (UEA). Javier is developing an app that analyses a patient’s cough, and Carl looks at smell loss, and explains why it has now been formally included in the WHO’s list of official symptoms for Covid-19.