Taste and smell loss are thought to be two of the most common symptoms of coronavirus, but some of the least understood, persisting long after the virus has gone.

Scientists all over the world are racing to find out why Covid-19 is attacking these senses, and what this might teach us about the virus and how to track it – we hear about the latest theories from Turkey-based research scientist Maria Veldhuizen from The Global Consortium for Chemosensory Research.

We hear how smell is vital to the way we perceive flavour, but that it’s also important in other ways. Dr Rachel Herz, a neuroscientist and researcher on the psychology of smell at Brown University and Boston College in the US, explains that long-term smell loss is linked to depression because of the way the sense is plugged into the part of our brain that processes emotions and memories.

But there is some hope - we speak to Chrissi Kelly, from the charity Abscent, who tells us how it’s possible to train your nose to smell again.

Producer: Simon Tulett

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(Picture: A woman staring at an apple on a plate. Credit: Getty Images/BBC)