Covid-19: is seven days in isolation enough?

How long should you remain in isolation if you have symptoms of Covid-19? It depends on who you ask. The UK government guidelines recommend seven days from the onset of symptoms, whereas the World Health Organization advises 14. To get to the bottom of this apparent disparity, Nicola Davis discusses viral shedding with Dr Charlotte Houldcroft, and asks what the evidence currently tells us about how long we stay infectious for. Help support our independent journalism at theguardian.com/sciencepod