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Covid-19 is a respiratory virus that can seriously damage the lungs of the worst-affected patients - but it can also cause clots all over the body. James Gallagher heard from Professor Jeffrey Laurence, a haematologist at Weill Cornell Medicine, and Beverley Hunt, a professor of thrombosis and haemostasis at King's College London, about how the virus seems to make people's blood much 'stickier'. (Images: Viral infection of coronavirus - 3D illustration Credit: Getty Images)