Covid-19: is it possible to predict how sick someone could get?

Nine months in, and with over 30 million people having been infected with Covid-19, we now know some of the main factors that put people at higher risk of a severe case of the disease, such as age and having other health problems. But there is still a lot to learn about why some people, and not others, become very ill from catching Sars-CoV-2. Nicola Davis takes a look at the researchers attempting to rapidly work out how to predict who is going to get very sick. Help support our independent journalism at theguardian.com/sciencepod