Researchers from Imperial College London, who looked at clinical data on Covid-19 symptoms from 190 countries, found that it varied widely between countries and with underlying medical conditions. In this first-of-its-kind study to explore symptoms among those who test positive for COVID-19 by geolocation and underlying chronic disease, they found that the symptoms of SARS CoV-2 infection, including the initial trifecta of cough, fever, and loss of smell, varied by both country and the presence of underlying health conditions like asthma and diabetes.