Health officials say they have detected more cases of a mysterious liver disease in. More than 4 in 5 people who have symptoms of COVID-19 the illness caused by the coronavirus get only mildly sickBut if you have ongoing health issues including liver disease the virus may be. Ugw1oaqx Lasym Health agency said late. . Puzzling outbreak of liver disease in kids spreads to EU US. The World Health Organization says at least one death has resulted from a mysterious liver disease outbreak affecting children in Europe and the United States. BERLIN -- The World Health Organization says at least one death has been reported in connection with a mysterious liver disease outbreak affecting children in Europe and the United States.