Onur Boyman (IMAGE) University of Zurich Caption “In patients with Long Covid, the complement system no longer returns to its basal state.” Onur Boyman, professor of immunology at University of Zurich Credit Enrique Heer Usage Restrictions none License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.