Illustration (IMAGE) University of Bonn Caption When T cells (blue-white sphere) fill up with energy in the form of ketone bodies (blue), they can fight viruses more effectively. Credit © Chantal Wientjens, AG Prof. Wilhelm / University of Bonn Usage Restrictions Please use this image only in connection with the press release. 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.