Niklas Björkström, Karolinska Institutet (IMAGE) Karolinska Institutet Caption Niklas Björkström, physician, researcher at the Center for Infectious Medicine, Department of Medicine Huddinge, Karolinska Institutet Credit Markus Marcetic Usage Restrictions None License Licensed 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.