Department of Vascular Medicine, Academic Medical Center, University of Amsterdam, The Netherlands. Laboratory of Microbiology, Wageningen University and Research Center, Wageningen, The Netherlands. Department of Cellular and Molecular Medicine, Lerner Research Institute Cleveland Clinic, Cleveland, OH. Department of Pediatrics, College of Medicine and Life Sciences, University of Toledo, OH. Department of Internal Medicine and Radboud Center for Infectious Diseases (RCI), Radboud University Medical Center, Nijmegen, The Netherlands. Department of Clinical Pharmacy, Academic Medical Center, University of Amsterdam, The Netherlands. Immunobiology Research Program, Department of Bacteriology and Immunology, University of Helsinki, Finland. Department of Vascular Medicine, Academic Medical Center, University of Amsterdam, The Netherlands m.nieuwdorp@amc.uva.nl. Department of Internal Medicine, VUMC Free University, Amsterdam, The Netherlands. Wallenberg Laboratory, Sahlgrenska Hospital, University of Gothenburg, Sweden.