1 1 Department of Microbiology and Immunology, KU Leuven, University of Leuven, Leuven, Belgium.2 Department of Nephrology and Renal Transplantation, University Hospitals Leuven, Leuven, Belgium.3 Department of Imaging and Pathology, KU Leuven, University of Leuven, Leuven, Belgium.4 Department of Pathology, University Hospitals Leuven, Leuven, Belgium.