1 Laboratory of Clinical and Epidemiological Virology, KU Leuven, 3000 Leuven, Belgium.
2 Laboratory of Bacteriology, KU Leuven, 3000 Leuven, Belgium.
3 Department of Microbiology, Immunology and Transplantation, Rega Institute of Medical Research and Laboratory for Clinical Infectious and Inflammatory Disorders, Department of Microbiology, Immunology and Transplantation, KU Leuven, 3000 Leuven, Belgium.