1 Virology Unit, Department of Biomedical Sciences, Institute of Tropical Medicine, B-2000 Antwerp, Belgium; National Reference Centre for Arboviruses, Department of Clinical Sciences, Institute of Tropical Medicine, B-2000 Antwerp, Belgium; Department of Biomedical Sciences, University of Antwerp, Wilrijk, Belgium. Electronic address: karien@itg.be.
2 Virology Unit, Department of Biomedical Sciences, Institute of Tropical Medicine, B-2000 Antwerp, Belgium; National Reference Centre for Arboviruses, Department of Clinical Sciences, Institute of Tropical Medicine, B-2000 Antwerp, Belgium.
3 National Reference Centre for Arboviruses, Department of Clinical Sciences, Institute of Tropical Medicine, B-2000 Antwerp, Belgium.