1. Department of Biochemistry and Cell Biology, Faculty of Veterinary Medicine & Institute of Biomembranes; Utrecht University; Yalelaan 2 3584 CM Utrecht The Netherlands
2. Department of Infectious Diseases and Immunology, Virology Division, Faculty of Veterinary Medicine; Utrecht University; 3584 CL Utrecht The Netherlands
3. Department of Medical Microbiology and Infectious Diseases; Erasmus University Medical Center; 3015 GD Rotterdam The Netherlands