1. Institute of Molecular Biology, Federal Research Institute for Animal Health, Friedrich-Loeffler-Institut; D-17493; Greifswald; Insel Riems; Germany
2. Institute of Infectology, Federal Research Institute for Animal Health, Friedrich-Loeffler-Institut; D-17493; Greifswald; Insel Riems; Germany
3. Institute of Immunology, Federal Research Institute for Animal Health, Friedrich-Loeffler-Institut; D-17493; Greifswald; Insel Riems; Germany
4. Max von Pettenkofer-Institute and Gene Center; Ludwig-Maximilians-University; D-81377; Munich; Germany