1. Department of Molecular MedicineUniversity of Padova IT-35121 Padova Italy
2. Department of MicrobiologyPublic Health Agency of Sweden SE-171 82 Solna Sweden
3. Department of Laboratory MedicineKarolinska University Hospital and KI SE-14186 Huddinge Stockholm Sweden
4. Institute for Virology, FB10-Veterinary MedicineJustus Liebig University Giessen DE-35392 Giessen Germany
5. National Veterinary Institute SE-756 51 Uppsala Sweden
6. Department of Infection Biology, Institute of Infection and Global HealthUniversity of Liverpool L3 5RF Liverpool UK
7. Viral Special Pathogens Branch, Division of High-Consequence Pathogens and Pathology, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention 30333 Atlanta GA USA