1. Complex Virology Unit, Istituto Zooprofilattico Sperimentale Lazio e Toscana “M. Aleandri”, Rome, Italy
2. Department of Food Safety, Nutrition and Veterinary Public Health, Istituto Superiore di Sanità, Rome, Italy
3. Research and International Cooperation Office, Istituto Zooprofilattico Sperimentale delle Venezie, Legnaro, Italy
4. Center for Animal Research and Welfare, Istituto Superiore di Sanità, Rome, Italy