1. Istituto Zooprofilattico Sperimentale della Lombardia ed Emilia Romagna (IZSLER), Brescia, Italy
2. Department of Animal Medicine, Production and Health, Padua University, Legnaro, Italy
3. Istituto Zooprofilattico Sperimentale della Lombardia ed Emilia Romagna, Forlì, Italy
4. CESAC-Centre de Sanitat Avícola de Catalunya i Aragó, Reus, Spain
5. Centre de Recerca en Sanitat Animal, CReSA, UAB-IRTA, Barcelona, Spain