1. Istituto Zooprofilattico Sperimentale delle Venezie, 35020 Legnaro, Italy
2. Department of Animal Medicine, Production and Health, University of Padova, 35020 Legnaro, Italy
3. Centre for Environment, Fisheries and Aquaculture Science, Weymouth, Dorset DT4 8UB, UK
4. Department of Aquatic Animal Health and Welfare, Norwegian Veterinary Institute, 1433 Ås, Norway
5. Istituto Zooprofilattico Sperimentale dell’Abruzzo e del Molise, 64100 Teramo, Italy
6. Istituto Zooprofilattico Sperimentale dell’Umbria e delle Marche “Togo Rosati”, 06126 Perugia, Italy
7. Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d’Aosta, 10154 Torino, Italy