1. Istituto Zooprofilattico Sperimentale della Sicilia, Barcellona Pozzo di Gotto, Italy
2. National Reference Center for Sheep and Goat Mastitis, Istituto Zooprofilattico Sperimentale della Sardegna, Sassari, Italy
3. Department of Veterinary Sciences, University of Turin, Turin, Italy
4. Department of Food Safety, Nutrition and Veterinary Public Health, Istituto Superiore di Sanità, Rome, Italy
5. Department of Science, Roma Tre University, Rome, Italy