1. Environment
Department, Istituto Superiore di Sanità, Viale Regina Elena
299, I-00161 Rome, Italy
2. Department of Veterinary Medicine
and Animal Production, University of Naples Federico II, Via F. Delpino, 1, I-80137 Naples, Italy
3. Campania Region, Regional Veterinary Services, Centro Direzionale di
Napoli, Isola C3, I-80141 Naples, Italy