作者单位：Department of Veterinary Public Health and Animal Pathology, Faculty of Veterinary Medicine, Bologna University, Bologna, Italy[1]Section of Microbiology, Department of Molecular Biology, Siena University School of Medicine, Siena, Italy[2]Department of Clinical Sciences “L. Sacco”, Section of Infectious Diseases, University of Milan, Milan, Italy[3]Epidemiology Unit, Department of Infectious Parasitic and Immunomediate Diseases, Istituto Superiore di Sanità, Rome, Italy[4]
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