1. Department of Veterinary Pathology, Faculty of Agricultural and Veterinary Sciences, São Paulo State University (UNESP), São Paulo, Brazil
2. Department of Genetics, Evolution and Bioagents, Institute of Biology, State University of Campinas (UNICAMP), São Paulo, Brazil
3. Biological Institute, Advanced Center for Technological Research of Poultry Agribusiness, São Paulo, Brazil
4. Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, PA, USA