1. Department of Veterinary Hygiene and Public Health; UNESP-São Paulo State University; Botucatu SP Brazil
2. Institute of Agricultural Biology and Biotechnology; National Research Council; Lodi Italy
3. Institute of Sciences of Food Production; National Research Council; Milan Italy
4. Department of Preventive Veterinary Medicine; Federal University of Santa Maria; Santa Maria RS Brazil
5. Federal University of São Francisco Valley; PE Brazil
6. Department of Applied Microbiology; Institute of Microbiology; Faculty of Biology; University of Warsaw; Warsaw Poland