1. Laboratory of Veterinary Bacteriology Faculty of Veterinary Medicine Federal University of Rio Grande do Sul Porto Alegre, Rio Grande do Sul Brazil
2. Veterinary Clinical HospitalFederal University of Rio Grande do Sul Porto Alegre, Rio Grande do Sul Brazil
3. Laboratory of Veterinary Preventive Medicine Federal University of Rio Grande do Sul Porto Alegre, Rio Grande do Sul Brazil
4. Center of Biotechnology Federal University of Rio Grande do Sul Porto Alegre, Rio Grande do Sul Brazil