[1] Univ Fed Pelotas, Fac Vet, Dept Clin Vet, Pelotas, RS, Brazil
[2] Univ Fed Rio Grande do Sul, Porto Alegre, RS, Brazil
[3] Univ Fed Pelotas, Fac Vet, Setor Micol, Lab Doencas Infecciosas, Pelotas, RS, Brazil
[4] Univ Fed Pelotas, Fac Vet, Dept Vet Prevent, Pelotas, RS, Brazil
[5] Univ Fed Pelotas, Fac Vet, Dept Anat Patol, Pelotas, RS, Brazil