[1] Univ Fed Rio Grande do Sul, Dept Biotecnol, Programa Posgrad Biol Celular & Mol, Porto Alegre, RS, Brazil
[2] Univ Fed Santa Maria, Dept Vet Prevent Med, BR-97119900 Santa Maria, RS, Brazil
[3] Univ Fed Santa Maria, Dept Microbiol & Parasitol, BR-97119900 Santa Maria, RS, Brazil