[1] Univ Fed Santa Maria, DMVP, PPGMV, PPGCF,CCR, BR-97105900 Santa Maria, RS, Brazil
[2] Inst Fed Farroupilha IFFar, Lab Microbiol & Doencas Infecciosas, Frederico Westphalen, RS, Brazil
[3] Univ Fed Santa Maria, Dept Fisiol & Farmacol, Santa Maria, RS, Brazil
[4] Univ Estadual Paulista Julio Mesquita Filho UNESP, Fac Med Vet & Zootecnia, Dept Higiene Vet & Saude Publ, Botucatu, SP, Brazil
[5] Univ Fed Vale Sao Francisco UNIVASF, Petrolina, PE, Brazil