Affiliation: | 1. Department of Veterinary Pathology, Universidade Federal do Rio Grande do Sul – UFRGS, Porto Alegre, Brazil;2. Department of Animal Medicine, Universidade Federal do Rio Grande do Sul – UFRGS, Porto Alegre, Brazil;3. Department of Pathology, Botucatu Medical School, Universidade Estadual Paulista – UNESP, Botucatu, Brazil |