Affiliation: | 1. Department of Microbiology and Parasitology, Federal University of Pelotas - UFPel, POB 354, 96010-900, Pelotas, Rio Grande do Sul, Brazil 2. Department of Animal Biology, University of Campinas - UNICAMP, POB 6109, 13083-970, Campinas, S?o Paulo, Brazil 3. Regional Diagnostic Laboratory of the College of Veterinary – UFPel, 96010-900, Pelotas, Rio Grande do Sul, Brazil
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