1. Department of Internal Medicine, School of Veterinary Medicine and Animal Science, University of São Paulo, Av. Prof. Dr Orlando Marques de Paiva, 87, Cidade Univerditária, São Paulo, Brazil
2. Laboratory of Virology, Institute of Biological Sciences, University of São Paulo, Av. Prof. Lineu Prestes, 1374, Cidade Universitária, São Paulo, Brazil
3. Biological Institute, Av. Conselheiro Rodrigues Alves, 1252, Vila Mariana, São Paulo, Brazil
4. Laboratory of Bovide Virosis, Biological Institute, Av. Conselheiro Rodrigues Alves, 1252, Vila Mariana, São Paulo, Brazil