1. Post-graduate Programme in Animal Science, Universidade Paranaense, Umuarama, Paraná, Brazil
2. Laboratory of Animal Virology, Department of Veterinary Preventive Medicine, Universidade Estadual de Londrina, Londrina, Paraná, Brazil
3. Cruzeiro do Sul University, São Paulo, Brazil
4. Department of Biological and Environmental Sciences, São Paulo State University (UNESP), São Paulo, Brazil