L. Revolledo Department of Pathology, College of Veterinary Medicine, University of São Paulo
Av. Prof. Orlando Marqués de Paiva 87, São Paulo, CEP 05508-270 Brazil
A.J.P. Ferreira Department of Pathology, College of Veterinary Medicine, University of São Paulo
Av. Prof. Orlando Marqués de Paiva 87, São Paulo, CEP 05508-270 Brazil