1. Department of Microbiology and Immunology, Institute of Biosciences of Botucatu, São Paulo State University (UNESP), 18618-689 Botucatu, SP, Brazil
2. Department of Pathology, Botucatu Medical School, 18618-970 Botucatu, SP, Brazil
3. Laboratory of Flow Cytometry, Amaral Carvalho Foundation, 17210-120 Jaú, SP, Brazil