1. Virology Research Center, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil
2. Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston, Texas, USA
3. Department of Cell Biology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil
4. Department of Biochemistry and Immunology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil
5. Department of Biochemistry and Tissue Biology, Institute of Biology, State University of Campinas, Campinas, Brazil