1. Department of Stomatology, School of Dentistry, University of São Paulo, Av Prof. Lineu Prestes 2227, 05508-000 São Paulo, Brazil
2. Dental School, University of Santo Amaro, R. Prof. Eneas de Siqueia Neto 340, 04829-300 São Paulo, Brazil
3. Laboratory of Virology, Institute of Tropical Medicine of São Paulo, University of São Paulo, v. Dr. Enéas Carvalho de Aguiar 470, 05403-000 São Paulo, Brazil