[1] Univ Fed Minas Gerais, Fac Odontol, Dept Clin Patol & Cirurgia Odontol, BR-31270901 Belo Horizonte, MG, Brazil
[2] Univ Fed Minas Gerais, Inst Ciencias Biol, Dept Microbiol, BR-31270901 Belo Horizonte, MG, Brazil
[3] Univ Fed Minas Gerais, Inst Ciencias Biol, Dept Bioquim & Imunol, BR-31270901 Belo Horizonte, MG, Brazil