[1] Univ Fed Minas Gerais, Fac Med, Lab Res Bacteriol, BR-30130100 Belo Horizonte, MG, Brazil
[2] Univ Fed Minas Gerais, Inst Ciencias Biol, Dept Microbiol, BR-30130100 Belo Horizonte, MG, Brazil
[3] Univ Fed Minas Gerais, Fac Med, Dept Pathol, BR-30130100 Belo Horizonte, MG, Brazil
[4] Univ Fed Minas Gerais, Univ Hosp, Endoscopy Serv, BR-30130100 Belo Horizonte, MG, Brazil
[5] Fundacao Oswaldo Cruz FIOCRUZ MINAS, Ctr Pesquisa Rene Rachou, Lab Imunol Celular & Mol, Belo Horizonte, MG, Brazil