[1] Univ Sao Paulo, Fac Med Ribeirao Preto, Dept Biol Celular & Mol & Bioagentes Patogen, Ribeirao Preto, Brazil
[2] Univ Fed Rio Grande do Sul, Ctr Biotecnol, Programa Posgrad Biol Celular & Mol, Porto Alegre, Brazil
[3] Penn State Coll Med, Dept Pathol & Lab Med, Hershey, PA 17033 USA
[4] Penn State Coll Med, Dept Microbiol & Immunol, Hershey, PA 17033 USA