1. Immunogenetics Laboratory, Butantan Institute, Avenida Vital Brasil, 1500, São Paulo 05503-900, Brazil
2. Department of Immunology, Institute of Biomedical Sciences, Universidade de São Paulo, São Paulo 05508-900, Brazil
3. União Educacional do Norte, Rio Branco 69915-901, Brazil
4. Diagnostics Section, Pasteur Institute, Avenida Paulista, 393, São Paulo 01311-000, Brazil