1. Center of Tropical Medicine, University of Brasilia, Brasília 70904-970, Brazil
2. Escola Superior de Agricultura Luís de Queiroz, Universidade de São Paulo, Piracicaba 13418-900, Brazil
3. Department of Infection Biology, Faculty of Infectious and Tropical Diseases, London School of Hygiene & Tropical Medicine, University of London, London WC1E 7HT, UK
4. Faculty of Health Sciences, University of Brasilia, Brasilia 70910-900, Brazil
5. Oswaldo Cruz Foundation, Evandro Chagas National Institute of Infectology, Rio de Janeiro 21040-360, Brazil