1. Gonçalo Moniz Research Centre Oswaldo Cruz Foundation Salvador Brazil
2. Department of Tropical Medicine Tulane University School of Public Health and Tropical Medicine New Orleans Louisiana USA
3. Centre for Virology Research, Ribeirao Preto Medical School University of Sao Paulo Ribeirao Preto Brazil
4. Centre for Zoonoses Control Salvador Municipal Department of Health R. Mocambo, S/N SalvadorBahia Brazil
5. Department of Biomedicine Bahiana School of Medicine and Public Health Salvador Brazil
6. School of Medicine Federal University of Bahia Salvador Brazil
7. Yale School of Public Health Yale University New Haven Connecticut USA