Pan American Health Organization, Funda??o Nacional de Sa?de (Ministry of Health, Brazil), and CNPq (Brazil); Funda??o Oswaldo Cruz. Instituto Oswaldo Cruz. Rio de Janeiro, RJ, Brazil.; Acambis. Cambridge, Massachusetts.; Instituto Adolpho Lutz. S?o Paulo, SP, Brazil.; Acambis. Cambridge, Massachusetts.; Funda??o Oswaldo Cruz. Instituto Oswaldo Cruz. Rio de Janeiro, RJ, Brazil.; Minist?rio da Sa?de. Funda??o Na...