1. Division of Parasitic Diseases, M.S.-F/13; National Center for Infectious Diseases, Centers for Disease Control and Prevention; 4770 Buford Highway NE Atlanta GA 30341-3724
2. Division of Parasitic Diseases, M.S.-F/13; Centers for Disease Control and Prevention; 4770 Buford Highway NE 30341-3724 Atlanta GA
3. Faculdade de Ciências Médicas; Universidade do Estado do Rio de Janeiro and Hospital Evandro Chagas, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro; Rio de Janeiro Brazil
4. Department of Physiology; Morehouse School of Medicine; Atlanta Ga
5. Department of Pathology; Emory University and Grady Memorial Hospital; Atlanta Ga