1. Division of Infectious Diseases and Global Medicine, Department of Medicine, College of Medicine, University of Florida , Gainesville, Florida , USA
2. Emerging Pathogens Institute, University of Florida , Gainesville, Florida , USA
3. Division of Infectious Diseases, Department of Medicine, School of Medicine, University of Maryland , Baltimore, Maryland , USA
4. Division of Intramural Research, National Institute of Allergy and Infectious Diseases , Bethesda, Maryland , USA
5. Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases , Bethesda, Maryland , USA