1. Center for Vaccine Development and Global Health, University of Maryland School of Medicine, Baltimore, Maryland, USA
2. Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland, USA
3. Department of Pathology, University of Maryland School of Medicine, Baltimore, Maryland, USA
4. Program of Comparative Medicine, University of Maryland School of Medicine, Baltimore, Maryland, USA
5. Department of Epidemiology and Public Health, University of Maryland School of Medicine, Baltimore, Maryland, USA
6. Department of Pediatrics, University of Maryland School of Medicine, Baltimore, Maryland, USA