1. Center for Global Health, Division of Infectious Diseases and International Health, Department of Medicine, University of Virginia, Charlottesville, VA 22908, USA
2. Center for Modeling Immunity to Enteric Pathogens, Virginia Bioinformatics Institute, Virginia Tech, Blacksburg, VA 24060, USA
3. Department of Pediatrics, School of Medicine, University of Virginia, Charlottesville, VA 22908, USA