1. Center for Infection and Immunity, Mailman School of Public Health, Columbia University, New York, NY, USA
2. Center for Biodefense and Emerging Infectious Diseases, Department of Pathology, University of Texas Medical Branch, Galveston, TX, USA
3. 454 Life Sciences, Branford, CT, USA
4. Arthropod-borne and Infectious Diseases Laboratory, Department of Microbiology, Immunology and Pathology, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO, USA