1Department of Virology and Immunology, Texas Biomedical Research Institute, San Antonio, TX, USA
2Department of Medical Microbiology, Center for Infectious Diseases, Leiden University Medical Center, Leiden, The Netherlands
3Medigen, Inc., Frederick, MD, USA
4Department of Pharmacology and Toxicology, School of Medicine, Center for Predictive Medicine for Biodefense and Emerging Infectious Diseases, NIH Regional Biocontainment Laboratory, University of Louisville, KY, USA