1. Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston, TX, USA.
2. Institute for Human Infection and Immunity, University of Texas Medical Branch, Galveston, TX, USA.
3. World Reference Center of Emerging Viruses and Arboviruses, University of Texas Medical Branch, Galveston, TX, USA.
4. Center for Biodefense and Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, TX, USA.