作者单位:Department of Pathology, The University of Texas Medical Branch, Galveston, TX 77555, USA[1]Department of Microbiology & Immunology, The University of Texas Medical Branch, Galveston, TX 77555, USA[2]Center for Biodefense and Emerging Infectious Diseases, The University of Texas Medical Branch, Galveston, TX 77555, USA[3]