1. Department of Clinical Laboratory Sciences, University of Texas Medical Branch, Galveston, TX 77555-1070, USA
2. Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston, TX 77555-1070, USA
3. Department of Pathology, University of Texas Medical Branch, Galveston, TX 77555-1070, USA
4. Department of Pediatrics, University of Texas Medical Branch, Galveston, TX 77555-1070, USA
5. Sealy Center for Vaccine Development, University of Texas Medical Branch, Galveston, TX 77555-1070, USA