1. Department of Biochemistry and Microbiology, University of Buea, Buea, Cameroon.
2. Department of Pathology, University of Texas Medical Branch, Galveston, Texas.
3. Center for Biodefense and Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, Texas.
4. Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston, Texas.