1. Department of Microbiology and Immunology, University of Mississippi Medical Center, Jackson, Mississippi, USA
2. Department of Biological Sciences, Mississippi State University, Mississippi State, Mississippi, USA
3. Department of Basic Sciences, College of Veterinary Medicine, Mississippi State University, Mississippi State, Mississippi, USA
4. Department of Medicine, University of Mississippi Medical Center, Jackson, Mississippi, USA
5. Department of Surgery, University of Mississippi Medical Center, Jackson, Mississippi, USA