1. Department of Pharmaceutical and Biomedical Sciences, College of Pharmacy, University of Georgia, Athens, Georgia, USA
2. Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA
3. Department of Microbiology, Franklin College of Arts and Sciences, University of Georgia, Athens, Georgia, USA
4. Department of Genetics, Franklin College of Arts and Sciences, University of Georgia, Athens, Georgia, USA