1. Department of Infectious Diseases, Coverdell Center for Biomedical and Health Sciences, 500 D. W. Brooks Drive, University of Georgia, Athens, GA, USA
2. Graduate Program in Microbiology, University of Georgia, Athens, GA, USA
3. Graduate Program in Infectious Diseases, University of Georgia, Athens, GA, USA
4. Center for Vaccines and Immunology, College of Veterinary Medicine, University of Georgia, 501 D. W. Brooks Drive, Athens, GA, USA
5. Department of Biology, Emory University, 1510 Clifton Road, Atlanta, GA, USA