Department of Epidemiology and Biostatistics and Health Informatics Institute and Center for the Ecology of Infectious Diseases, University of Georgia, Athens, Georgia, United States of America.|Institute of Bioinformatics, University of Georgia, Athens, Georgia, United States of America.|Department of Epidemiology and Biostatistics, University of Georgia, Athens, Georgia, United States of America.|Department of Mathematics and Computational Science, University of South Carolina Beaufort, Bluffton, South Carolina, United States of America.|Department of Microbiology and Immunology, Emory University School of Medicine, Atlanta, Georgia, United States of America.|Department of Biology, Emory University, Atlanta, Georgia, United States of America.