1. Department of Pathology, College of Veterinary Medicine, University of Georgia, 501 D. W. Brooks Drive, Athens, Georgia 30602.
2. Department of Pathobiology and Population Medicine, College of Veterinary Medicine, Mississippi State University, 127 Experiment Station Road, Stoneville, Mississippi 38776.
3. USDA-ARS, Warmwater Aquaculture Research Unit, 141 Experiment Station Road, Stoneville, Mississippi 38776.
4. Thad Cochran National Warmwater Aquaculture Center, Delta Research and Extension Center, Mississippi State University, 127 Experiment Station Road, Stoneville, Mississippi 38776.