1. The University of Georgia, College of Veterinary Medicine, Veterinary Diagnostic and Investigational Laboratory, 43 Brighton Rd., Tifton, Georgia 31793, USA
2. Current address:, Georgia Department of Natural Resources, 1700 Radium Springs Rd., Albany, Georgia 31705, USA
3. Current address: University of Tennessee, Center for Wildlife Health and Biomedical and Diagnostic Sciences, 274 Ellington PSB, Knoxville, Tennessee 37996-4563, USA
4. Valdosta State University, Biology Department, 1500 N Patterson St., Valdosta, Georgia 31698, USA