1. Aquatic Animal Health, Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, Florida 32610, USA
2. Current address: Phoenix Central Laboratory for Veterinarians, 11620 Airport Rd., Everett, Washington 98204, USA
3. Current address: R. Rember Veterinary Services, PO Box 83, Ester, Alaska 99725, USA
4. Infectious Disease and Pathobiology, College of Veterinary Medicine, University of Florida, Gainesville, Florida 32610, USA
5. Marine Mammal Pathobiology Laboratory, 3700 54th Avenue South, St. Petersburg, Florida 33711, USA
6. Current address: Lightsey Veterinary Relief Services, 239 Granite Street, Pacific Grove, California 93950, USA
7. Current address: Hubbs–SeaWorld Research Institute, 3830 South Highway A1A #4-181, Melbourne Beach, Florida 32951, USA;
8. United States Geological Survey, Sirenia Project, Southeast Ecological Science Center, Gainesville, Florida 32605, USA;