1. Laboratory for Calicivirus Studies, College of Veterinary Medicine, Oregon State University, Corvallis, Oregon 97331, USA
2. Department of Medicine, School of Veterinary Medicine, University of California, Davis, California 95616, USA
3. Center for Pediatric Research, Children's Hospital of the King's Daughters, Eastern Virginia Medical School, Norfolk, Virginia 23510, USA
4. Present address: Department of Veterinary Science/Microbiology, North Dakota State University, Fargo, North Dakota 58105, USA
5. Oregon Department of Fish and Wildlife, Marine Region, Marine Science Drive, Building 3, Newport, Oregon 97365, USA