1. Integrated Research Facility at Fort Detrick, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Fort Detrick, Frederick MD 21702, USA
2. United States Geological Survey Western Fisheries Research Center, Seattle, WA 98115, USA
3. National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda MD 20894, USA
4. School of Veterinary Medicine, Murdoch University, Murdoch, WA 6150, Australia