1. Blood Systems Research Institute, San Francisco, California 94118
2. University of California, San Francisco, San Francisco, California
3. Centre for Infectious Diseases, University of Edinburgh, Summerhall, Edinburgh EH9 1QH, United Kingdom
4. Division of Infection Diseases, Stanford University, Stanford, California
5. BioReliance Corporation, 14920 Broschart Road, Rockville, Maryland 20850
6. Department of Fisheries and Oceans, Central and Arctic Region, 501 University Crescent, Winnipeg, Manitoba R3T 2N6, Canada