1. 1Economic Research Service, U.S. Department of Agriculture, 1800 M Street N.W., Washington, D.C. 20036
2. 2Oregon Health Division, 800 N.E. Oregon Street, Suite 772, Portland, Oregon 97232
3. 3New York State Department of Health, Wadsworth Center, ESP-P.O. Box 509, Albany, New York 12201
4. 4Minnesota Department of Health, Acute Disease Epidemiology Section, 717 S.E. Deleware Street, Minneapolis, Minnesota 55440
5. 5Foodborne and Diarrheal Diseases Branch, Division of Bacterial and Mycotic Diseases, Centers for Disease Control and Prevention, 1600 Clifton Road N.E., Mailstop D-63, Atlanta, Georgia 30333
6. 6Georgia Division of Public Health, Notifiable Disease Unit, 2 Peachtree Street N.W., Suite 14-132, Atlanta, Georgia 30033
7. 7Formerly with the California Emerging Infections Program, 703 Market Street, Suite 705, San Francisco, California, 94103, USA