1. 1Food Safety Policy Center and Department of Advertising, Public Relations, and Retailing, Michigan State University, East Lansing, Michigan 48824, USA
2. 2Public Health Agency of Canada, Laboratory for Foodborne Zoonoses, 160 Research Lane, Unit 206, Guelph, Ontario, Canada N1G 5B2
3. 3Bartleson Food Safety Consultants, P.O. Box 11983, Olympia, Washington 98508-1983, USA
4. 4The B. Michaels Group Inc., 487 West River Road, Palatka, Florida 32177, USA