1. Department of Food Science The Pennsylvania State University University Park PA 16802 USA
2. Pennsylvania Department of Health Harrisburg PA 17120 USA
3. Center for Veterinary Medicine U.S. Food and Drug Administration Laurel MD 20708 USA
4. U.S. Geological Survey ‐ National Wildlife Health Center Madison WI 53711 USA
5. E. coli Reference Center The Pennsylvania State University University Park PA 16802 USA