1. Residue Chemistry and Predictive Microbiology Research Unit, U.S. Department of Agriculture, Agricultural Research Service; Eastern Regional Research Center; 600 East Mermaid Lane Wyndmoor PA 19038 USA
2. Molecular Characterization of Foodborne Pathogens Research Unit, U.S. Department of Agriculture, Agricultural Research Service; Eastern Regional Research Center; 600 East Mermaid Lane Wyndmoor PA 19038 USA