1. 1UCD-Centre for Food Safety, School of Public Health, Physiotherapy and Sports Science, University College Dublin, Belfield, Dublin D04 N2E5, Ireland
2. 2USDA-ARS-US Meat Animal Research Center, Clay Center, NE 68933, USA
3. 3Enteric Disease Laboratory Branch, Division of Foodborne, Waterborne, and Environmental Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA