1. Area of Microbiology; Universitary School of Agricultural Engineers; University of León; Campus de Ponferrada, Avda. Astorga s/n Ponferrada 24400 Spain
2. Department of Organic Chemistry; Faculty of Sciences; University of Cádiz; Puerto Real Spain
3. Bacterial Foodborne Pathogen and Mycology Unit; USDA/ARS; National Center for Agricultural Utilization Research; Peoria IL USA
4. Spanish-Portuguese Centre of Agricultural Research (CIALE); Department of Microbiology and Genetics; University of Salamanca; Salamanca Spain