Numerous outbreaks in a wide variety of ready-to-eat foods have also been reported due to extensive human handling during their preparation or by cross-contamination from the environment (Escalona et al., 2010). Listeria spp., Salmonella spp., Escherichia coli and Staphylococcus aureus are the most common pathogens detected in vegetables and fruits (Beuchat, 1996; Bracket, 1999).