Cross-Contamination

What It Means

Cross-contamination is the unintentional transfer of harmful substances, including bacteria, viruses, allergens, chemicals, or foreign objects, from one food product, surface, or piece of equipment to another. In food manufacturing and processing, cross-contamination is one of the most common causes of food recalls, particularly those involving undeclared allergens. Cross-contamination can occur at any point in the food supply chain: during growing and harvesting, processing, packaging, storage, transportation, or preparation. In manufacturing facilities, cross-contamination often occurs when the same equipment is used to process products containing different allergens without adequate cleaning between production runs, or when allergen-containing ingredients are stored or handled near allergen-free products. Shared production lines are a frequent source of allergen cross-contamination. For pathogen cross-contamination, common scenarios include raw meat juices dripping onto ready-to-eat foods, using the same cutting board for raw and cooked foods, or inadequate handwashing by food handlers. The FDA requires food manufacturers to implement preventive controls to minimize cross-contamination risks as part of their food safety plans under FSMA. Advisory statements such as "may contain" or "produced in a facility that also processes" are voluntary and not regulated by the FDA, though the presence of undeclared allergens due to cross-contamination can trigger mandatory recalls.