Cross-contamination and cross-contact are two of the most important concepts in food safety, yet they're often confused with one another. While the terms sound similar, they refer to different risks and require different prevention strategies.
But both can have serious consequences for customers and significant implications for foodservice operations.
If you are someone who handles, prepares, or serves food, you need to know the difference between the two. In this guide, we'll explain what cross-contamination and cross-contact are, how they occur, and the steps foodservice employees can take to prevent them.
What is the difference between cross-contamination and cross-contact?
What is the difference between cross-contamination and cross-contact?
Cross-contamination occurs when harmful microorganisms such as bacteria or viruses spread from one food, surface, or person to another, potentially causing foodborne illness.
Cross-contact occurs when an allergen is unintentionally transferred to a food, making it unsafe for someone with a food allergy.
Put simply, cross-contamination creates a food safety risk for everyone, while cross-contact creates a risk for individuals with specific food allergies.
What is cross-contamination?
Cross-contamination occurs when harmful bacteria or viruses are transferred from one substance to another during the food preparation process. It is one of the most common ways that food becomes unsafe.
What are the different types of cross-contamination?
There are three main types of cross-contamination: food-to-food, equipment-to-food, and people-to-food.
Food-to-food
Raw, undercooked, and incorrectly washed foods can all be host to harmful bacteria like E. coli, Listeria monocytogenes, and Salmonella. Food-to-food contamination occurs when contaminated foods come into contact with uncontaminated foods.
According to Healthline, foods that pose the highest risk for contamination include raw meat, poultry, seafood, and eggs along with leafy greens, bean sprouts, leftover rice, unpasteurized milk, soft cheeses, and deli meats.1
With that in mind, you should pay close attention to the expiration and “best by” dates on all the ingredients in use–and be careful not to fall prey to the common food safety myth that if foods look and smell safe to eat, they are indeed safe.
Equipment-to-food
Bacteria and viruses can live on food contact surfaces for long periods of time. The cleanliness of the utensils, cutting boards, countertops, and storage containers used to prepare meals is critical to food safety.
Some common examples of equipment-to-food contamination occur when someone:
-
places a newly cooked hamburger on the same plate that held the same patty when it was raw
-
uses the same cutting board and knife to cut raw meat followed by vegetables that will be consumed raw
-
neglects to properly wash, rinse, and sanitize their equipment
People-to-food
The human element is often forgotten when people are discussing food safety practices. People-to-food contamination occurs when harmful pathogens are transferred from a person’s body or clothes. Maintaining good personal hygiene and handwashing habits are the best strategies to prevent people-to-food contamination.
What is cross-contact?
The way we talk about safety for people with food allergies has evolved as those allergies have become more and more common. Cross contact is a term specifically used when discussing allergens. It is defined as a food being transferred to another food during the storage, preparation, or cooking process.2 Similar to cross contamination, cross contact can occur because of food-to-food, equipment-to-food, and people-to-food contact.
What are the different types of cross-contact?
There are three main types of cross-contact: food-to-food, equipment-to-food, and people-to-food.
Food-to-food
The kitchen is a fast-paced environment and it can sometimes be difficult to spot an allergen risk on the fly. Being mindful of where some of the most common allergens show up on your menu can save you and the whole kitchen a lot of time (and risk!).
Some strategies for preventing this kind of contact include:
-
communicating with the expo team to ensure cheese doesn’t make it onto a salad for someone who is lactose intolerant
-
reading the label of a sauce to ensure it doesn’t have peanut oil in it before serving it to someone with a peanut allergy
Equipment-to-food
The oil, dust, and/or residue from foods are often invisible to the eye. Similar to preventing cross-contamination, following best practices for washing, rinsing, and sanitizing equipment can help prevent an allergic reaction in your customers. It is always a best practice to use separate equipment for preparing allergy-safe foods.
People-to-food
Particles of allergenic foods can linger on a person’s clothes and bodies just as much as dangerous pathogens. This means the personal hygiene best practices that protect people from foodborne illnesses also protect people from allergic reactions.
Why knowing the difference is so important
Cross-contamination and cross-contact aren't interchangeable terms, and confusing them can have serious consequences.
Cross-contamination spreads harmful pathogens that can make anyone sick. Cross-contact spreads allergens that can trigger a reaction in someone with a food allergy. Both can happen during storage, preparation, cooking, or service, and both require intentional prevention strategies.
The good news is that the same culture of food safety that helps prevent foodborne illness can also reduce allergen risks. When employees understand the difference, follow proper procedures, and stay alert to potential hazards, they help create a safer experience for every guest who walks through the door.
Put simply: cross-contamination can make food unsafe for everyone. Cross-contact can make food unsafe for someone. And preventing both is part of serving food safely.
Want to strengthen your team's allergen awareness and food safety knowledge? Trust20's Food Allergy Certificate Training helps foodservice professionals understand allergen risks, prevent cross-contact, and follow best practices for protecting guests with food allergies. Explore the course today and help build a safer, more informed workplace.
FAQ
Can cross-contamination cause foodborne illness?
Yes. Cross-contamination is one of the leading causes of foodborne illness. It can occur when harmful microorganisms from raw foods, contaminated equipment, or employees' hands are transferred to ready-to-eat foods.
What are some common examples of cross-contamination?
Common examples include using the same cutting board for raw chicken and fresh vegetables, placing cooked food on a plate that previously held raw meat, or handling food without properly washing your hands.
How can foodservice employees prevent cross-contamination?
Employees can reduce the risk of cross-contamination by washing their hands frequently, storing raw and ready-to-eat foods separately, using designated equipment when appropriate, and following proper cleaning and sanitizing procedures.
How can foodservice employees prevent cross-contact?
Preventing cross-contact requires careful allergen management, including reading ingredient labels, using clean equipment, avoiding shared preparation surfaces, and communicating clearly when preparing food for guests with allergies.
Who should receive training on cross-contamination and cross-contact?
Anyone involved in storing, preparing, handling, serving, or managing food should understand how to prevent both cross-contamination and cross-contact. Ongoing food safety and allergen awareness training can help employees recognize risks and follow safe food handling practices.
Sources:
- Healthline: Bacterial Cross Contamination: All You Need to Know
- Thrive: Cross-Contamination, Cross-Contact, & Food Safety at Your Event
