Keep your MN kitchen running smoothly. We’re sharing real-world ServSafe & NEHA Best Practices to help you train staff and ace your next health inspection.

Serve Safe Certification Guide to Listeria

Latest ServSafe Guidelines For Disastrous Listeria

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When we prepare for ServSafe certification classes, we monitor food product recalls and FDA warnings concerning food-borne illness outbreaks. In the last three months, nine people have died, and nearly 60 patients have been hospitalized with Listeria. The source of this outbreak was tracked to meats sliced at delis, including Boar’s Head brand liverwurst, which was contaminated with Listeria and sickened people. With Listeria impacting food safety and being prevalent in the news, ServSafe managers must understand this bacterium, how it spreads, and how to prevent it from sickening customers who consume your food products.

ServSafe Certification Guide to Listeria
Image Credit: by jpalinsad360 thru www.flickr.com

ServSafe Certification Guide to Listeria

Listeria is a unique case for food-borne illness suspects because, unlike many other bacteria, it grows and multiplies at much colder temperatures than other contaminants. This means that any product contaminated with Listeria can be dangerous, even if stored in the refrigerator. Listeria bacteria can remain active at temperatures that approach and dip below freezing.

The low breeding temperature of Listeria makes it vital that ServSafe managers handle food properly. Ensure you rinse raw produce thoroughly, cook all prepared foods to the proper temperatures, and always clean and sanitize prep surfaces after preparing raw foods. Some of the most common foods that are responsible for Listeria outbreaks include:

  • Raw dairy and soft cheeses
  • Raw sprouts
  • Hot dogs and deli meats
  • Smoked or cold-cured seafood

Even though these are the most common sources of Listeria, we have noticed an increase in recalls and outbreaks traced back to frozen vegetables and fruits. We urge you to monitor FDA recalls. You can easily do this by viewing the FDA widget on the right-hand side of our blog page.

While ServSafe managers cringe at discussing the effect of Listeria poisoning, it is vital to understand the symptoms to identify the cause of a foodborne illness. Listeria poisoning incubates between a few days to a few months, so symptoms can arise long after tainted food has been consumed. Symptoms can include:

  • Fever
  • Soreness in the neck
  • Disorientation
  • Reduced strength
  • Vomiting

A quick read of Listeria poisoning symptoms closely resembles a list of flu symptoms with a few exceptions. Listeria attacks the nervous system as well as the digestive system. When you hear about these symptoms, there is a chance that Listeria is the culprit.

What to Do If You Have A Listeria Outbreak


If you do have an unfortunate incident involving Listeria at your establishment, it is essential to cooperate with your local health department. The bacteria could have originated from one of your suppliers, so giving the health department all your information can help prevent further cases.

If you want to learn more about Listeria and other bacteria, we offer ServSafe certification classes online or led by a qualified instructor.

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ServSafe MN Training and the Mayonnaise Myth

ServSafe Training: The Fascinating Mayonnaise Myth Exposed

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During ServSafe MN training, we often discuss stories of food poisoning incidents blamed on tainted mayonnaise in potato salad, sandwiches, or dips. Mayonnaise is widely believed to be highly perishable and demands additional precautions when utilized in food production. If you investigate further, you’ll find that it’s often not mayonnaise that has caused a foodborne illness. More often it’s other ingredients that have not been prepared to ServSafe training standards.

ServSafe MN Training and the Mayonnaise Myth

ServSafe MN Training and the Mayonnaise Myth

Commercially produced mayonnaise is loaded with acids and preservatives, so it generally does not spoil quickly. Refrigerating mayonnaise is typically recommended. However, the recommendation is more about diners’ taste preferences than creating a food safety hazard. There are even some unverified claims that adding mayo to dressings, and cold sauces can extend the life of those products. These claims are attributed to the acids and preservatives in commercially produced mayonnaise.

To be clear, ServSafe training does not refer to commercially processed mayo in this discussion. If you make your own mayonnaise in your restaurant, you will likely use raw eggs. You will also likely not add as much acid and preservatives as your standard store-bought mayo. We strongly recommend treating in-house mayonnaise as a volatile food product and always keeping it under refrigeration.

If it’s not the mayonnaise that causes food poisoning, why do common dishes that contain it make people ill? Ingredients such as cooked potatoes, pasta, and vegetables are not shelf-stable. Cooked potato dishes are, in fact, highly susceptible to bacteria growth. Leaving a potato or pasta salad at room temperature for an extended time will create a health hazard for anyone who consumes it. Many potato salads also contain cooked eggs, which are incredibly susceptible to bacteria if not refrigerated properly.

Cross-contamination Is Frequently The Culprit

We have also heard mayonnaise blamed for food poisoning incidents that have occurred as a result of eating at a buffet-style event. Cross-contamination during food preparation or service directly causes the onset of these illnesses. Cross-contamination occurs when a utensil is dipped into another dish on the buffet or when the mayo spreader comes into contact with meat proteins and then is returned to the mayonnaise dish. In these cases, it is highly likely that bacteria have contaminated the mayonnaise. While that mayonnaise may not need refrigeration, any bacteria introduced into it will grow at room temperature.

The bottom line of the ServSafe training is that it is crucial to avoid cross-contamination and handle every ingredient correctly when using mayonnaise in your establishment.