Was that last 24 Hour “Bug” You Had Really a Foodborne Illness in Disguise?

Within this blog, I have discussed many foodborne pathogens: E. coli, Hepatitis, Salmonella, Listeria monocytogenes, and Campylobacter.  But we’ve somehow managed to omit Staphylococcus aureus (S. aureus).

It isn’t that it is any less important than the others we have discussed. S. aureus causes a wide variety of infections, from skin infections to diseases that can be potentially fatal.  And while it isn’t among the top foodborne illnesses in the United States, estimates indicate that S. aureus causes just less than 250,000 illnesses in the United States each year.  It should be noted through, that these incidences may be much higher than estimated due to non-reports of the illness.

S. aureus can grow in a wide range of temperatures, from 44°F to 119°F and while most pathogens thrive in moist environments, S. aureus has the ability to survive dry and otherwise stressful instruments, such as the human nose and skin, and even on clothing and other surfaces.

The formation of these toxins is one reason why cooking the food will be of no use in protecting yourself or your guests.

Symptoms of S. aureus include nausea, vomiting, stomach cramps, and in most cases, diarrhea. Symptoms can begin as little as 30 minutes after consuming a food or beverage item contaminated with S. aureus but can sometimes take as long as 8 hours to manifest in symptoms. These symptoms usually last for no longer than 24 hours and rarely result in severe illness.

Does this sound like the last “24-hour” bug you or your children may have had?  This is one of the reasons why it is believed that the incidence of S. aureus is much higher than estimated, most simply do not visit a medical professional who can diagnose S. aureus.

The reason why S. aureus can make someone ill so quickly is because of the nature of the bacteria.  In the case of an S. aureus illness, the bacteria may have multiplied on the food since the time the food came into contact with the host food item. These bacteria then leave behind a toxin on the food, which is what causes the illness.  For example, think of a food that might have a cleaning chemical on it – it would make you sick very quickly after ingesting the item.

The formation of these toxins is one reason why cooking the food will be of no use in protecting yourself or your guests. Yes, cooking the product will eliminate the S. aureus bacteria, but it does not eliminate the toxin that the bacteria left behind.

Food items commonly implicated in S. aureus illnesses include milk and cheeses, but other food products that have been implicated in such illnesses include cold salads, sliced deli meats, sandwiches, cream-filled pastries, and puddings.

S. aureus is just one of the reasons why it is important to pay attention to safe food handling throughout the entire life of a product. Avoiding cross contamination, ensuring proper personal hygiene (unlike the sushi chef picture we used for the blogs – did you notice they were not wearing gloves?), and storing food at proper temperatures are key steps in protecting your operation from a S. aureus outbreak (and almost all other foodborne illnesses). Risk Nothing. 

Evaluating Food Safety

One of the suggestions I made in the last blog was to assess the food safety culture in your organization by observing the food handling techniques of workers. Let’s explore that some more. You can do an overall assessment or you can hone in on specific areas of the operation, such as production or cleaning practices. Remember, when the environmental health inspector visits your operation, he/she just gets a snapshot of what is going on in your operation on that particular day at that specific time. You are there nearly every day, so you have a much better understanding on what really happens in your operation.

September is Food Safety Education Month: The Culture of Food Safety

Developing a culture of food safety is important for any foodservice operation. You may be wondering--just what is a culture of food safety? Let’s start talking about it by first defining what is meant by culture. When you look culture up in the dictionary, you will see terms such as shared knowledge, beliefs, values, attitudes, and meanings; a way of life; patterns of behavior; learned behavior of a group of people; and transmitted from generation to generation. I think these descriptors provide good insight into the meaning of a culture of food safety. You can also think about where you grew up, and a vision of culture comes. For example, I grew up in rural Oklahoma, graduating in the 1970’s with a class of 24 students. My culture instilled in me an appreciation for rural life, hard work, and independence. As I grow older, I realize I haven’t changed very much from my early years, even though I have completed a PhD, lived a lot of places, and traveled throughout the world!

Produce Safety: Special Considerations

In our last blog, I talked about general produce safety. Today, I want to talk about some special products—melons, tomatoes, leafy greens, and sprouts. These are all foods that have a history of bacterial contamination leading to foodborne illness. I also want to discuss salad bars because they have some special risks.