700 Children's® – A Blog by Pediatric Experts

Listeria: Know the Facts

Oct 17, 2022

A recent listeria contamination has been identified in various cheese products, hospitalizing at least five patients. As the FDA continues to investigate this contamination, cheeses continue to be recalled. If you have recently purchased a cheese product from Old Europe Cheese Inc., make sure to check the recall list. If your cheese is listed, discard the item immediately. Before dipping your bread into ooey-gooey brie this holiday season, make sure it is safe to eat!

This begs the question: What is listeria?
Listeria monocytogenes is a bacterial organism that makes its home in soil where it can contaminate vegetation and livestock. It is most commonly passed to humans on raw fruits and vegetables, raw meat, hot dogs, deli meat, smoked fish, milk, cheese and other dairy products. Unlike many other bacteria, listeria can grow in the cold temperatures of refrigeration. Rinsing produce can halt its spread, but cooking or pasteurization is required to kill it.

What symptoms does listeria cause?
Listeria enters the human body through the GI tract. In many cases, it causes no symptoms at all, and a healthy immune system kills it before illness strikes. Other times, listeria causes vomiting and diarrhea which can lead to dehydration. Fever and muscle aches are also possible. Sometimes the bacteria remains in the GI tract several weeks before causing illness, and incubation periods as long as 70 days have been reported.

Is listeria dangerous?
It can be—especially if the organism invades the intestinal wall and enters the bloodstream. This is most likely to occur in those with compromised immune systems. Young infants, pregnant women, elderly adults, transplant and chemotherapy patients, and those with chronic illnesses such as kidney and liver disease and diabetes are at highest risk for invasive disease.

Pregnant women are 20 times more likely to suffer invasive disease compared with healthy adults, and the organism can infect mom’s baby. This may result in miscarriage, stillbirth or life-long health problems.

What else happens when listeria invades the body?
Invasive listeria can result in an overwhelming infection of the bloodstream known as sepsis. Listeria also has an affinity for the central nervous system and may cause meningitis. Both of these conditions are deadly and require hospital admission and IV antibiotics.

What should you do?
Keep in mind, most cases of listeria (especially in people with healthy immune systems) are mild and get better on their own. Treatment is necessary only in cases of severe or invasive disease. Those at high risk should call their doctor if they experience any concerning symptoms in the weeks following a possible exposure.

Anyone who falls very ill with fever, stiff neck, headache, or persistent vomiting should call their physician or visit their nearest Emergency Department or Urgent Care immediately.

Featured Expert

Nationwide Children's Hospital Medical Professional
Mike Patrick, MD
Emergency Medicine; Host of PediaCast

Dr. Mike Patrick is an Assistant Professor of Pediatrics at the Ohio State University College of Medicine and Medical Director of Interactive Media for Nationwide Children's Hospital. Since 2006, he has hosted the award-winning PediaCast, a pediatric podcast for parents. Dr. Mike also produces a national podcast for healthcare providers—PediaCast CME, which explores general pediatric and faculty development topics and offers free AMA PRA Category 1 Credit™ to listeners.

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700 Children’s® features the most current pediatric health care information and research from our pediatric experts – physicians and specialists who have seen it all. Many of them are parents and bring a special understanding to what our patients and families experience. If you have a child – or care for a child – 700 Children’s was created especially for you.