Listeriosis is a foodborne illness caused by consumption of foods contaminated with the listeria monocytogenes bacterium. Various produce, dairy, uncooked meats, and packaged produce can carry the listeria bacteria which can cause digestive problems, severe illness, and even death. Older adults, pregnant women, newborns, and adults with a weakened immune system are the most at-risk populations. Symptoms of listeria can develop anywhere from three days to three months after ingesting the contaminated food. If you’re experiencing any of the symptoms, it’s important that you contact your doctor immediately for diagnosis and treatment options.