Listeriosis is one of the communicable diseases that is reportable in the state of Texas and therefore investigated by the Bureau of Epidemiology. In the United States, approximately 1,100 people are seriously ill each year and 250 die of Listeriosis. Individuals at risk are (1) pregnant women; (2) newborns; (3) people with weakened immune systems, ie: cancer, diabetes, kidney disease, and AIDS; (4) people who take glucocorticosteroid medications and (5) the elderly. Symptoms of listeriosis include fever, muscle aches, nausea and diarrhea. If the infection spreads to the nervous system, the person may experience headache, stiff neck and confusion.

The bacterium, Listeria Monocytogenes, is found in soil and water, therefore vegetables can become contaminated from the soil or from manure used as fertilizer. Animals can carry the bacterium and not appear ill, thus foods from infected animals such as meat and dairy products can be the source of illness in humans if the meat is not properly cooked or the milk or cheese is unpasteurized.

To reduce the risk of Listeriosis: avoid soft cheeses, such as feta, Brie and imported unpasteurized cheese. Cook left over foods or ready-to-eat foods, such as hot dogs, until steaming hot. As always, keep uncooked meats separate from vegetables and cooked or ready to eat food; wash hands, knives and cutting boards after handling uncooked foods. Cook thoroughly all raw meats.