Listeria monocytogenes
What is Listeria monocytogenes?
Listeria monocytogenes has been recognized as a human pathogen for 60 years, but food was not thought to be a vehicle of transmission until recently. In the United States, an estimated 2,000 persons become seriously ill with listeriosis each year. Of these, 500 die. Pregnant women, newborns, and adults with weakened immune systems are primarily at risk. About one-third of Listeria monocytogenes cases occur during pregnancy.
Listeria monocytogenes is found in soil and water. Vegetables can become contaminated from the soil or from manure used as fertilizer. Animals can carry the bacteria without appearing ill and can contaminate foods of animal origin such as meats and dairy products. The bacteria can be found in a variety of raw foods, such as uncooked meats and vegetables, as well as in processed foods that become contaminated after processing, such as soft cheeses and cold cuts at the deli counter. Unpasteurized (raw) milk or foods made from unpasteurized milk may contain the bacteria.
Symptoms vary and depend on the individual's susceptibility, but may include fever, fatigue, nausea, vomiting and diarrhea.
More Information on Listeria monocytogenes:
-
Listeriosis Information - Centers for Disease Control
-
FSIS Listeriosis Resources:
-Listeria Fact Sheet(PDF file)
-Listeria Tips
Food Safety Project Director
Catherine H. Strohbehn, PhD, RD, CFSP
HRIM Extension Specialist
Adjunct Associate Professor
Hotel, Restaurant, and Institution Management
Iowa State University
Ames, Iowa, 50011-1121 USA
Email: cstrohbe@iastate.edu
Consumer and Processing Food Safety and Science
Sam Beattie, PhD
Food Safety Extension Specialist
Department of Food Science and Human Nutrition
Iowa State University Extension
122A MacKay Hall
Ames, Iowa, 50011-1121 USA
Email: beatties@iastate.edu
- Article History
- Revision Date: 8/16/2006