Overview

Listeriosis is a serious infection usually caused by eating food contaminated with the bacterium Listeria monocytogenes. 

The disease primarily affects older adults, pregnant women, newborns, and adults with weakened immune systems, but individuals without these risk factors can also be affected.

Symptoms & Diagnosis

Listeriosis can cause different symptoms depending on which part of the body it affects. If it leads to meningoencephalitis, symptoms can include a sudden fever, severe headache, nausea, vomiting, and signs of irritation in the brain and spinal cord. In other areas of the body, the main symptom is often lesions at the infection site. Most Listeria infections cause fever and flu-like symptoms similar to other illnesses. Only specific lab tests can confirm the disease.

Treatment

Several antibiotics are effective against this organism. Ampicillin, either alone or in combination with other antibiotics, is frequently used.

Prevention

Since the organism is widespread in nature, basic sanitary measures such as using only pasteurized dairy products, eating cooked meats, and washing hands thoroughly before preparing foods offer the best protection. Following safe food preparation, consumption, and storage guidelines reduces the risk associated with Listeria.

Reporting

Listeria is a reportable condition.

Learn more about reportable conditions

Resources for the General Public