Why it’s a Threat

This pathogen causes nearly 2,500 cases of listeriosis per year in the United States. It primarily affects pregnant women, newborns, and adults with weakened immune systems.

Description

Gram-positive bacteria, found as single short rods or chains approximately 0.5 micron wide and 1 micron long. Listeria may swim with 1-5 flagella to invade human cells.

Vehicles

Cold and/or wet places including refrigeration and air handling systems; thrives in dairy products including soft cheeses, deli meats, hotdogs, and food processing plants.

Prevention

Thoroughly cook raw food from animal sources, such as beef, pork, or poultry. Wash raw vegetables thoroughly before eating. Keep uncooked meats separate from vegetables and from cooked foods and ready-to-eat foods. Avoid unpasteurized (raw) milk or foods made from unpasteurized milk. Wash hands, knives, and cutting boards after handling uncooked foods. Consume perishable and ready-to-eat foods as soon as possible.

Remarks

Although harmless in most healthy people, listeriosis poses a serious threat to pregnant women, newborns, and individuals with weakened immune systems.

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