Listeriosis is a serious infection caused by a bacteria called
Listeria monocytogenes. About 1,600 people get
listeriosis each year, usually after eating contaminated food.
Pregnant people, newborns and children with weakened immune systems and adults over age 65 years are at higher risk if they get infected. Pregnant people can spread the bacteria to the baby in the womb. If a person gets infected early in pregnancy, they are at high risk of miscarriage. Late in pregnancy, the infection can cause stillbirth, or the baby can be born with a serious illness or die shortly after delivery.
Listeriosis rarely causes serious problems for healthy children.
How common is
Listeria?
L monocytogenes bacteria are found in the environment. Like other germs,
Listeria can contaminate food and cause food poisoning.
Some foods that get contaminated with
Listeria more often include: soft cheeses (such as feta, brie, Camembert),
raw milk, processed meat (such as hot dogs, deli meat, pâté), undercooked poultry and unwashed raw vegetables.
Chicken fettucine alfredo meals from
FreshRealm are recalled due to possible listeria contamination. The products were sold in grocery stores in multiple states. Anyone who bought the recalled meals should destroy them or return to the place of purchase for a refund.
Learn more
about outbreaks here.
What are symptoms of listeriosis?
Listeria symptoms can include fever and
diarrhea. People rarely become seriously ill; most recover on their own without medical care. Symptoms usually begin within 24 hours after eating the contaminated food and can last two to three days.
Severe illness is less common. It can develop days to weeks after eating contaminated food. Serious childhood cases of listeriosis can lead to
meningitis. Listeriosis can be serious for pregnant people and cause pregnancy loss or premature birth. In pregnancy, symptoms may include fever, fatigue, muscle aches and intestinal problems, or they may have no symptoms of infection. Infections also can be serious or deadly for infants. Symptoms of
listeriosis in an infant may include:
Listlessness (sleepy, drowsy, sluggish)
Vomiting
Loss of appetite
Yellow color of the skin and eyes (jaundice)
Skin rash
Breathing problems
How is listeriosis diagnosed & treated?
Listeriosis is detected through laboratory testing of blood, urine and cerebrospinal (from the brain and spine) fluid. If your pediatrician suspects that your newborn may have listeriosis, the placenta or amniotic fluid can be tested for the germ.
When listeriosis is diagnosed in a pregnant person, treatment of the infection can prevent the spread of infection to the fetus or newborn. Antibacterial medication also can be used to treat
L monocytogenes infections in infants.
How to prevent listeriosis
Those at greater risk for listeriosis should follow food safety steps to avoid getting sick:
Eat or serve only fully cooked food from animal sources.
Check the label of dairy products and do not eat the food unless the label says it is pasteurized. Avoid
raw (unpasteurized) milk and dairy foods made from it (for example, unpasteurized soft cheeses like feta, brie and queso fresco).
Wash raw vegetables.
Store ready-to-eat foods at 40°F or lower.
Keep uncooked meats separate from vegetables.
Wash your hands, knives and cutting boards after they have touched uncooked foods.
Thoroughly cook leftover foods and ready-to-eat foods such as hot dogs until they are steaming hot.
Stay away from foods from delis such as prepared salads, meats or cheeses, or heat these foods until steaming before eating.
Finally, keep in mind that pasteurizing food will kill
Listeria. But pasteurized foods can still be contaminated with the bacteria if they are in contact with unclean surfaces or equipment.
More information