Federal officials are investigating a new outbreak of Listeria monocytogenes infections.

The outbreak announcement from the Food and Drug Administration reports that 20 people are sick, but does not include what states are involved. 

Investigators have begun traceback efforts of some sort, but specific foods are not included in the outbreak announcement.

As of this afternoon, the Centers for Disease Control and Prevention have not released any details concerning the outbreak.

There have not been any product recalls associated with this new outbreak.

About Listeria infections

Food contaminated with Listeria monocytogenes may not look, smell or taste spoiled but can still cause serious and sometimes life-threatening infections. Anyone who has developed symptoms of Listeria infection should seek medical treatment. Specific tests are required to diagnose Listeria infections because the symptoms can mimic other illnesses.

It can take up to 70 days after exposure to Listeria for symptoms of listeriosis to develop. 

Symptoms of Listeria infection can include vomiting, nausea, persistent fever, muscle aches, severe headache, and neck stiffness. 

Pregnant women, the elderly, young children, and people such as cancer patients who have weakened immune systems are particularly at risk of serious illnesses, life-threatening infections, and other complications. Although infected pregnant women may experience only mild, flu-like symptoms, their infections can lead to premature delivery, infection of the newborn, or even stillbirth.

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