Invasive Listeria monocytogenes Gastroenteritis Leading to Stupor, Bacteremia, Fever, and Diarrhea: A Rare Life-Threatening Condition.

Listeria monocytogenes is a gram-positive, rod-shaped organism that can cause serious infections such as meningitis, invasive gastroenteritis, and endocarditis. Every year 1600 people in the United States are affected, with significant mortality of 260 people annually. Listeria gastroenteritis has the third highest mortality rate among all the food-borne infection. Invasive listeriosis most commonly affect pregnant women, those in extremes of ages, people with comorbid diseases, and people with weakened immune response. In this article, we present a rare case of invasive Listeria gastroenteritis in an 83-year-old female with multiple comorbid conditions and past medical history of type 2 diabetes mellitus and multiple risk factors who was brought to the hospital with altered mental status. She had history of fever, abdominal pain, and watery diarrhea up to 14 episodes in 24 hours for the last 7 days. Her stool culture grew Listeria monocytogenes sensitive to penicillin. She was started on penicillin for 2 weeks. She had subsequently complete resolution of fever, diarrhea, and abdominal pain. High index of suspicion is the key to ensure timely initiation of appropriate empirical treatment in the setting of invasive gastroenteritis, especially in people who have high risk factors for listeriosis. We recommend raising awareness in the health care profession about invasive listeriosis in the need of time. Intravenous ampicillin or penicillin G is the treatment of choice, with meropenem as an alternative.