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Listeria monocytogenes is a bacterial pathogen and causative agent for the foodborne infection listeriosis, which is mainly a threat for pregnant, elderly, or immunocompromised individuals. Due to its ability to invade and colonize diverse eukaryotic cell types including cells from invertebrates, L. monocytogenes has become a well-established model organism for intracellular growth.

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Evaluations of Listeria monocytogenes dose-response relationships are crucially important for risk assessment and risk management, but are complicated by considerable variability across population subgroups and L. monocytogenes strains. Despite difficulties associated with the collection of adequate data from outbreak investigations or sporadic cases, the limitations of currently available animal models, and the inability to conduct human volunteer studies, some of the available data now allow refinements of the well-established exponential L.

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Listeria and enterococcal infections in neonates 28 days of age and younger: is empiric parenteral ampicillin still indicated?

Pediatr Emerg Care

April 2014

From the *Division of Pediatric Emergency Medicine, Children's Hospital of Michigan, Wayne State University, Detroit; and †Departments of Emergency Medicine and ‡Pediatrics, University of Michigan, Ann Arbor, MI.

Introduction: Empiric parenteral ampicillin has traditionally been used to treat listeria and enterococcal serious bacterial infections (SBI) in neonates 28 days of age or younger. Anecdotal experience suggests that these infections are rare. Existing data suggest an increasing resistance to ampicillin.

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In vitro and in vivo models to study human listeriosis: mind the gap.

Microbes Infect

December 2013

Institut Pasteur, Biology of Infection Unit, 75015 Paris, France; Inserm U1117, 75015 Paris, France.

Listeria monocytogenes (Lm) is the etiological agent of listeriosis, one of the deadliest human foodborne infections. Lm is able to cross the intestinal, placental and blood-brain barriers, leading to septicemia, fetoplacental infection, meningitis and encephalitis. The intracellular life cycle of this facultative intracellular bacterium has been studied in detail in in vitro cell culture systems.

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Listeriolysin O: the Swiss army knife of Listeria.

Trends Microbiol

August 2012

Institut Pasteur, Unité des Interactions Bactéries-Cellules, Département de Biologie Cellulaire et Infection, F-75015 Paris, France.

Listeriolysin O (LLO) is a toxin produced by Listeria monocytogenes, an opportunistic bacterial pathogen responsible for the disease listeriosis. This disease starts with the ingestion of contaminated foods and mainly affects immunocompromised individuals, newborns, and pregnant women. In the laboratory, L.

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