Wang, Jingjin. M.S., Purdue University, May 2014. Characteristics and Practices that May Lead to Listeria monocytogenes Contamination in Retail Delis. Major Professor: Haley F. Oliver. The foodborne pathogen, Listeria monocytogenes, can contaminate ready-to-eat (RTE) deli meats at retail delis, since retail delis provide an ideal environment for L. monocytogenes growth. Current risk assessment ...

Background: Listeria monocytogenes is a Gram-positive and facultative anaerobic food-borne bacterium which is capable of intra and extra cellular growth. L. monocytogenes usually can exist on different surfaces and instruments at production and processing sites of food products with animal origin. In Iran, the consumption of burger has increased recently, but its safety is still of great concer...

Background and Aims: In the current study, two bacteriophages were isolated from the wastewater sources and characterized by lytic activity against the Listeria monocytogenes (L. monocytogenes) bacterium. Materials and Methods:  50 wastewater samples were collected from the disposal sites. The phages were isolated from the treated samples using the double agar overlay method with L. monocytoge...

The present study was undertaken to determine the prevalence of Listeria monocytogenes in selected raw materials and food products of animal origin in Poland. In total, 1118 fish and fish products, and 2172 meat and meat products samples were examined by using ISO culture method. Out of 478 pork samples examined 45 (9.41%) contained L. monocytogenes. Out of the 317 samples of beef the microorga...

Induction of T-cell memory by vaccination ensures long-term protection against pathogens. We determined whether on-going inflammatory responses during vaccination influenced T-cell priming. A preexposure of mice to Mycobacterium bovis BCG impaired their subsequent ability to prime T cells against Listeria monocytogenes. This was characterized by a decrease in L. monocytogenes-specific gamma int...

BACKGROUND Listeria monocytogenes, an intracellular foodborne pathogen, infects immunocompromised hosts. The primary route of transmission is through contaminated food. In the gastrointestinal tract, it traverses the epithelial barrier through intracellular or paracellular routes. Strategies to prevent L. monocytogenes entry can potentially minimize infection in high-risk populations. Listeria ...

The present research was conducted for the isolation and characterization of the Listeria monocytogenes from meat samples collected from different local markets around Mymensingh town such as Boira, Paglar bazar, Kawatkhali bazar, Kamal-Ranjit (K-R) market and Shes More bazar. A total of 36 meat samples were collected from cattle, goat and chicken. After preparation the samples were inoculated ...

Campania's buffalo mozzarella is a greatly appreciated cheese in Italy and worldwide. From a microbiological standpoint, it is a highly perishable food and potentially at risk of contamination by pathogens such as Listeria monocytogenes (L. monocytogenes). The present paper reports the results of a challenge test carried out to assess the population dynamics of L. monocytogenes, alone and in pr...

Listeria monocytogenes is a food-borne bacterial pathogen that causes a wide spectrum of diseases, such as meningitis, septicemia, abortion, and gastroenteritis, in humans and animals. Among the 13 L. monocytogenes serovars described, invasive disease is mostly associated with serovar 4b strains. To investigate the genetic diversity of L. monocytogenes strains with different virulence potential...

Listeria monocytogenes is a Gram positive ubiquitous psychrotrophic bacterium responsible for foodborne infections worldwide. L. monocytogenes is capable of growing at refrigeration temperatures in high salt and acid foods. In this study a response surface methodology was used to determine the effects and interactions of pH (4 to 10), temperature (4 oC to 40 oC) and ozonation time (5 seconds to...