Listeria monocytogenes is not a rare pathogen causing meningitis, mainly in small children and in close contacts to livestock. The pathogen is naturally resistant to cephalosporins and some glycopeptides as well, therefore despite of syndromologic diagnosis of meningitis and initial therapy with 3rd generation cephalosporins according to the guidelines therapeutic failures with clinical consequences may occur.
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Determination of bacteriocin genes and antimicrobial activity of lactiplantibacillus plantarum isolated from Feta cheese samples.
FEMS Microbiol Lett
January 2025
Department of Molecular Biology and Genetics, Science Faculty, Ataturk University, Erzurum, Turkey.
In this study designed to isolate lactic acid bacteria (LAB) with bacteriocin production potential, white cheese samples were collected from different provinces of Turkey and isolation was carried out. A series of experiments were carried out for the main purpose and the actual bacteriocin producers were identified by detecting the genes encoding this bacteriocin. The experiments carried out in this direction were initially carried out with 20 isolates and as a result of various experiments, the number of isolates was reduced to 8 and the study was continued with 8 isolates.
View Article and Find Full Text PDFAnalysis of Method Performance for Quantitative Assessment of Listeria monocytogenes in Queso Fresco Cheese.
J Food Prot
January 2025
QuoData GmbH, Dresden, Germany.
A Proficiency Test (PT) was conducted for Food Emergency Response Network (FERN) laboratories for quantitative assessment of Listeria monocytogenes (L. monocytogenes) in queso fresco cheese. The Moffett Proficiency Test Laboratory: MPTL (organizer) prepared test samples for each participating laboratory with 10 CFU/g of L.
View Article and Find Full Text PDFVirulence expression difference to intestinal cells of different pathogenic Listeria monocytogenes contaminating sausages after simulated digestive tract.
Int J Food Microbiol
January 2025
State Key Laboratory of Meat Quality Control and Cultured Meat Development, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control, College of Food Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu, PR China. Electronic address:
This study investigated the difference in survival among Listeria monocytogenes (LM) 10403S (highly pathogenic strain) and M7 (low pathogenic strain) in sausage under a simulated digestive environment, and established intestinal organoids and macrophages co-culture model to further explore the virulence expression difference to intestinal cells between LM 10403S and M7 after in vitro gastrointestinal digestion. Results showed that, compared with LM M7, LM 10403S exhibited a high survival rate during in vitro digestion, which may be due to the increased expression of stress response-related genes. In addition, the expression of virulence genes in LM 10403S was significantly higher than in LM M7 under the gastrointestinal environment.
View Article and Find Full Text PDFThe prospect of using nanotechnology to prevent and treat infections caused by .
Crit Rev Microbiol
January 2025
Medical Biomaterials Research Center (MBRC), Tehran University of Medical Sciences, Tehran, Iran.
() is an opportunistic intracellular pathogen that causes listeriosis in human and leads to high mortality rate. is resistant to various antibiotics due to its ability to form biofilm. Designing a new generation of antibiotics is a very expensive and time-consuming process.
View Article and Find Full Text PDFApplication of spray-dried bacteriocins as cheese biopreservatives.
Int J Food Microbiol
January 2025
Instituto de Investigaciones para la Industria Química, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de Salta (INIQUI-CONICET-UNSa), Av. Bolivia 5150, A4408FVY Salta, Argentina; Facultad Ciencias de la Salud, Universidad Nacional de Salta (UNSa), Av. Bolivia 5150, A4408FVY Salta, Argentina. Electronic address:
Listeria monocytogenes can contaminate refrigerated ready-to-eat foods, such as cheeses. Enterocins, with a strong listericidal effect, constitute a natural alternative to control this pathogen in food. To optimize their antimicrobial action in food matrices, bacteriocins can be immobilised in edible coatings through spray drying technology which allows the large-scale production of microcapsules of bioactive molecules.
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