Incidence of Listeria monocytogenes in two milk processing environments, and assessment of Listeria monocytogenes blood agar for isolation

Kells, J. M.; Gilmour, A.

doi:10.1016/s0168-1605(03)00378-7

Cited by 77 publications

(49 citation statements)

References 35 publications

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“…It is frequently found in milk products and processing environments (Kells and Gilmour 2004). Bacteriophages were found to be very effective in reducing the numbers of L. monocytogenes on melon, pear, apple slices, and juices (Oliveira et al 2014).…”

Section: Examples Of Applications Of Bacteriophage As a Biocontrol Agmentioning

confidence: 99%

Bacteriophages: the possible solution to treat infections caused by pathogenic bacteria

El‐Shibiny

El-Sahhar

2017

Can. J. Microbiol.

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Since their discovery in 1915, bacteriophages have been used to treat bacterial infections in animals and humans because of their unique ability to infect their specific bacterial hosts without affecting other bacterial populations. The research carried out in this field throughout the 20th century, largely in Georgia, part of USSR and Poland, led to the establishment of phage therapy protocols. However, the discovery of penicillin and sulfonamide antibiotics in the Western World during the 1930s was a setback in the advancement of phage therapy. The misuse of antibiotics has reduced their efficacy in controlling pathogens and has led to an increase in the number of antibiotic-resistant bacteria. As an alternative to antibiotics, bacteriophages have become a topic of interest with the emergence of multidrug-resistant bacteria, which are a threat to public health. Recent studies have indicated that bacteriophages can be used indirectly to detect pathogenic bacteria or directly as biocontrol agents. Moreover, they can be used to develop new molecules for clinical applications, vaccine production, drug design, and in the nanomedicine field via phage display.Key words: bacteriophages, antibiotics, biocontrol, infection, pathogenesis.Résumé : Les bactériophages ont été utilisés pour traiter des infections bactériennes chez l'animal et l'humain depuis leur découverte en 1915, à cause de leur capacité unique d'infecter leurs hôtes bactériens spécifiques, sans affecter les autres populations bactériennes. La recherche réalisée dans ce domaine au cours du vingtième siècle, principalement en Géorgie, dans une partie de l'URSS et en Pologne, a mené à l'établissement de protocoles thérapeutiques à partir de phages. Cependant, la découverte de la pénicilline et des antibiotiques sulfamidés au cours des années 1930 a retardé l'avancement de la thérapie par les phages. Le mauvais usage des antibiotiques depuis leur découverte a résulté en une augmentation du nombre de bactéries résistantes aux antibiotiques et une réduction de leur efficacité à contrôler d'importants pathogènes. Les bactériophages sont devenus un sujet d'intérêt comme alternative aux antibiotiques avec l'émergence de bactéries multirésistantes qui constituent une menace à la santé publique. Des études récentes ont indiqué que les bactériophages peuvent être utilisés indirectement pour détecter les bactéries pathogènes, ou directement, comme agents de contrôle biologique. De plus, ils peuvent être utilisés pour développer de nouvelles molécules à des fins d'applications cliniques, de production de vaccins, dans la conception de médicaments et dans le domaine de la nanomédecine, par l'exposition sur phage. [Traduit par la Rédaction]

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Section: Examples Of Applications Of Bacteriophage As a Biocontrol Agmentioning

confidence: 99%

Bacteriophages: the possible solution to treat infections caused by pathogenic bacteria

El‐Shibiny

El-Sahhar

2017

Can. J. Microbiol.

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“…including L. monocytogenes is most frequently prevalent in the milk-processing environment including steps, drains and floors [7]. Even though pasteurization of raw milk destroys L. monocytogenes, this process does not eliminate later risk of contamination of dairy products [8].…”

Section: Introductionmentioning

confidence: 99%

Prevalence of Listeria monocytogenes in raw bovine milk and milk products from central highlands of Ethiopia

Seyoum

Woldetsadik

Mekonen

et al. 2015

J Infect Dev Ctries

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Introduction: Listeria monocytogenes is of major significance in human and veterinary medicine. Most human Listeria infections are foodborne and the association of contaminated milk and dairy produce consumption with human listeriosis is noteworthy. In Ethiopia, there is limited data regarding the prevalence of L. monocytogenes in raw bovine milk and dairy products. The aim of this study was, therefore, to determine the prevalence of L. monocytogenes in raw bovine milk and dairy produce. Methodology: A total of 443 milk and milk product samples were microbiologically analyzed following methods recommended by the U.S. Food and Drug Administration Bacteriological Analytical Manual to isolate Listeria spp. Results: The overall prevalence of Listeria spp. was 28.4% and specifically that of L. monocytogenes was 5.6%. Taking the prevalence of Listeria spp. into consideration, cheese was found to be highly contaminated at 60%, followed by pasteurized milk samples (40%), raw milk (18.9%) and yoghurt (5%). Considering the prevalence of Listeria monocytogenes only, raw milk had the lowest contamination while cheese had the highest, followed by pasteurized milk and yoghurt. Conclusions: Raw milk and milk products produced in urban and peri-urban areas of central Ethiopia were contaminated with pathogenic bacteria, L. monocytogenes. The detection of this pathogen in raw milk and milk products warrants an urgent regulatory mechanism to be put in place and also the potential role of milk processing plants in the contamination of dairy products should be investigated.

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“…It can be noticed that the raw materials such as the raw salmon and the poultry meat, which were tested positive for L. monocytogenes, were not contaminated anymore after heat processing. L. monocytogenes is considered to be intolerant to the temperatures achieved during food processing, such as cooking and pasteurization (Kells & Gilmour, 2004). Thus, the intervention processes applied in the food service operation are effective to inactivate the initial contamination.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the food safety management system in a hospital food service operation toward Listeria monocytogenes

et al. 2015

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a b s t r a c tThe unique aspects of a hospital environment, such as the multitude of dietary needs and thus the variety of meals to be served and incoming (raw) materials to be used, challenge the development and application of appropriate control and assurance measures to guarantee food safety. Besides, Listeria monocytogenes is considered a risk for most food service operations producing and serving ready-to-eat foods. Therefore the food safety management system of a hospital food service operation has been evaluated toward L. monocytogenes with an extensive questionnaire in the preset of this case study. In addition, 49 samples of food products and 145 environmental samples were taken and analyzed for L. monocytogenes to verify the implemented control measures. From this case study, it becomes clear that incoming (raw) materials, produced final products and their immediate supply to patients/consumers are high risk situations. This was demonstrated by the presence of L. monocytogenes in six incoming (raw) materials (n ¼ 19) and one final product (n ¼ 9). These risky situations are in need to be mitigated by the implementation of proper control measures, e.g. intensified supplier control, low storage temperatures, cleaning and disinfection to control cross-contamination. However major improvements can be made on the hygienic design of equipment and facilities and on the level of the sampling design. In terms of assurance activities, such as setting up a sampling plan, only a basic level was obtained for the validation and verification of their food safety management system. This case study illustrates that the combination of data from the questionnaire together with data of the sampling result in an overview on the performance of the current food safety management system and that major non-compliances and possibilities for improvement in the system can be defined.

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Incidence of Listeria monocytogenes in two milk processing environments, and assessment of Listeria monocytogenes blood agar for isolation

Cited by 77 publications

References 35 publications

Bacteriophages: the possible solution to treat infections caused by pathogenic bacteria

Bacteriophages: the possible solution to treat infections caused by pathogenic bacteria

Prevalence of Listeria monocytogenes in raw bovine milk and milk products from central highlands of Ethiopia

Evaluation of the food safety management system in a hospital food service operation toward Listeria monocytogenes

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