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ULUDAĞ AA, ARSLAN AYDOĞDU EÖ, KİMİRAN A. The Determination of Presence of Listeria monocytogenes in Ground Meat Sold in Istanbul. GAZI UNIVERSITY JOURNAL OF SCIENCE 2022. [DOI: 10.35378/gujs.972909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Among the 21 different species of the Listeria genus, Listeria monocytogenes is the most common and listeriosis agent in humans. The mortality rate of L. monocytogenes infection is higher than the other common foodborne pathogens such as Salmonella Enteritidis, Campylobacter and Vibrio species. In the current study, it is aimed to determine the presence of L. monocytogenes bacteria in minced meat samples sold in Istanbul province by using the culture method of the USDA-FSIS. In this study, 100 minced meat samples purchased from different butchers in 11 districts of Istanbul between December 2018 and November 2019 were examined for the presence of L. monocytogenes. The bacteria identified also molecularly verified according to the presence of iap and hlyA gene regions by the polymerase chain reaction (PCR) method. When antibiotic susceptibility tests of 21 strains, identified as L. monocytogenes through biochemical tests, it was found to be resistant to Amoxicillin/Clavulanic acid (14.28%), penicillin (9.52%), cefaclor (9.52%), vancomycin (9.52%), ciprofloxacin (9.52%) and trimethoprim-sulfamethoxazole (9.52%) and susceptible to ampicillin (100%) and tetracycline (100%). In terms of iap and hlyA gene regions, only 16 of 21 isolates, identified as L. monocytogenes as a result of biochemical tests, were found to be L. monocytogenes. In our study with minced meat offered for sale in Istanbul, although, the L. monocytogenes isolation rate (17%) and the incidence of antibiotic resistance of the isolated L. monocytogenes bacteria are low, it was concluded that minced meat may pose a public health risk.
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Affiliation(s)
| | - Elif Özlem ARSLAN AYDOĞDU
- ISTANBUL UNIVERSITY, FACULTY OF SCIENCE, DEPARTMENT OF BIOLOGY, DEPARTMENT OF FUNDAMENTAL AND INDUSTRIAL MICROBIOLOGY
| | - Ayten KİMİRAN
- ISTANBUL UNIVERSITY, FACULTY OF SCIENCE, DEPARTMENT OF BIOLOGY, DEPARTMENT OF FUNDAMENTAL AND INDUSTRIAL MICROBIOLOGY
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Jaber H, Oubihi A, Ouryemchi I, Boulamtat R, Oubayoucef A, Bourkhiss B, Ouhssine M. Chemical Composition and Antibacterial Activities of Eight Plant Essential Oils from Morocco against Escherichia coli Strains Isolated from Different Turkey Organs. Biochem Res Int 2021; 2021:6685800. [PMID: 33859844 PMCID: PMC8009720 DOI: 10.1155/2021/6685800] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2020] [Revised: 03/02/2021] [Accepted: 03/03/2021] [Indexed: 11/22/2022] Open
Abstract
The aim of the present study was to determine the chemical composition of eight plant essential oils and evaluate their antibacterial activity against Escherichia coli strains isolated from different turkey organs. The essential oils were extracted by hydrodistillation and analyzed using gas chromatography-mass spectroscopy. All essential oil yielded high in a range between 2.2 and 3.12%. Gas chromatography-mass spectroscopy (GC-MS) revealed that the major constituents of Thymus vulgaris, Ocimum basilicum, Artemisia herba-alba, and Syzygium aromaticum oils were thymol (41.39%), linalool (37.16%), camphor (63.69%), and eugenol (80.83%), respectively. Results of the E. coli sensitivity evaluated by the standard antimicrobial sensitivity method varied depending on the organ of isolation. Similarly, the essential oils antimicrobial activity determined by the disc diffusion method varied all along within the organs of isolation. T. vulgaris essential oil showed the highest effective antibacterial activity against E. coli isolated from the throat with an inhibition zone diameter value of up to 23.33 mm. However, all the essential oils showed antibacterial activity and the MIC and MBC values were in the range of 1/3000 to 1/100 (v/v) and the ratios MBC/MIC were equal to 1. In conclusion, this study showed that the essential oils could be promising alternatives to overcome E. coli multiresistance in turkey.
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Affiliation(s)
- Hassna Jaber
- Laboratory of Natural Resources and Sustainable Development, Department of Biology, Faculty of Sciences, Ibn Tofail University, Kenitra, Morocco
| | - Asmaa Oubihi
- Laboratory of Natural Resources and Sustainable Development, Department of Biology, Faculty of Sciences, Ibn Tofail University, Kenitra, Morocco
| | - Imane Ouryemchi
- Laboratory of Natural Resources and Sustainable Development, Department of Biology, Faculty of Sciences, Ibn Tofail University, Kenitra, Morocco
| | - Rachid Boulamtat
- Laboratory of Biology and Health, Department of Biology, Faculty of Sciences Ibn Tofail University, Kenitra, Morocco
| | - Ali Oubayoucef
- Laboratory of Biochemistry and Immunology, Department of Biology, Faculty of Sciences Mohamed V University, Rabat, Morocco
| | - Brahim Bourkhiss
- Laboratory of Natural Resources and Sustainable Development, Department of Biology, Faculty of Sciences, Ibn Tofail University, Kenitra, Morocco
| | - Mohammed Ouhssine
- Laboratory of Natural Resources and Sustainable Development, Department of Biology, Faculty of Sciences, Ibn Tofail University, Kenitra, Morocco
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Bouymajane A, Rhazi Filali F, Oulghazi S, Lafkih N, Ed-Dra A, Aboulkacem A, El Allaoui A, Ouhmidou B, Moumni M. Occurrence, antimicrobial resistance, serotyping and virulence genes of Listeria monocytogenes isolated from foods. Heliyon 2021; 7:e06169. [PMID: 33644461 PMCID: PMC7889945 DOI: 10.1016/j.heliyon.2021.e06169] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 06/06/2020] [Accepted: 01/28/2021] [Indexed: 11/23/2022] Open
Abstract
Listeria monocytogenes is a pathogen contaminated food, it is the cause of listeriosis worldwide. The aims of this study were to investigate the occurrence, antimicrobial resistance, serotyping and virulence genes of L. monocytogenes isolated from foods in Meknes city of Morocco. From June 2017 to May 2018, 520 food samples were randomly collected from a traditional market and two overcrowded popular neighborhoods (Lahdim and Hamria) and subjected to the detection of L. monocytogenes. Then, the antimicrobial susceptibility of the isolated strains were evaluated using the standard disk diffusion method and the determination of serotypes and virulence genes was performed by PCR. The results showed the detection of L. monocytogenes in fifteen (2.9%) of 520 samples, including three (5.7%) isolates in traditional whey, raw minced meat and raw sausage, two (3.8%) in raw milk and one (1.9%) in smen (traditional butter), raw bovine meat, raw poultry meat and raw fish, while salads and rayeb (traditional coagulated milk) were not contaminated. Among the fifteen isolated L. monocytogenes, nine (60%) belonged to the serogroup (1/2a, 1/2c, 3a and 3c), two (13.3%) belonged to the serogroup (1/2b, 3b, 4b and 4d) and four (26.6%) do not belong to any studied serogroup. Furthermore, fifteen (100%) isolates showed the presence of actA gene, fourteen (93.3%) harbored hlyA, prfA and plcB genes, thirteen (86.7%) carried inlA and inlC genes and twelve (80%) showed inlJ gene. The antimicrobial susceptibility analysis showed that the isolated strains were more resistant to amoxicillin/clavulanic acid (67.0%), erythromycin (60.0%), sulphamethoxazole (40.0%), ampicillin and sulphamethoxazole/trimethoprim (33.0%) and tetracycline (20.0%). Furthermore, 66.7% (10/15) were multidrug-resistant. From this study, we can conclude that foods marketed in Meknes city were contaminated by multidrug-resistant strains of L. monocytogenes harboring virulence genes, which may cause a serious risk to public health.
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Affiliation(s)
- Aziz Bouymajane
- Team of Microbiology and Health, Laboratory of Chemistry-Biology Applied to the Environment, Moulay Ismail University Faculty of Sciences, BP 11201 Zitoune Meknes, Morocco
| | - Fouzia Rhazi Filali
- Team of Microbiology and Health, Laboratory of Chemistry-Biology Applied to the Environment, Moulay Ismail University Faculty of Sciences, BP 11201 Zitoune Meknes, Morocco
| | - Said Oulghazi
- Cellular Genomics and Molecular Techniques of Investigations, Moulay Ismail University Faculty of Sciences, BP 11201 Zitoune Meknes, Morocco
| | - Nada Lafkih
- Cellular Genomics and Molecular Techniques of Investigations, Moulay Ismail University Faculty of Sciences, BP 11201 Zitoune Meknes, Morocco
| | - Abdelaziz Ed-Dra
- Team of Microbiology and Health, Laboratory of Chemistry-Biology Applied to the Environment, Moulay Ismail University Faculty of Sciences, BP 11201 Zitoune Meknes, Morocco
| | - Amal Aboulkacem
- Regional Laboratory of Epidemiological Diagnosis and Environmental Hygiene, Fez-Meknes, Morocco
| | - Abdallah El Allaoui
- Team of Microbiology and Health, Laboratory of Chemistry-Biology Applied to the Environment, Moulay Ismail University Faculty of Sciences, BP 11201 Zitoune Meknes, Morocco
| | - Bouchra Ouhmidou
- Laboratory of Bioactive Molecules, Structures and Functions, Faculty of Sciences and Technologies, Sidi Mohamed Ben Abdallah University, Fes, Morocco
| | - Mohieddine Moumni
- Cellular Genomics and Molecular Techniques of Investigations, Moulay Ismail University Faculty of Sciences, BP 11201 Zitoune Meknes, Morocco
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Matle I, Mbatha KR, Madoroba E. A review of Listeria monocytogenes from meat and meat products: Epidemiology, virulence factors, antimicrobial resistance and diagnosis. ACTA ACUST UNITED AC 2020; 87:e1-e20. [PMID: 33054262 PMCID: PMC7565150 DOI: 10.4102/ojvr.v87i1.1869] [Citation(s) in RCA: 75] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 08/03/2020] [Accepted: 08/04/2020] [Indexed: 12/13/2022]
Abstract
Listeria monocytogenes is a zoonotic food-borne pathogen that is associated with serious public health and economic implications. In animals, L. monocytogenes can be associated with clinical listeriosis, which is characterised by symptoms such as abortion, encephalitis and septicaemia. In human beings, listeriosis symptoms include encephalitis, septicaemia and meningitis. In addition, listeriosis may cause gastroenteric symptoms in human beings and still births or spontaneous abortions in pregnant women. In the last few years, a number of reported outbreaks and sporadic cases associated with consumption of contaminated meat and meat products with L. monocytogenes have increased in developing countries. A variety of virulence factors play a role in the pathogenicity of L. monocytogenes. This zoonotic pathogen can be diagnosed using both classical microbiological techniques and molecular-based methods. There is limited information about L. monocytogenes recovered from meat and meat products in African countries. This review strives to: (1) provide information on prevalence and control measures of L. monocytogenes along the meat value chain, (2) describe the epidemiology of L. monocytogenes (3) provide an overview of different methods for detection and typing of L. monocytogenes for epidemiological, regulatory and trading purposes and (4) discuss the pathogenicity, virulence traits and antimicrobial resistance profiles of L. monocytogenes.
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Affiliation(s)
- Itumeleng Matle
- Bacteriology Division, Agricultural Research Council - Onderstepoort Veterinary Research, Onderstepoort, Pretoria, South Africa; and, Department of Agriculture and Animal Health, University of South Africa, Science Campus, Florida.
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Yushina Y, Makhova A, Zayko E, Bataeva D. Loop-mediated isothermal amplification (LAMP) for rapid detection of L. monocytogenes in meat. POTRAVINARSTVO 2019. [DOI: 10.5219/1165] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
There is a continued need to develop improved rapid methods for detection of foodborne pathogens. Rapid and sensitive methods for enumeration of Listeria monocytogenes are important for microbiological food safety testing purpose. The aim of this project was to evaluate a commercial loop-mediated isothermal amplification (LAMP) based system with bioluminescence, named as 3M™ Molecular Detection Assay (MDA), was validated for the detection of L. monocytogenes in food products with a standard GOST 32031-2012 method as reference. The results of this study revealed that a commercial LAMP-based method performed equally effective compared with method, showing from 94% to 100% specificity and sensitivity, respectively. The LAMP-based method was shown to be rapid and reliable detection technique for L. monocytogenes present at low numbers (10 CFU.g-1) on raw meat and meat products and can be applicable in meat industry. Thus, compared with the microbiological method based GOST 32031-2012, the LAMP assay is a relatively rapid and highly sensitive method for detecting L. monocytogenes and will facilitate the surveillance for contamination of L. monocytogenes in food. The 3M MDS result and culture-based detection (GOST 32031-2012) did not differ significantly (p >0.05) regarding the number of positive samples.
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Prevalence and Antibiotic Resistance of Listeria monocytogenes Isolated from Ready-to-Eat Foods in Turkey. J FOOD QUALITY 2018. [DOI: 10.1155/2018/7693782] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
The aim of the present study was the determination of the prevalence and antibiotic resistance of L. monocytogenes in ready-to-eat (RTE) foods in Ankara, Turkey. In order to detect and isolate L. monocytogenes from 201 RTE food samples, the EN ISO 11290:1 method was used. All isolates were identified using the polymerase chain reaction. The strains were also confirmed by the detection of the hemolysin gene (hlyA). The overall prevalence of L. monocytogenes was 8.5% among the food samples. Seventeen L. monocytogenes strains were examined by the disk diffusion assay for their resistance to 23 antibiotics. All strains were susceptible to erythromycin, clarithromycin, streptomycin, gentamicin, vancomycin, imipenem, trimethoprim, and chloramphenicol, while all strains were resistant to nalidixic acid, ampicillin, penicillin G, linezolid, and clindamycin. The higher resistance was found against oxacillin (94.1%), kanamycin (76.5%), levofloxacin (70.6%), and teicoplanin (64.7%), followed by amoxicillin/clavulanic acid (53.0%), rifampicin (47.1%), and ciprofloxacin (35.3%). A lower incidence of resistance was observed against tetracycline (5.9%), meropenem (5.9%), and trimethoprim/sulfamethoxazole (17.7%). All isolates were multidrug resistant showing resistance to at least three antibiotic classes. High L. monocytogenes prevalence among analyzed RTE foods represents a high risk for public health. Our findings show a high prevalence of L. monocytogenes in RTE foods in Turkey. More effective control strategies for L. monocytogenes are needed to reduce both prevalence and resistance of L. monocytogenes in Turkish RTE foods.
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Oh H, Kim S, Lee S, Lee H, Ha J, Lee J, Choi Y, Choi KH, Yoon Y. Prevalence, Serotype Diversity, Genotype and Antibiotic Resistance of Listeria monocytogenes Isolated from Carcasses and Human in Korea. Korean J Food Sci Anim Resour 2018; 38:851-865. [PMID: 30479494 PMCID: PMC6238023 DOI: 10.5851/kosfa.2018.e5] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Revised: 05/29/2018] [Accepted: 06/03/2018] [Indexed: 11/22/2022] Open
Abstract
This study investigated the prevalence of Listeria monocytogenes in slaughterhouses, and determined serovars and genotypes, and antibiotic resistance of the isolates obtained from slaughterhouses and humans in Korea. Two hundred ninety samples were collected from feces (n=136), carcasses [n=140 (cattle: n=61, swine: n=79)], and washing water (n=14) in nine slaughterhouses. Eleven human isolates were obtained from hospitals and the Korea Center for Disease Control and Prevention. Listeria monocytogenes was enriched and identified, using polymerase chain reaction (PCR) and 16S rRNA sequencing. Serovars and presence of virulence genes were determined, and genetic correlations among the isolates were evaluated by the restriction digest patterns of AscI. Antibiotic resistance of L. monocytogenes isolates were examined against 12 different antibiotics. Of 290 slaughterhouse samples, 15 (5.17%) carcass samples were L. monocytogenes positive. Most L. monocytogenes isolates possessed all the virulence genes, while polymorphisms in the actA gene were found between carcass and human isolates. Serovars 1/2a (33.3%) and 1/2b (46.7%) were the most frequent in carcass isolates. Genetic correlations among the isolates from carcass and clinical isolates were grouped within serotypes, but there were low geographical correlations. Most L. monocytogenes isolates were antibiotic resistant, and some strains showed resistance to more than four antibiotics. These results indicate that L. monocytogenes are isolated from carcass and human in Korea, and they showed high risk serotypes and antibiotic resistance. Therefore, intensive attentions are necessary to be aware for the risk of L. monocytogenes in Korea.
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Affiliation(s)
- Hyemin Oh
- Department of Food and Nutrition, Sookmyung
Women’s University, Seoul 04310,
Korea
- Risk Analysis Research Center, Sookmyung
Women’s University, Seoul 04310,
Korea
| | - Sejeong Kim
- Department of Food and Nutrition, Sookmyung
Women’s University, Seoul 04310,
Korea
- Risk Analysis Research Center, Sookmyung
Women’s University, Seoul 04310,
Korea
| | - Soomin Lee
- Department of Food and Nutrition, Sookmyung
Women’s University, Seoul 04310,
Korea
- Risk Analysis Research Center, Sookmyung
Women’s University, Seoul 04310,
Korea
| | - Heeyoung Lee
- Department of Food and Nutrition, Sookmyung
Women’s University, Seoul 04310,
Korea
- Risk Analysis Research Center, Sookmyung
Women’s University, Seoul 04310,
Korea
| | - Jimyeong Ha
- Department of Food and Nutrition, Sookmyung
Women’s University, Seoul 04310,
Korea
- Risk Analysis Research Center, Sookmyung
Women’s University, Seoul 04310,
Korea
| | - Jeeyeon Lee
- Department of Food and Nutrition, Sookmyung
Women’s University, Seoul 04310,
Korea
- Risk Analysis Research Center, Sookmyung
Women’s University, Seoul 04310,
Korea
| | - Yukyung Choi
- Department of Food and Nutrition, Sookmyung
Women’s University, Seoul 04310,
Korea
- Risk Analysis Research Center, Sookmyung
Women’s University, Seoul 04310,
Korea
| | - Kyoung-Hee Choi
- Department of Oral Microbiology, College of
Dentistry, Wonkwang University, Iksan 54538,
Korea
| | - Yohan Yoon
- Department of Food and Nutrition, Sookmyung
Women’s University, Seoul 04310,
Korea
- Risk Analysis Research Center, Sookmyung
Women’s University, Seoul 04310,
Korea
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Heidarzadeh S, Dallal MMS, Pourmand MR, Pirjani R, Foroushani AR, Noori M, Naseri AB. Prevalence, antimicrobial susceptibility, serotyping and virulence genes screening of Listeria monocytogenes strains at a tertiary care hospital in Tehran, Iran. IRANIAN JOURNAL OF MICROBIOLOGY 2018; 10:307-313. [PMID: 30675327 PMCID: PMC6340003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
BACKGROUND AND OBJECTIVES Listeria monocytogenes is the etiological agent of listeriosis, a highly fatal infection which causes miscarriage or stillbirth in pregnant women. The objective of this study was to detect the prevalence, serotypes, antimicrobial susceptibility and virulence factors of L. monocytogenes isolated from pregnant women with vaginitis at a tertiary care hospital in Tehran, Iran. MATERIALS AND METHODS During September 2015 to February 2017, a total of 400 vaginal swabs were collected from pregnant women. The presumptive isolates were characterized biochemically. All L. monocytogenes isolates were further analyzed by serotyping and antimicrobial susceptibility tests. All positive samples for L. monocytogenes were analyzed for presence of virulence genes (hlyA, actA, inlA, inlC, inlJ and prfA). RESULTS Twenty-two (5.5%) of the samples were found positive for presence of L. monocytogenes. Most isolates are resistant to trimethoprim/sulfamethoxazole (81.82%) and chloramphenicol (54.55%). The majority of tested isolates (59.10%) belonged to serotype 4b, followed by 1/2a (22.73%), 1/2b (13.63%), and 3c (4.54%). The hlyA, actA and inlA were detected in all of the 22 L. monocytogenes isolates, but two, three and five isolates were found to lack inlC, inlJ and prfA, respectively. Only one isolate lacked three inlC, inlJ and prfA genes, and two isolates simultaneously lacked both inlJ and prfA genes. CONCLUSION Evaluation of virulence factors and antimicrobial susceptibility can be highly helpful to develop effective treatment strategies against L. monocytogenes infections. This study is noteworthy in that it documents prevalence, virulence characteristics, and antimicrobial resistance of L. monocytogenes.
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Affiliation(s)
- Siamak Heidarzadeh
- Department of Pathobiology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran,Department of Microbiology and Virology, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Mohammad Mehdi Soltan Dallal
- Department of Pathobiology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran,Food Microbiology Research Center, Tehran University of Medical Sciences, Tehran, Iran,Corresponding author: Mohammad Mehdi Soltan Dallal, Ph.D, Department of Pathobiology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran; Food Microbiology Research Center, Tehran University of Medical Sciences, Tehran, Iran. Tel/fax: 021-88954910,
| | - Mohammad Reza Pourmand
- Department of Pathobiology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Reihaneh Pirjani
- Department of Obstetrics & Gynecology, Arash Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Abbas Rahimi Foroushani
- Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Matina Noori
- Department of Obstetrics & Gynecology, Arash Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Aida Babazadeh Naseri
- Food Microbiology Research Center, Tehran University of Medical Sciences, Tehran, Iran
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ISHOLA O, MOSUGU J, ADESOKAN H. Prevalence and antibiotic susceptibility profiles of Listeria monocytogenes contamination of chicken flocks and meat in Oyo State, south-western Nigeria: Public health implications. JOURNAL OF PREVENTIVE MEDICINE AND HYGIENE 2016; 57:E157-E163. [PMID: 27980380 PMCID: PMC5139611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 07/22/2016] [Indexed: 11/02/2022]
Abstract
INTRODUCTION Food contamination with Listeria monocytogenes is on the increase posing threats to public health with growing trends in food products recalls due to suspected Listeria contamination. METHODS We conducted a cross-sectional study to determine the prevalence and antibiotic susceptibility profiles of Listeria monocytogenes (Lm) among 71 randomly selected poultry farms in Oyo State, Nigeria. A total of 450 samples comprising cloacal swabs (426) and randomly selected dressed chicken meat (24) were cultured for Lm isolation using BrillianceTM Selective Listeria Agar with antibiotics and microbial load count with Nutrient Agar. Further identification was done using microscopic, biochemical characterization and antibiotic sensitivity tests. Data were analysed using bivariate analysis and student t-test. RESULTS An overall prevalence of 91.8% Lm contamination was obtained comprising 91.5% (390/426) in cloacal swabs and 95.8% (23/24) in meat. The prevalence of Lm in cloacal samples was significantly associated with poultry type (p = 0.008) and breed (p = 0.000. In addition, all the flocks had at least one positive sample yielding 100% flock prevalence. Antibiotic sensitivity test revealed that most of the isolates were resistant to common antibiotics like Ampicillin-cloxacillin and cefuroxime. CONCLUSIONS The results revealed a high level of contamination with Lm in the poultry flock and meat and the observed resistance to most common antibiotics has implications for future disease control as well as public health. There is need to step up routine screening of food animal products for Listeria contamination as well as measures towards reducing such contaminations.
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Affiliation(s)
- O.O. ISHOLA
- Department of Veterinary Public Health and Preventive Medicine, University of Ibadan, Nigeria
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Kim S, Lee H, Lee S, Yoon Y, Choi KH. Antimicrobial action of oleanolic acid on Listeria monocytogenes, Enterococcus faecium, and Enterococcus faecalis. PLoS One 2015; 10:e0118800. [PMID: 25756202 PMCID: PMC4355482 DOI: 10.1371/journal.pone.0118800] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Accepted: 01/06/2015] [Indexed: 01/11/2023] Open
Abstract
This study investigated the antimicrobial action of oleanolic acid against Listeria monocytogenes, Enterococcus faecium, and Enterococcus faecalis. To determine the cytotoxicity of oleanolic acid, HEp-2 cells were incubated with oleanolic acid at 37oC. MICs (minimal inhibition concentrations) for L. monocytogenes, E. faecium, and E. faecalis were determined using two-fold microdilutions of oleanolic acid, and bacterial cell viability was then assessed by exposing the bacteria to oleanolic acid at 2 × MIC. To investigate the mode of antimicrobial action of oleanolic acid, we measured leakage of compounds absorbing at 280 nm, along with propidium iodide uptake. Scanning electron microscope (SEM) images were also analysed. The viability of HEp-2 cells decreased (P < 0.05) at oleanolic acid concentrations greater than 128 μg mL-1. The MICs were 16-32 μg mL-1 for L. monocytogenes and 32-64 μg mL-1 for E. faecium and E. faecalis, and bacterial cell viability decreased (P < 0.05) about 3-4 log CFU mL-1 after exposure to 2 × MIC of oleanolic acid. Leakage of 280 nm absorbing materials and propidium iodide uptake was higher in oleanolic acid –treated cells than in the control. The cell membrane was damaged in oleanolic acid-treated cells, but the control group had intact cell membrane in SEM images. The results indicate that oleanolic acid can kill L. monocytogenes, E. faecium, and E. faecalis by destroying the bacterial cell membrane.
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Affiliation(s)
- Sejeong Kim
- Department of Food and Nutrition, Sookmyung Women's University, Seoul, Korea
| | - Heeyoung Lee
- Department of Food and Nutrition, Sookmyung Women's University, Seoul, Korea
| | - Soomin Lee
- Department of Food and Nutrition, Sookmyung Women's University, Seoul, Korea
| | - Yohan Yoon
- Department of Food and Nutrition, Sookmyung Women's University, Seoul, Korea
- * E-mail: (YY); (KHC)
| | - Kyoung-Hee Choi
- Department of Oral Microbiology, College of Dentistry, Wonkwang University, Iksan, Jeonbuk, South Korea
- * E-mail: (YY); (KHC)
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