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Brown P, Hernandez K, Parsons C, Chen Y, Gould N, DePerno CS, Niedermeyer J, Kathariou S. Tetracycline resistance in Listeria monocytogenes and L. innocua from wild black bears ( Ursus americanus) in the United States is mediated by novel transposable elements. Appl Environ Microbiol 2023; 89:e0120523. [PMID: 37888979 PMCID: PMC10686073 DOI: 10.1128/aem.01205-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Accepted: 09/17/2023] [Indexed: 10/28/2023] Open
Abstract
IMPORTANCE Listeria monocytogenes causes severe foodborne illness and is the only human pathogen in the genus Listeria. Previous surveys of AMR in Listeria focused on clinical sources and food or food processing environments, with AMR in strains from wildlife and other natural ecosystems remaining under-explored. We analyzed 185 sequenced strains from wild black bears (Ursus americanus) from the United States, including 158 and 27 L. monocytogenes and L. innocua, respectively. Tetracycline resistance was the most prevalent resistance trait. In L. monocytogenes, it was encountered exclusively in serotype 4b strains with the novel Tn916-like element Tn916.1039. In contrast, three distinct, novel tetracycline resistance elements (Tn5801.UAM, Tn5801.551, and Tn6000.205) were identified in L. innocua. Interestingly, Tn5801.551 was identical to elements in L. monocytogenes from a major foodborne outbreak in the United States in 2011. The findings suggest the importance of wildlife and non-pathogenic Listeria species as reservoir for resistance elements in Listeria.
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Affiliation(s)
- Phillip Brown
- Department of Plant and Microbial Biology, North Carolina State University, Raleigh, North Carolina, USA
| | - Kevin Hernandez
- Department of Food, Bioprocessing and Nutrition Sciences, North Carolina State University, Raleigh, North Carolina, USA
| | - Cameron Parsons
- Department of Food, Bioprocessing and Nutrition Sciences, North Carolina State University, Raleigh, North Carolina, USA
| | - Yi Chen
- Division of Microbiology, Center for Food Safety and Applied Nutrition, Food and Drug Administration, College Park, Maryland, USA
| | - Nicholas Gould
- Fisheries, Wildlife, and Conservation Biology, Department of Forestry and Environmental Resources, North Carolina State University, Raleigh, North Carolina, USA
| | - Christopher S. DePerno
- Fisheries, Wildlife, and Conservation Biology, Department of Forestry and Environmental Resources, North Carolina State University, Raleigh, North Carolina, USA
| | - Jeffrey Niedermeyer
- Department of Food, Bioprocessing and Nutrition Sciences, North Carolina State University, Raleigh, North Carolina, USA
| | - Sophia Kathariou
- Department of Plant and Microbial Biology, North Carolina State University, Raleigh, North Carolina, USA
- Department of Food, Bioprocessing and Nutrition Sciences, North Carolina State University, Raleigh, North Carolina, USA
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Szymczak B. Phenotypic and Genotypic Characteristics of Non-Hemolytic L. monocytogenes Isolated from Food and Processing Environments. Foods 2023; 12:3630. [PMID: 37835283 PMCID: PMC10572806 DOI: 10.3390/foods12193630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 09/25/2023] [Accepted: 09/27/2023] [Indexed: 10/15/2023] Open
Abstract
Increasingly, Listeria monocytogenes (LM) with atypical phenotypic and genotypic characteristics are being isolated from food, causing problems with their classification and testing. From 2495 soil, food, and swab samples from the food industry, 262 LM isolates were found. A total of 30 isolates were isolated, mainly from soil and plant food, and were classified as atypical LM (aLM) because they lacked the ability to move (30/11.4%) and perform hemolysis (25/9.5%). The isolation environment affected aLM incidence, cell size, sugar fermentation capacity, antibiotic sensitivity, and the number of virulence genes. Therefore, despite several characteristics differentiating all aLMs/non-hemolytic isolates from reference LMs, the remaining phenotypic characteristics were specific to each aLM isolate (like a fingerprint). The aLM/non-hemolytic isolates, particularly those from the soil and meat industries, showed more variability in their sugar fermentation capacity and were less sensitive to antibiotics than LMs. As many as 11 (36.7%) aLM isolates had resistance to four different antibiotics or simultaneously to two antibiotics. The aLM isolates possessed 3-7 of the 12 virulence genes: prfA and hly in all aLMs, while iap was not present. Only five (16.7%) isolates were classified into serogroups 1/2c-3c or 4a-4c. The aLM/non-hemolytic isolates differed by many traits from L. immobilis and atypical L. innocua. The reference method of reviving and isolating LM required optimization of aLM. Statistical analyses of clustering, correlation, and PCA showed similarities and differences between LM and aLM/non-hemolytic isolates due to individual phenotypic traits and genes. Correlations were found between biochemical traits, antibiotic resistance, and virulence genes. The increase in the incidence of atypical non-hemolytic LM may pose a risk to humans, as they may not be detected by ISO methods and have greater antibiotic resistance than LM. aLM from LM can be distinguished based on lack of hemolysis, motility, growth at 4 °C, ability to ferment D-arabitol, and lack of six specific genes.
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Affiliation(s)
- Barbara Szymczak
- Department of Applied Microbiology and Human Nutrition Physiology, Faculty of Food Science and Fisheries, West Pomeranian University of Technology, Papieża Pawła VI 3, 71-459 Szczecin, Poland
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Kayode AJ, Okoh AI. Assessment of the molecular epidemiology and genetic multiplicity of Listeria monocytogenes recovered from ready-to-eat foods following the South African listeriosis outbreak. Sci Rep 2022; 12:20129. [PMID: 36418424 PMCID: PMC9684121 DOI: 10.1038/s41598-022-20175-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Accepted: 09/09/2022] [Indexed: 11/24/2022] Open
Abstract
Following the recent listeriosis outbreak in South Africa, this study was carried out to assess the safety level of various common ready-to-eat foods (RTE) obtained from supermarkets and grocery stores in major towns and cities within the Amathole, Chris Hani and Sarah Baartman Districts Municipalities, Eastern Cape Province, South Africa. A sum of 239 food samples was collected from these locations, and Listeria monocytogenes (Lm) was isolated in line with the recommended techniques by the International Organization for Standardization EN ISO 11290:2017 parts 1 and 2. Identification of the pathogen and detection of various associated virulence genes was done using Polymerase Chain Reaction (PCR) techniques. From the RTE food samples processed, Lm was detected in 107 (44.77%) of the samples. Russian sausage was the most contaminated (78.57%), followed by sliced polony (61.90%), muffins (58.33%), polony (52.63%), and pies (52.38%), while all vetkoek samples examined were negative for Lm. Although the prevalence of Lm in the food samples was very high, concentrations were generally < 100 CFU/g. Strains of Lm recovered from the RTE foods were predominantly epidemiological strains belonging to serotypes 1/2a, 1/2b and 4b. The prevalence of 10 virulence genes including the inlA, InlC, inlJ, plcA, hlyA, plcB, prfA, mpl, inlB, and actA were detected among Lm isolates. Most of the isolates (69.07%) demonstrated the potential for biofilm formation and were categorized as weak (14.95%), moderate (13.40%) and strong (40.72) biofilm formers. Furthermore, molecular typing revealed high levels of genetic diversity among Lm isolates. The findings of this investigation suggested that the presence of Lm in the RTE foods may constitute potential threats to the food sector and could pose public health hazards to consumers, particularly the high-risk group of the population. We, therefore, recommend that adequate food monitoring for safety and proper regulation enforcement in the food sector must be ensured to avoid any future listeriosis outbreak that could be linked to RTE foods in South Africa.
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Affiliation(s)
- Adeoye John Kayode
- Applied and Environmental Microbiology Research Group (AEMREG), Department of Biochemistry and Microbiology, University of Fort Hare, Private Bag X1314, Alice, 5700, South Africa.
- SAMRC Microbial Water Quality Monitoring Center, University of Fort Hare, Private Bag X1314, Alice, 5700, South Africa.
| | - Anthony Ifeanyi Okoh
- Applied and Environmental Microbiology Research Group (AEMREG), Department of Biochemistry and Microbiology, University of Fort Hare, Private Bag X1314, Alice, 5700, South Africa
- SAMRC Microbial Water Quality Monitoring Center, University of Fort Hare, Private Bag X1314, Alice, 5700, South Africa
- Department of Environmental Health Sciences, College of Medical and Health Sciences, University of Sharjah, Sharjah, United Arab Emirates
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Raufu IA, Moura A, Vales G, Ahmed OA, Aremu A, Thouvenot P, Tessaud-Rita N, Bracq-Dieye H, Krishnamurthy R, Leclercq A, Lecuit M. Listeria ilorinensis sp. nov., isolated from cow milk cheese in Nigeria. Int J Syst Evol Microbiol 2022; 72. [DOI: 10.1099/ijsem.0.005437] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
During microbial assessment of cow milk cheese products in the city of Ilorin, Nigeria, a
Listeria
-like isolate was detected that could not be assigned to any known species. Whole-genome sequence analyses against all currently known 26
Listeria
species confirmed that this isolate constitutes a new taxon within the genus
Listeria
, with highest similarity to
Listeria costaricensis
(average nucleotide identity blast of 82.66%, in silico DNA–DNA hybridization of 28.3%). Phenotypically, it differs from
L. costaricensis
by the inability to ferment sucrose, l-fucose and starch. The absence of haemolysis and
Listeria
pathogenic islands suggest that this novel species is not pathogenic for humans and animals. The name Listeria ilorinensis sp. nov. is proposed, with the type strain CLIP 2019/01311T (=CIP 111875T=DSM 111566T).
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Affiliation(s)
- Ibrahim Adisa Raufu
- Department of Veterinary Microbiology, University of Ilorin, Ilorin, Nigeria
| | - Alexandra Moura
- Biology of Infection Unit, Institut Pasteur, Université Paris Cité, Inserm U1117, Paris, France
- Institut Pasteur, National Reference Center and WHO Collaborating Center Listeria, Paris, France
| | - Guillaume Vales
- Biology of Infection Unit, Institut Pasteur, Université Paris Cité, Inserm U1117, Paris, France
- Institut Pasteur, National Reference Center and WHO Collaborating Center Listeria, Paris, France
| | | | - Abdulfatai Aremu
- Department of Veterinary Pharmacology and Toxicology, University of Ilorin, Ilorin, Nigeria
| | - Pierre Thouvenot
- Biology of Infection Unit, Institut Pasteur, Université Paris Cité, Inserm U1117, Paris, France
- Institut Pasteur, National Reference Center and WHO Collaborating Center Listeria, Paris, France
| | - Nathalie Tessaud-Rita
- Biology of Infection Unit, Institut Pasteur, Université Paris Cité, Inserm U1117, Paris, France
- Institut Pasteur, National Reference Center and WHO Collaborating Center Listeria, Paris, France
| | - Hélène Bracq-Dieye
- Biology of Infection Unit, Institut Pasteur, Université Paris Cité, Inserm U1117, Paris, France
- Institut Pasteur, National Reference Center and WHO Collaborating Center Listeria, Paris, France
| | - Ramar Krishnamurthy
- C. G. Bhakta Institute of Biotechnology, Uka Tarsadia University, Bardoli, Gujarat State, India
| | - Alexandre Leclercq
- Biology of Infection Unit, Institut Pasteur, Université Paris Cité, Inserm U1117, Paris, France
- Institut Pasteur, National Reference Center and WHO Collaborating Center Listeria, Paris, France
| | - Marc Lecuit
- Biology of Infection Unit, Institut Pasteur, Université Paris Cité, Inserm U1117, Paris, France
- Division of Infectious Diseases and Tropical Medicine, APHP, Institut Imagine, Necker-Enfants Malades University Hospital, Paris, France
- Institut Pasteur, National Reference Center and WHO Collaborating Center Listeria, Paris, France
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Lourenco A, Linke K, Wagner M, Stessl B. The Saprophytic Lifestyle of Listeria monocytogenes and Entry Into the Food-Processing Environment. Front Microbiol 2022; 13:789801. [PMID: 35350628 PMCID: PMC8957868 DOI: 10.3389/fmicb.2022.789801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Accepted: 02/03/2022] [Indexed: 11/13/2022] Open
Abstract
Listeria monocytogenes is an environmentally adapted saprophyte that can change into a human and animal bacterial pathogen with zoonotic potential through several regulatory systems. In this review, the focus is on the occurrence of Listeria sensu stricto and sensu lato in different ecological niches, the detection methods, and their analytical limitations. It also highlights the occurrence of L. monocytogenes genotypes in the environment (soil, water, and wildlife), reflects on the molecular determinants of L. monocytogenes for the saprophytic lifestyle and the potential for antibiotic resistance. In particular, the strain-specific properties with which some genotypes circulate in wastewater, surface water, soil, wildlife, and agricultural environments are of particular interest for the continuously updating risk analysis.
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Affiliation(s)
- Antonio Lourenco
- Department of Food Biosciences, Teagasc Food Research Centre, Co. Cork, Ireland
- Unit for Food Microbiology, Institute for Food Safety, Food Technology and Veterinary Public Health, University of Veterinary Medicine, Vienna, Austria
| | - Kristina Linke
- Unit for Food Microbiology, Institute for Food Safety, Food Technology and Veterinary Public Health, University of Veterinary Medicine, Vienna, Austria
| | - Martin Wagner
- Unit for Food Microbiology, Institute for Food Safety, Food Technology and Veterinary Public Health, University of Veterinary Medicine, Vienna, Austria
- Austrian Competence Center for Feed and Food Quality, Safety and Innovation, Tulln, Austria
| | - Beatrix Stessl
- Unit for Food Microbiology, Institute for Food Safety, Food Technology and Veterinary Public Health, University of Veterinary Medicine, Vienna, Austria
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Carlin CR, Roof S, Wiedmann M. Assessment of Reference Method Selective Broth and Plating Media with 19 Listeria Species Highlights the Importance of Including Diverse Species in Listeria Method Evaluations. J Food Prot 2022; 85:494-510. [PMID: 34855940 DOI: 10.4315/jfp-21-293] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Accepted: 11/30/2021] [Indexed: 11/11/2022]
Abstract
ABSTRACT Reference methods developed for detection of Listeria monocytogenes are commonly used for detection of Listeria at the genus level. Improved method performance data are needed because this genus has expanded from 6 to 26 species and now includes several Listeria sensu lato species, which can have phenotypes distinct from those of Listeria sensu stricto. We evaluated growth of 19 Listeria species, including 12 recently described Listeria sensu lato species, using the media specified by (i) the U.S. Food and Drug Administration (FDA) Bacteriological Analytical Manual, (ii) the U.S. Department of Agriculture (USDA) Microbiology Laboratory Guidebook, and (iii) the International Organization for Standardization (ISO). The FDA broth enrichment procedure allowed all species to grow to detectable levels (≥4 log CFU/mL), yielded the highest mean growth (7.58 log CFU/mL), and was the only procedure with which no Listeria sensu lato species yielded significantly higher growth than did a comparison Listeria sensu stricto species. With the USDA and ISO broth enrichment procedures, several Listeria sensu lato species yielded significantly higher growth than did either Listeria seeligeri or Listeria ivanovii, suggesting that these two Listeria sensu stricto species could be outgrown by Listeria sensu lato species. On selective and differential agar media, L. seeligeri, L. ivanovii, and Listeria grayi produced colonies with atypical morphology and/or growth of these species was inhibited (which may lead to incorrect classification of a sample as negative), whereas several newly described Listeria sensu lato species grew to high levels and produced colonies with typical morphology. Overall, our study results indicate that the ability to detect various Listeria species can be impacted by the specific broth and selective and differential agar used. Our data can help guide selection of appropriate media and detection methods for environmental Listeria monitoring programs and methods that are most likely to detect the targeted Listeria groups (e.g., Listeria sensu stricto, which appear to be the most appropriate index organisms for the pathogen L. monocytogenes). HIGHLIGHTS
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Affiliation(s)
- Catharine R Carlin
- Department of Food Science, College of Agriculture and Life Sciences, Cornell University, Ithaca, New York 14853, USA
| | - Sherry Roof
- Department of Food Science, College of Agriculture and Life Sciences, Cornell University, Ithaca, New York 14853, USA
| | - Martin Wiedmann
- Department of Food Science, College of Agriculture and Life Sciences, Cornell University, Ithaca, New York 14853, USA
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Muñoz AI. Distribution and phenotypic and genotypic characterization of Listeria monocytogenes isolated from food, Colombia, 2010-2018. BIOMEDICA : REVISTA DEL INSTITUTO NACIONAL DE SALUD 2021; 41:165-179. [PMID: 34669287 DOI: 10.7705/biomedica.6152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Indexed: 06/13/2023]
Abstract
Introduction: Listeria monocytogenes is a food-borne pathogen that may cause infections in humans such as meningitis, meningoencephalitis, and septicemia, as well as abortions. By serological typing 13 serotypes have been identified of which 4b is responsible for most of the outbreaks in the world. Objective: To determine the frequency and distribution of serotypes and molecular subtypes of L. monocytogenes isolated in Colombia from food from 2010 to 2018. Materials and methods: We conducted a retrospective and descriptive study based on the analysis of 2,420 isolates confirmed as L. monocytogenes and other species using biochemical and serological tests, and pulsed-field gel electrophoresis (PFGE) for molecular subtyping. Results: Of the 2,420 isolates received, 2,326 were confirmed as L. monocytogenes. The serotypes found were 4b (52%), 4d-4e (14.5%), 1/2a (11%), 1/2c (9.4%), 1/2b (9%), and 3a, 3b, 3c, 4c, 4d, 4e and 7 (less than 2%). The isolates came from Bogotá (43%), Antioquia (25%), Valle (10%), Nariño (9%), and other departments (7%). The genotypic characterization grouped the isolates in 167 PFGE patterns. The most frequent patterns were identified in various dairy and meat products, and in prepared foods. Conclusion: A 96.1% of the isolates corresponded to L. monocytogenes showing good agreement between isolates and identification. Serotype 4b, highly virulent, was the most frequent. The molecular analysis showed the possible dissemination and permanence over time of several serotypes, which highlights the importance of including this pathogen in epidemiological food surveillance programs.
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Affiliation(s)
- Ana Isabel Muñoz
- Instituto Nacional de Vigilancia de Medicamentos y Alimentos, INVIMA, Bogotá, D.C., Colombia.
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