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Kim SY, An D, Jeong H, Kim J. Antimicrobial Susceptibility Patterns and Genetic Diversity of Campylobacter spp. Isolates from Patients with Diarrhea in South Korea. Microorganisms 2024; 12:94. [PMID: 38257921 PMCID: PMC10819060 DOI: 10.3390/microorganisms12010094] [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: 11/20/2023] [Revised: 12/18/2023] [Accepted: 12/19/2023] [Indexed: 01/24/2024] Open
Abstract
This study aimed to characterize the latest antimicrobial resistance patterns and genetic diversity of Campylobacter spp. isolated from patients with acute diarrhea in Korea. In total, 371 clinical isolates (361 Campylobacter jejuni and 10 Campylobacter coli) were collected from patients with diarrhea in 106 medical institutions of six provinces during the seasonal peak (April-September 2022) in South Korea. We then assessed their antimicrobial susceptibility to eight antimicrobial agents and performed multilocus sequence typing (MLST). This study investigated the antimicrobial resistance (AMR) profiles to tetracycline (32.3%), nalidixic acid (64.9%), and ciprofloxacin (83.3%), confirming high levels of the latter even after its Korean ban in 2010. However, tetracycline resistance displayed a decreasing trend. Alternatively, significantly lower resistance rates to clindamycin (0.8%), azithromycin (0.53%), erythromycin (0.53%), and gentamicin (0.53%) as well as absolute susceptibility to florfenicol (0%) were observed. Four C. jejuni and three C. coli isolates (7/371, 1.88%) were classified as multidrug-resistant (MDR) to at least three antimicrobial classes. MLST identified a high genetic diversity with 21 clonal complexes (CCs) and sixty-six sequence types (STs), including eight novel STs. The high CC frequency of C. jejuni comprised CC21 (37.7%), CC22 (13.8%), and CC206 (9.4%), while C. coli was predominated by CC828 (90%). The high CC21 and CC828 strain prevalence in this study was consistent with their worldwide distribution. This study highlights that quinolone- and tetracycline-resistant Campylobacter circulate in Korea with diverse genotypes, providing important information that could contribute to controlling and preventing increasing antimicrobial resistance in patients.
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Affiliation(s)
- So Yeon Kim
- Division of Zoonotic and Vector-Borne Disease Research, Center for Infectious Diseases Research, Korea National Institute of Health, Cheongju 28160, Republic of Korea;
| | - Dongheui An
- Division of Clinical Microbiology, Department of Laboratory Medicine, Seegene Medical Foundation, Seoul 04805, Republic of Korea; (D.A.); (H.J.)
| | - Hyemi Jeong
- Division of Clinical Microbiology, Department of Laboratory Medicine, Seegene Medical Foundation, Seoul 04805, Republic of Korea; (D.A.); (H.J.)
| | - Jonghyun Kim
- Division of Zoonotic and Vector-Borne Disease Research, Center for Infectious Diseases Research, Korea National Institute of Health, Cheongju 28160, Republic of Korea;
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2
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Yan R, M'ikanatha NM, Nachamkin I, Hudson LK, Denes TG, Kovac J. Prevalence of ciprofloxacin resistance and associated genetic determinants differed among Campylobacter isolated from human and poultry meat sources in Pennsylvania. Food Microbiol 2023; 116:104349. [PMID: 37689423 DOI: 10.1016/j.fm.2023.104349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Revised: 07/29/2023] [Accepted: 07/31/2023] [Indexed: 09/11/2023]
Abstract
Poultry is the primary source of Campylobacter infections and severe campylobacteriosis cases are treated with macrolides and fluoroquinolones. However, these drugs are less effective against antimicrobial-resistant strains. Here, we investigated the prevalence of phenotypic antimicrobial resistance and associated resistance genetic determinants in Campylobacter isolates collected from human clinical (N = 123) and meat (N = 80) sources in Pennsylvania in 2017 and 2018. Our goal was to assess potential differences in the prevalence of antimicrobial resistance in Campylobacter isolated from human and poultry meat sources in Pennsylvania and to assess the accuracy of predicting antimicrobial resistance phenotypes based on resistance genotypes. We whole genome sequenced isolates and identified genetic resistance determinants using the National Antimicrobial Resistance Monitoring System Campylobacter AMR workflow v2.0 in GalaxyTrakr. Phenotypic antimicrobial susceptibility testing was carried out using the E-Test and Sensititre CAMPYCMV methods for human clinical and poultry meat isolates, respectively, and the results were interpreted using the EUCAST epidemiological cutoff values. The 193 isolates were represented by 85 MLST sequence types and 23 clonal complexes, suggesting high genetic diversity. Resistance to erythromycin was confirmed in 6% human and 4% meat isolates. Prevalence of ciprofloxacin resistance was significantly higher in human isolates as compared to meat isolates. A good concordance was observed between phenotypic resistance and the presence of the corresponding known resistance genetic determinants.
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Affiliation(s)
- Runan Yan
- Department of Food Science, The Pennsylvania State University, University Park, PA, 16802, USA
| | | | - Irving Nachamkin
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Lauren K Hudson
- Department of Food Science, University of Tennessee, Knoxville, TN, 37996, USA
| | - Thomas G Denes
- Department of Food Science, University of Tennessee, Knoxville, TN, 37996, USA
| | - Jasna Kovac
- Department of Food Science, The Pennsylvania State University, University Park, PA, 16802, USA.
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3
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Ramić D, Jug B, Šimunović K, Tušek Žnidarič M, Kunej U, Toplak N, Kovač M, Fournier M, Jamnik P, Smole Možina S, Klančnik A. The Role of luxS in Campylobacter jejuni Beyond Intercellular Signaling. Microbiol Spectr 2023; 11:e0257222. [PMID: 36722966 PMCID: PMC10100756 DOI: 10.1128/spectrum.02572-22] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Accepted: 01/07/2023] [Indexed: 02/02/2023] Open
Abstract
The full role of the luxS gene in the biological processes, such as essential amino acid synthesis, nitrogen and pyruvate metabolism, and flagellar assembly, of Campylobacter jejuni has not been clearly described to date. Therefore, in this study, we used a comprehensive approach at the cellular and molecular levels, including transcriptomics and proteomics, to investigate the key role of the luxS gene and compared C. jejuni 11168ΔluxS (luxS mutant) and C. jejuni NCTC 11168 (wild type) strains. Transcriptomic analysis of the luxS mutant grown under optimal conditions revealed upregulation of luxS mutant metabolic pathways when normalized to wild type, including oxidative phosphorylation, carbon metabolism, citrate cycle, biosynthesis of secondary metabolites, and biosynthesis of various essential amino acids. Interestingly, induction of these metabolic pathways was also confirmed by proteomic analysis, indicating their important role in energy production and the growth of C. jejuni. In addition, genes important for the stress response of C. jejuni, including nutrient starvation and oxidative stress, were upregulated. This was also evident in the better survival of the luxS mutant under starvation conditions than the wild type. At the molecular level, we confirmed that metabolic pathways were upregulated under optimal conditions in the luxS mutant, including those important for the biosynthesis of several essential amino acids. This also modulated the utilization of various carbon and nitrogen sources, as determined by Biolog phenotype microarray analysis. In summary, transcriptomic and proteomic analysis revealed key biological differences in tricarboxylic acid (TCA) cycle, pyruvate, nitrogen, and thiamine metabolism as well as lipopolysaccharide biosynthesis in the luxS mutant. IMPORTANCE Campylobacter jejuni is the world's leading foodborne bacterial pathogen of gastrointestinal disease in humans. C. jejuni is a fastidious but widespread organism and the most frequently reported zoonotic pathogen in the European Union since 2005. This led us to believe that C. jejuni, which is highly sensitive to stress factors (starvation and oxygen concentration) and has a low growth rate, benefits significantly from the luxS gene. The role of this gene in the life cycle of C. jejuni is well known, and the expression of luxS regulates many phenotypes, including motility, biofilm formation, host colonization, virulence, autoagglutination, cellular adherence and invasion, oxidative stress, and chemotaxis. Surprisingly, this study confirmed for the first time that the deletion of the luxS gene strongly affects the central metabolic pathway of C. jejuni, which improves its survival, showing its role beyond the intercellular signaling system.
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Affiliation(s)
- Dina Ramić
- Department of Food Science and Technology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Blaž Jug
- Department of Food Science and Technology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Katarina Šimunović
- Department of Food Science and Technology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
- Department of Microbiology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Magda Tušek Žnidarič
- Department of Biotechnology and System Biology, National institute of Biology, Ljubljana, Slovenia
| | - Urban Kunej
- Department of Agronomy, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | | | | | - Marjorie Fournier
- Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom
| | - Polona Jamnik
- Department of Food Science and Technology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Sonja Smole Možina
- Department of Food Science and Technology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Anja Klančnik
- Department of Food Science and Technology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
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4
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dessouky YE, Elsayed SW, Abdelsalam NA, Saif NA, Álvarez-Ordóñez A, Elhadidy M. Genomic insights into zoonotic transmission and antimicrobial resistance in Campylobacter jejuni from farm to fork: a one health perspective. Gut Pathog 2022; 14:44. [PMID: 36471447 PMCID: PMC9721040 DOI: 10.1186/s13099-022-00517-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Accepted: 11/08/2022] [Indexed: 12/09/2022] Open
Abstract
BACKGROUND Campylobacteriosis represents a global public health threat with various socio-economic impacts. Among different Campylobacter species, Campylobacter jejuni (C. jejuni) is considered to be the foremost Campylobacter species responsible for most of gastrointestinal-related infections. Although these species are reported to primarily inhabit birds, its high genetic and phenotypic diversity allowed their adaptation to other animal reservoirs and to the environment that may impact on human infection. MAIN BODY A stringent and consistent surveillance program based on high resolution subtyping is crucial. Recently, different epidemiological investigations have implemented high-throughput sequencing technologies and analytical pipelines for higher resolution subtyping, accurate source attribution, and detection of antimicrobial resistance determinants among these species. In this review, we aim to present a comprehensive overview on the epidemiology, clinical presentation, antibiotic resistance, and transmission dynamics of Campylobacter, with specific focus on C. jejuni. This review also summarizes recent attempts of applying whole-genome sequencing (WGS) coupled with bioinformatic algorithms to identify and provide deeper insights into evolutionary and epidemiological dynamics of C. jejuni precisely along the farm-to-fork continuum. CONCLUSION WGS is a valuable addition to traditional surveillance methods for Campylobacter. It enables accurate typing of this pathogen and allows tracking of its transmission sources. It is also advantageous for in silico characterization of antibiotic resistance and virulence determinants, and hence implementation of control measures for containment of infection.
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Affiliation(s)
- Yara El dessouky
- grid.440881.10000 0004 0576 5483Biomedical Sciences Program, University of Science and Technology, Zewail City of Science and Technology, Giza, Egypt ,grid.440881.10000 0004 0576 5483Center for Genomics, Helmy Institute for Medical Sciences, Zewail City of Science and Technology, Giza, Egypt
| | - Salma W. Elsayed
- grid.440881.10000 0004 0576 5483Biomedical Sciences Program, University of Science and Technology, Zewail City of Science and Technology, Giza, Egypt ,grid.440881.10000 0004 0576 5483Center for Genomics, Helmy Institute for Medical Sciences, Zewail City of Science and Technology, Giza, Egypt ,grid.7269.a0000 0004 0621 1570Department of Microbiology and Immunology, Faculty of Pharmacy, Ain Shams University, Cairo, Egypt
| | - Nehal Adel Abdelsalam
- grid.440881.10000 0004 0576 5483Biomedical Sciences Program, University of Science and Technology, Zewail City of Science and Technology, Giza, Egypt ,grid.440881.10000 0004 0576 5483Center for Genomics, Helmy Institute for Medical Sciences, Zewail City of Science and Technology, Giza, Egypt ,grid.7776.10000 0004 0639 9286Department of Microbiology and Immunology, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Nehal A. Saif
- grid.440881.10000 0004 0576 5483Biomedical Sciences Program, University of Science and Technology, Zewail City of Science and Technology, Giza, Egypt ,grid.440881.10000 0004 0576 5483Center for Genomics, Helmy Institute for Medical Sciences, Zewail City of Science and Technology, Giza, Egypt
| | - Avelino Álvarez-Ordóñez
- grid.4807.b0000 0001 2187 3167Department of Food Hygiene and Technology and Institute of Food Science and Technology, Universidad de León, León, Spain
| | - Mohamed Elhadidy
- grid.440881.10000 0004 0576 5483Biomedical Sciences Program, University of Science and Technology, Zewail City of Science and Technology, Giza, Egypt ,grid.440881.10000 0004 0576 5483Center for Genomics, Helmy Institute for Medical Sciences, Zewail City of Science and Technology, Giza, Egypt ,grid.10251.370000000103426662Department of Bacteriology, Mycology and Immunology, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt
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5
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Veltcheva D, Colles FM, Varga M, Maiden MCJ, Bonsall MB. Emerging patterns of fluoroquinolone resistance in Campylobacter jejuni in the UK [1998-2018]. Microb Genom 2022; 8. [PMID: 36155645 DOI: 10.1099/mgen.0.000875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Campylobacter jejuni (C.jejuni) is the most common causative agent of bacterial food poisoning worldwide and is known to be genetically highly diverse. C. jejuni is increasingly resistant to fluoroquinolone antibiotics, but very few studies have investigated variant-specific patterns of resistance across time. Here we use statistical modelling and clustering techniques to investigate patterns of fluoroquinolone resistance amongst 10,359 UK isolates from human disease sampled over 20 years. We observed six distinct patterns of fluoroquinolone sensitivity/resistance in C. jejuni across time, grouping by clonal complex (CC). Some CCs were fully resistant, some shifted from susceptible to resistant following a sigmoidal shape, and some remained susceptible over time. Our findings indicate that the fluoroquinolone resistance patterns of C. jejuni are complicated and cannot be analysed as a single species but divided into variant dynamics so that the factors driving resistance can be thoroughly investigated.
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Wang X, Zhuo Q, Hong Y, Wu Y, Gu Q, Yuan D, Dong Q, Shao J. Correlation between Multilocus Sequence Typing and Antibiotic Resistance, Virulence Potential of Campylobacter jejuni Isolates from Poultry Meat. Foods 2022; 11:foods11121768. [PMID: 35741967 PMCID: PMC9222796 DOI: 10.3390/foods11121768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Revised: 05/30/2022] [Accepted: 06/11/2022] [Indexed: 12/10/2022] Open
Abstract
Campylobacter jejuni is a major foodborne pathogen and can be transmitted to human beings via the consumption of poultry products. This study aimed to determine antibiotic resistance and virulence potential of one hundred C. jejuni isolates from poultry meat and to explore the correlation between them and the multilocus sequence types (MLST). A total of 29 STs and 13 CCs were identified by MLST, of which 8 STs were first identified. The dominant ST was ST583 (21%), followed by ST42 (15%), ST61 (12%), and ST2276 (10%). Eighty-eight isolates showed resistance to at least one antibiotic. The resistance rate to fluoroquinolones was the highest (81%), followed by tetracycline (59%), whereas all the isolates were susceptible to erythromycin and telithromycin. Multi-antibiotic resistance was detected in 18 C. jejuni isolates. Great variability in the adhesion and invasion ability to Caco-2 cells was observed for the 100 isolates, with adhesion rates varying between 0.02% and 28.48%, and invasion rates varied from 0 to 6.26%. A correlation between STs and antibiotic resistance or virulence was observed. The ST61 isolates were significantly sensitive to CIP, while the TET resistance was significantly associated with ST354 and ST6175 complex. ST11326 showed substantially higher resistance to gentamicin and higher adhesion and invasion abilities to Caco-2 cells. The results helped improve our understanding of the potential hazard of different genotypes C. jejuni and provided critical information for the risk assessment of campylobacteriosis infection.
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Affiliation(s)
- Xiang Wang
- School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; (X.W.); (Q.Z.); (Y.H.); (Q.D.)
| | - Qiyun Zhuo
- School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; (X.W.); (Q.Z.); (Y.H.); (Q.D.)
| | - Yi Hong
- School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; (X.W.); (Q.Z.); (Y.H.); (Q.D.)
| | - Yufan Wu
- Centre of Analysis and Test, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China
- Technology Center of Zhangjiagang Customs, Suzhou 215600, China; (Q.G.); (D.Y.)
- Correspondence: (Y.W.); (J.S.); Tel.: +86-21-64252849 (Y.W.); +86-512-56302785 (J.S.)
| | - Qiang Gu
- Technology Center of Zhangjiagang Customs, Suzhou 215600, China; (Q.G.); (D.Y.)
| | - Dawei Yuan
- Technology Center of Zhangjiagang Customs, Suzhou 215600, China; (Q.G.); (D.Y.)
| | - Qingli Dong
- School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; (X.W.); (Q.Z.); (Y.H.); (Q.D.)
| | - Jingdong Shao
- Technology Center of Zhangjiagang Customs, Suzhou 215600, China; (Q.G.); (D.Y.)
- Correspondence: (Y.W.); (J.S.); Tel.: +86-21-64252849 (Y.W.); +86-512-56302785 (J.S.)
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7
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Tenhagen BA, Flor M, Alt K, Knüver MT, Buhler C, Käsbohrer A, Stingl K. Association of Antimicrobial Resistance in Campylobacter spp. in Broilers and Turkeys with Antimicrobial Use. Antibiotics (Basel) 2021; 10:antibiotics10060673. [PMID: 34199987 PMCID: PMC8227418 DOI: 10.3390/antibiotics10060673] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 05/27/2021] [Accepted: 05/29/2021] [Indexed: 11/16/2022] Open
Abstract
We investigated trends in antimicrobial resistance (AMR) in Campylobacter jejuni and Campylobacter coli in poultry between 2010 and 2016 in Germany and their association with antimicrobial use. Campylobacter had been isolated from the caeca of broilers and turkeys at slaughter by regional laboratories according to current ISO methods in the framework of a national monitoring program. Isolates were submitted to the National Reference Laboratory for Campylobacter and tested for AMR using broth microdilution methods. Minimum inhibitory concentrations were evaluated according to epidemiological cut-off values. Antimicrobial use (AMU) data from 2014 to 2016 were taken from a government report. AMR was higher in C. coli than in C. jejuni and higher in turkeys than in broilers. AMR was highest to tetracycline and the tested (fluoro)quinolones while it was rare to gentamicin in both bacterial species, infrequent to erythromycin in C. jejuni, and moderate in C. coli. AMR to tetracycline and erythromycin decreased over time while it increased to (fluoro)quinolones. An association of AMU and AMR was observed for resistance to tetracycline and erythromycin, while it was not observed for the aminoglycosides. Resistance to nalidixic acid and ciprofloxacin increased despite a decrease of fluoroquinolone use between 2014 and 2016, indicating that other factors have a strong influence on resistance to (fluoro)quinolones in Campylobacter.
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Affiliation(s)
- Bernd-Alois Tenhagen
- Unit Epidemiology, Zoonoses and Antimicrobial Resistance, Department Biological Safety, German Federal Institute for Risk Assessment, Max-Dohrn-Str. 8–10, 10589 Berlin, Germany; (M.F.); (K.A.); (A.K.)
- Correspondence: ; Tel.: +49-301841224301
| | - Matthias Flor
- Unit Epidemiology, Zoonoses and Antimicrobial Resistance, Department Biological Safety, German Federal Institute for Risk Assessment, Max-Dohrn-Str. 8–10, 10589 Berlin, Germany; (M.F.); (K.A.); (A.K.)
| | - Katja Alt
- Unit Epidemiology, Zoonoses and Antimicrobial Resistance, Department Biological Safety, German Federal Institute for Risk Assessment, Max-Dohrn-Str. 8–10, 10589 Berlin, Germany; (M.F.); (K.A.); (A.K.)
| | - Marie-Theres Knüver
- Unit Food Microbiology, Pathogen-Host Interactions, Department Biological Safety, German Federal Institute for Risk Assessment, Max-Dohrn-Str. 8–10, 10589 Berlin, Germany; (M.-T.K.); (C.B.); (K.S.)
| | - Christiane Buhler
- Unit Food Microbiology, Pathogen-Host Interactions, Department Biological Safety, German Federal Institute for Risk Assessment, Max-Dohrn-Str. 8–10, 10589 Berlin, Germany; (M.-T.K.); (C.B.); (K.S.)
| | - Annemarie Käsbohrer
- Unit Epidemiology, Zoonoses and Antimicrobial Resistance, Department Biological Safety, German Federal Institute for Risk Assessment, Max-Dohrn-Str. 8–10, 10589 Berlin, Germany; (M.F.); (K.A.); (A.K.)
| | - Kerstin Stingl
- Unit Food Microbiology, Pathogen-Host Interactions, Department Biological Safety, German Federal Institute for Risk Assessment, Max-Dohrn-Str. 8–10, 10589 Berlin, Germany; (M.-T.K.); (C.B.); (K.S.)
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Abstract
Thermophilic Campylobacter, in particular Campylobacter jejuni, C. coli and C. lari are the main relevant Campylobacter species for human infections. Due to their high capacity of genetic exchange by horizontal gene transfer (HGT), rapid adaptation to changing environmental and host conditions contribute to successful spreading and persistence of these foodborne pathogens. However, extensive HGT can exert dangerous side effects for the bacterium, such as the incorporation of gene fragments leading to disturbed gene functions. Here we discuss mechanisms of HGT, notably natural transformation, conjugation and bacteriophage transduction and limiting regulatory strategies of gene transfer. In particular, we summarize the current knowledge on how the DNA macromolecule is exchanged between single cells. Mechanisms to stimulate and to limit HGT obviously coevolved and maintained an optimal balance. Chromosomal rearrangements and incorporation of harmful mutations are risk factors for survival and can result in drastic loss of fitness. In Campylobacter, the restricted recognition and preferential uptake of free DNA from relatives are mediated by a short methylated DNA pattern and not by a classical DNA uptake sequence as found in other bacteria. A class two CRISPR-Cas system is present but also other DNases and restriction-modification systems appear to be important for Campylobacter genome integrity. Several lytic and integrated bacteriophages have been identified, which contribute to genome diversity. Furthermore, we focus on the impact of gene transfer on the spread of antibiotic resistance genes (resistome) and persistence factors. We discuss remaining open questions in the HGT field, supposed to be answered in the future by current technologies like whole-genome sequencing and single-cell approaches.
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Affiliation(s)
- Julia Carolin Golz
- Department of Biological Safety, National Reference Laboratory for Campylobacter, German Federal Institute for Risk Assessment (BfR), Diedersdorfer Weg 1, 12277, Berlin, Germany
| | - Kerstin Stingl
- Department of Biological Safety, National Reference Laboratory for Campylobacter, German Federal Institute for Risk Assessment (BfR), Diedersdorfer Weg 1, 12277, Berlin, Germany.
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9
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Gupta N, Kumar A. Designing an efficient multi-epitope vaccine against Campylobacter jejuni using immunoinformatics and reverse vaccinology approach. Microb Pathog 2020; 147:104398. [PMID: 32771659 DOI: 10.1016/j.micpath.2020.104398] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Revised: 07/11/2020] [Accepted: 07/13/2020] [Indexed: 01/28/2023]
Abstract
Campylobacterjejuni causes acute diarrhea as a leading cause of morbidity and mortality in children especially in the developing countries of Asia and Africa. C.jejuni has been identified as a member of the priority pathogens category due to the sudden emergence of multidrug-resistant isolates. Therefore, it is important to develop a protective vaccine against this pathogen. In the present study, the Reverse vaccinology approach was used to identify vaccine targets from the proteome of diarrheagenic C. jejuni strain NCTC11168 for the development of chimeric vaccine candidates against C. jejuni. Pathogen proteins that have adhesin like properties and role in virulence but not present in the human host were selected for the design of a multi-epitope vaccine. MHC class I & II and B-cell epitopes present in the selected vaccine target proteins were screened using different immunoinformatics tools. The commonly predicted epitopes from their corresponding different servers were selected and further shortlisted based on their immunogenicity, antigenicity, and toxicity analysis. Shortlisted peptides were joined by GPGPG linkers to design a multi-epitope vaccine construct. Immune-modulating adjuvant monophosphoryl lipid sequence was added with the vaccine construct's N terminal using EAAAK linkers to enhance the immunogenicity. The designed vaccine construct was evaluated by antigenicity, allergenicity, solubility, and physicochemical analysis using various bioinformatics tools. A three-dimensional model of vaccine construct was modeled by the Phyre2 server and refinement by the GalaxyRefine tool. Constructed model quality was validated by the ProSA-web error-detection tool and the Ramachandran plot. After that vaccine model was docked with TLR-4 protein and complex stability confirmed by molecular dynamics simulation studies. Finally, In-silico cloning of vaccine constructs into a vector was performed to ensuring its effective expression in the microbial system.
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Affiliation(s)
- Nayan Gupta
- Department of Biotechnology, Faculty of Engineering & Technology, Rama University Uttar Pradesh, Kanpur, 209217, India
| | - Ajay Kumar
- Department of Biotechnology, Faculty of Engineering & Technology, Rama University Uttar Pradesh, Kanpur, 209217, India.
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10
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Tenhagen BA, Alt K, Käsbohrer A, Kollas C, Pfefferkorn B, Naumann S, Wiehle L, Thieck M, Stingl K. Comparison of Antimicrobial Resistance of Thermophilic Campylobacter Isolates from Conventional and Organic Turkey Meat in Germany. Foodborne Pathog Dis 2020; 17:750-757. [PMID: 32678987 DOI: 10.1089/fpd.2020.2815] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The objective of this study was to compare the prevalence and antimicrobial resistance (AMR) rates of Campylobacter spp. isolated from conventional and organic turkey meat sold at retail in Germany. Samples of conventional (N = 527) and organic (N = 245) fresh turkey meat without skin were collected at retail markets throughout Germany and tested for Campylobacter spp.. Campylobacter isolates were tested for resistance to six antimicrobials (gentamicin, streptomycin, ciprofloxacin, nalidixic acid, erythromycin, and tetracycline) using broth microdilution. Prevalence of Campylobacter spp. was higher in organic (32.7%) than in conventional (19.4%) turkey meat. The proportion of fully susceptible isolates was lower in Campylobacter coli (6.8%) than in Campylobacter jejuni (33.9%) and higher in isolates from organic (38.4%) than from conventional production (17.4%). Overall, resistance rates were the highest to ciprofloxacin, nalidixic acid, and tetracycline. Resistance to erythromycin was only observed in C. coli and resistance to gentamicin was absent. Overall, resistance rates to tetracycline and fluoroquinolones were higher in isolates from conventional (60.9% and 78.9%) than from organic meat (32.9% and 58.9%, respectively). However, this significant difference was only observed for C. jejuni, but not for C. coli. Further studies are needed to identify the reasons for the differences in the association of production type of turkeys with AMR in the different Campylobacter spp. and the critical parameters for the reduction of AMR in Campylobacter from turkey meat.
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Affiliation(s)
- Bernd-Alois Tenhagen
- Bundesinstitut für Risikobewertung, Abteilung Biologische Sicherheit, Berlin, Germany
| | - Katja Alt
- Bundesinstitut für Risikobewertung, Abteilung Biologische Sicherheit, Berlin, Germany
| | - Annemarie Käsbohrer
- Bundesinstitut für Risikobewertung, Abteilung Biologische Sicherheit, Berlin, Germany.,Veterinärmedizinische Universität Wien, Institut für Veterinary Public Health, Wien, Germany
| | - Chris Kollas
- Bundesinstitut für Risikobewertung, Abteilung Biologische Sicherheit, Berlin, Germany
| | | | - Steffen Naumann
- Bundesamt für Verbraucherschutz und Lebensmittelsicherheit, Berlin, Germany
| | - Lars Wiehle
- Bundesamt für Verbraucherschutz und Lebensmittelsicherheit, Berlin, Germany
| | - Maja Thieck
- Bundesinstitut für Risikobewertung, Abteilung Biologische Sicherheit, Berlin, Germany
| | - Kerstin Stingl
- Bundesinstitut für Risikobewertung, Abteilung Biologische Sicherheit, Berlin, Germany
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11
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Haldenby S, Bronowski C, Nelson C, Kenny J, Martinez-Rodriguez C, Chaudhuri R, Williams NJ, Forbes K, Strachan NJ, Pulman J, Winstanley IN, Corless CE, Humphrey TJ, Bolton FJ, O’Brien SJ, Hall N, Hertz-Fowler C, Winstanley C. Increasing prevalence of a fluoroquinolone resistance mutation amongst Campylobacter jejuni isolates from four human infectious intestinal disease studies in the United Kingdom. PLoS One 2020; 15:e0227535. [PMID: 31999701 PMCID: PMC6992184 DOI: 10.1371/journal.pone.0227535] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Accepted: 12/20/2019] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Campylobacter jejuni is the most common bacterial cause of human infectious intestinal disease. METHODS We genome sequenced 601 human C. jejuni isolates, obtained from two large prospective studies of infectious intestinal disease (IID1 [isolates from 1993-1996; n = 293] and IID2 [isolates from 2008-2009; n = 93]), the INTEGRATE project [isolates from 2016-2017; n = 52] and the ENIGMA project [isolates from 2017; n = 163]. RESULTS There was a significant increase in the prevalence of the T86I mutation conferring resistance to fluoroquinolone between each of the three later studies (IID2, INTEGRATE and ENIGMA) and IID1. Although the distribution of major multilocus sequence types (STs) was similar between the studies, there were changes in both the abundance of minority STs associated with the T86I mutation, and the abundance of clones within single STs associated with the T86I mutation. DISCUSSION Four population-based studies of community diarrhoea over a 25 year period revealed an increase over time in the prevalence of the T86I amongst isolates of C. jejuni associated with human gastrointestinal disease in the UK. Although associated with many STs, much of the increase is due to the expansion of clones associated with the resistance mutation.
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Affiliation(s)
- Sam Haldenby
- Centre for Genomic Research, University of Liverpool, Liverpool, United Kingdom
| | - Christina Bronowski
- Institute of Infection and Global Health, University of Liverpool, Liverpool, United Kingdom
| | - Charlotte Nelson
- Centre for Genomic Research, University of Liverpool, Liverpool, United Kingdom
| | - John Kenny
- Centre for Genomic Research, University of Liverpool, Liverpool, United Kingdom
| | | | - Roy Chaudhuri
- Department of Biology and Biotechnology, University of Sheffield, Sheffield, United Kingdom
| | - Nicola J. Williams
- Institute of Infection and Global Health, University of Liverpool, Liverpool, United Kingdom
| | - Ken Forbes
- School of Medicine, Medical Sciences & Nutrition, Foresterhill, University of Aberdeen, Aberdeen, United Kingdom
| | - Norval J. Strachan
- School of Biological Sciences, University of Aberdeen, Aberdeen, United Kingdom
| | - Jane Pulman
- Centre for Genomic Research, University of Liverpool, Liverpool, United Kingdom
| | - Ian N. Winstanley
- Centre for Genomic Research, University of Liverpool, Liverpool, United Kingdom
| | - Caroline E. Corless
- Infection and Immunity, Liverpool Clinical Laboratories, Royal Liverpool and Broadgreen University Hospitals NHS Trust, Liverpool, United Kingdom
| | - Tom J. Humphrey
- Medical Microbiology and Infectious Diseases, School of Medicine, Swansea University, Swansea, United Kingdom
| | - Frederick J. Bolton
- Department of Public Health and Policy, Institute of Population Health Sciences, University of Liverpool, Liverpool, United Kingdom
- NIHR Health Protection Research Unit in Gastrointestinal Infections, University of Liverpool, Liverpool, United Kingdom
| | - Sarah J. O’Brien
- Department of Public Health and Policy, Institute of Population Health Sciences, University of Liverpool, Liverpool, United Kingdom
- NIHR Health Protection Research Unit in Gastrointestinal Infections, University of Liverpool, Liverpool, United Kingdom
| | - Neil Hall
- The Earlham Institute, Norwich Research Park, Norwich, United Kingdom
- School of Biological Sciences, University of East Anglia, Norwich, United Kingdom
| | | | - Craig Winstanley
- Institute of Infection and Global Health, University of Liverpool, Liverpool, United Kingdom
- * E-mail:
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12
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Elhadidy M, Ali MM, El-Shibiny A, Miller WG, Elkhatib WF, Botteldoorn N, Dierick K. Antimicrobial resistance patterns and molecular resistance markers of Campylobacter jejuni isolates from human diarrheal cases. PLoS One 2020; 15:e0227833. [PMID: 31951631 PMCID: PMC6968864 DOI: 10.1371/journal.pone.0227833] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Accepted: 12/30/2019] [Indexed: 12/20/2022] Open
Abstract
The aim of this study is to characterize the antimicrobial resistance of Campylobacter jejuni recovered from diarrheal patients in Belgium, focusing on the genetic diversity of resistant strains and underlying molecular mechanisms of resistance among Campylobacter jejuni resistant strains isolated from diarrheal patients in Belgium. Susceptibility profile of 199 clinical C. jejuni isolates was determined by minimum inhibitory concentrations against six commonly-used antibiotics (ciprofloxacin, nalidixic acid, tetracycline, streptomycin, gentamicin, and erythromycin). High rates of resistance were observed against nalidixic acid (56.3%), ciprofloxacin (55.8%) and tetracycline (49.7%); these rates were similar to those obtained from different national reports in broilers intended for human consumption. Alternatively, lower resistance rates to streptomycin (4.5%) and erythromycin (2%), and absolute sensitivity to gentamicin were observed. C. jejuni isolates resistant to tetracycline or quinolones (ciprofloxacin and/or nalidixic acid) were screened for the presence of the tetO gene and the C257T mutation in the quinolone resistance determining region (QRDR) of the gyrase gene gyrA, respectively. Interestingly, some of the isolates that displayed phenotypic resistance to these antimicrobials lacked the corresponding genetic determinants. Among erythromycin-resistant isolates, a diverse array of potential molecular resistance mechanisms was investigated, including the presence of ermB and mutations in the 23S rRNA gene, the rplD and rplV ribosomal genes, and the regulatory region of the cmeABC operon. Two of the four erythromycin-resistant isolates harboured the A2075G transition mutation in the 23S rRNA gene; one of these isolates exhibited further mutations in rplD, rplV and in the cmeABC regulatory region. This study expands the current understanding of how different genetic determinants and particular clones shape the epidemiology of antimicrobial resistance in C. jejuni in Belgium. It also reveals many questions in need of further investigation, such as the role of other undetermined molecular mechanisms that may potentially contribute to the antimicrobial resistance of Campylobacter.
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Affiliation(s)
- Mohamed Elhadidy
- University of Science and Technology, Zewail City of Science and Technology, Giza, Egypt
- Department of Bacteriology, Mycology and Immunology, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt
| | - Mohamed Medhat Ali
- University of Science and Technology, Zewail City of Science and Technology, Giza, Egypt
- Department of Medical Microbiology and Immunology, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| | - Ayman El-Shibiny
- University of Science and Technology, Zewail City of Science and Technology, Giza, Egypt
- Faculty of Environmental Agricultural Sciences, Arish University, Arish, Egypt
| | - William G. Miller
- Prodce Safety and Microbiology Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Albany, CA, United States of America
| | - Walid F. Elkhatib
- Department of Microbiology and Immunology, School of Pharmacy & Pharmaceutical Industries, Badr University in Cairo (BUC), Entertainment Area, Badr City, Cairo, Egypt
- Department of Microbiology & Immunology, Faculty of Pharmacy, Ain Shams University, African Union Organization St. Abbassia, Cairo, Egypt
| | | | - Katelijne Dierick
- National Reference Laboratory for Campylobacter, Sciensano, Scientific Service: Foodborne Pathogens, Brussels, Belgium
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Fiedoruk K, Daniluk T, Rozkiewicz D, Oldak E, Prasad S, Swiecicka I. Whole-genome comparative analysis of Campylobacter jejuni strains isolated from patients with diarrhea in northeastern Poland. Gut Pathog 2019; 11:32. [PMID: 31244901 PMCID: PMC6582539 DOI: 10.1186/s13099-019-0313-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Accepted: 06/01/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Campylobacter jejuni is the leading cause of bacterial gastroenteritis (campylobacteriosis) in humans worldwide, and the most frequent pathogen associated with Guillain-Barré syndrome (GBS) and Miller-Fisher syndrome (MFS). The study was designed in order to assess similarities between genomes of Campylobacter jejuni strains, isolated from children suffering from acute diarrhea in northeastern Poland, in comparison to C. jejuni genomes stored in public databases. The analysis involved phylogeny, resistome and virulome. In addition, the Campylobacter PubMLST database was used to estimate the prevalence of the analyzed C. jejuni sequence type (STs) in other countries. RESULTS Campylobacter jejuni ST50, ST257 and ST51 represented 5.3%, 4.5% and 2.2% of the PubMLST records, respectively. Overall, strains representing the STs showed common resistance to tetracyclines (51.3%) and fluoroquinolones (31.8%), mediated through the tetO gene (98.2%) and point mutation (T86I) in the gyrA gene (100%). However, the latter was present in all our isolates. The major differences in virulence patterns concerned serotypes, lipooligosaccharide (LOS) classes and certain clinically relevant genes. CONCLUSIONS Campylobacter jejuni ST50, ST51 and ST257 are among the top ten of STs isolated in Europe. WGS revealed diversity of serotypes and LOS classes in ST50 strains, that deserves further clinical and epidemiological investigations as it might be related to a risk of post-infectious neurological sequels such as Guillain-Barré syndrome. Additionally, the results implicate lower pathogenic potential and distinct transmission chains or reservoirs for C. jejuni ST51 isolates responsible for campylobacteriosis in northeastern Poland.
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Affiliation(s)
- Krzysztof Fiedoruk
- Department of Microbiology, Medical University of Bialystok, Bialystok, Poland
| | - Tamara Daniluk
- Department of Microbiology, Medical University of Bialystok, Bialystok, Poland
| | - Dorota Rozkiewicz
- Department of Pediatric Infectious Diseases, Medical University of Bialystok, University Children’s Hospital, Bialystok, Poland
| | - Elzbieta Oldak
- Department of Pediatric Infectious Diseases, Medical University of Bialystok, University Children’s Hospital, Bialystok, Poland
| | - Suhanya Prasad
- Department of Microbiological and Nanobiomedical Engineering, Medical University of Bialystok, Bialystok, Poland
| | - Izabela Swiecicka
- Department of Microbiology, University of Bialystok, Bialystok, Poland
- Laboratory of Applied Microbiology, University of Bialystok, Bialystok, Poland
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Agnetti J, Seth-Smith HMB, Ursich S, Reist J, Basler M, Nickel C, Bassetti S, Ritz N, Tschudin-Sutter S, Egli A. Clinical impact of the type VI secretion system on virulence of Campylobacter species during infection. BMC Infect Dis 2019; 19:237. [PMID: 30845966 PMCID: PMC6407262 DOI: 10.1186/s12879-019-3858-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Accepted: 02/28/2019] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND The clinical course of Campylobacter infection varies in symptoms and severity depending on host factors, virulence of the pathogen and initiated therapy. The type VI secretion system (T6SS) has been identified as a novel virulence factor, which mediates contact-dependent injection of enzymes and toxins into competing bacteria or host cells and facilitates the colonisation of a host organism. We aimed to compare the clinical course of Campylobacter infection caused by strains with and without the T6SS and identify possible associations between this putative virulence factor and the clinical manifestations of disease. METHODS From April 2015 to January 2017, patients with detection of Campylobacter spp. were identified at the University Hospital of Basel and the University Children's Hospital of Basel and included in this case-control study. Presence of the T6SS gene cluster was assayed by PCR targeting the hcp gene, confirmed with whole genome sequencing. Pertinent clinical data was collected by medical record review. Differences in disease- and host-characteristics between T6SS-positive (case) and -negative (control) were compared in a uni- and multi-variable analysis. Hospital admission, antibiotic therapy, admission to intensive care unit, development of bacteraemia and in-hospital mortality were considered as clinical endpoints. RESULTS We identified 138 cases of Campylobacter jejuni infections and 18 cases of Campylobacter coli infections from a paediatric and adult population. Analyses were focused on adult patients with C. jejuni (n = 119) of which 16.8% were T6SS-positive. Comparisons between T6SS-positive and -negative C. jejuni isolates did not reveal significant differences regarding clinical manifestations or course of disease. All clinical endpoints showed a similar distribution in both groups. A higher score in the Charlson Comorbidity Index was associated with T6SS-positive C. jejuni isolates (p < 0.001) and patients were more likely to have a solid organ transplant and to be under immunosuppressive therapy. CONCLUSIONS Our study does not provide evidence that T6SS is associated with a more severe clinical course. Interestingly, T6SS-positive isolates are more commonly found in immunocompromised patients: an observation which merits further investigation.
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Affiliation(s)
- Jessica Agnetti
- Applied Microbiology Research, Department of Biomedicine, University of Basel, Basel, Switzerland
| | - Helena M. B. Seth-Smith
- Applied Microbiology Research, Department of Biomedicine, University of Basel, Basel, Switzerland
- Clinical Microbiology, University Hospital Basel, Petersgraben 4, 4031 Basel, Switzerland
| | - Sebastian Ursich
- Biozentrum, University of Basel, Basel, Switzerland
- Current address: Institute for Molecular Cancer Research IMCR, University of Zürich, Zürich, Switzerland
| | - Josiane Reist
- Applied Microbiology Research, Department of Biomedicine, University of Basel, Basel, Switzerland
- Clinical Microbiology, University Hospital Basel, Petersgraben 4, 4031 Basel, Switzerland
| | - Marek Basler
- Biozentrum, University of Basel, Basel, Switzerland
| | - Christian Nickel
- Emergency Department, University Hospital Basel, Basel, Switzerland
| | - Stefano Bassetti
- Department of Internal Medicine, University Hospital Basel, Basel, Switzerland
| | - Nicole Ritz
- Paediatric Infectious Diseases and Vaccinology, University Children Hospital Basel, Basel, Switzerland
- Department of Pediatrics, Royal Children’s Hospital Melbourne, University of Melbourne, Parkville, Australia
| | - Sarah Tschudin-Sutter
- Infectious Diseases and Hospital Epidemiology, University Hospital Basel, Basel, Switzerland
| | - Adrian Egli
- Applied Microbiology Research, Department of Biomedicine, University of Basel, Basel, Switzerland
- Current address: Institute for Molecular Cancer Research IMCR, University of Zürich, Zürich, Switzerland
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15
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Kovanen S, Rossi M, Pohja-Mykrä M, Nieminen T, Raunio-Saarnisto M, Sauvala M, Fredriksson-Ahomaa M, Hänninen ML, Kivistö R. Population Genetics and Characterization of Campylobacter jejuni Isolates from Western Jackdaws and Game Birds in Finland. Appl Environ Microbiol 2019; 85:e02365-18. [PMID: 30552190 PMCID: PMC6365822 DOI: 10.1128/aem.02365-18] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Accepted: 12/08/2018] [Indexed: 01/18/2023] Open
Abstract
Poultry are considered a major reservoir and source of human campylobacteriosis, but the roles of environmental reservoirs, including wild birds, have not been assessed in depth. In this study, we isolated and characterized Campylobacter jejuni from western jackdaws (n = 91, 43%), mallard ducks (n = 82, 76%), and pheasants (n = 9, 9%). Most of the western jackdaw and mallard duck C. jejuni isolates represented multilocus sequence typing (MLST) sequence types (STs) that diverged from those previously isolated from human patients and various animal species, whereas all pheasant isolates represented ST-19, a common ST among human patients and other hosts worldwide. Whole-genome MLST revealed that mallard duck ST-2314 and pheasant ST-19 isolates represented bacterial clones that were genetically highly similar to human isolates detected previously. Further analyses revealed that in addition to a divergent ClonalFrame genealogy, certain genomic characteristics of the western jackdaw C. jejuni isolates, e.g., a novel cdtABC gene cluster and the type VI secretion system (T6SS), may affect their host specificity and virulence. Game birds may thus pose a risk for acquiring campylobacteriosis; therefore, hygienic measures during slaughter and meat handling warrant special attention.IMPORTANCE The roles of environmental reservoirs, including wild birds, in the molecular epidemiology of Campylobacter jejuni have not been assessed in depth. Our results showed that game birds may pose a risk for acquiring campylobacteriosis, because they had C. jejuni genomotypes highly similar to human isolates detected previously. Therefore, hygienic measures during slaughter and meat handling warrant special attention. On the contrary, a unique phylogeny was revealed for the western jackdaw isolates, and certain genomic characteristics identified among these isolates are hypothesized to affect their host specificity and virulence. Comparative genomics within sequence types (STs), using whole-genome multilocus sequence typing (wgMLST), and phylogenomics are efficient methods to analyze the genomic relationships of C. jejuni isolates.
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Affiliation(s)
- Sara Kovanen
- Department of Food Hygiene and Environmental Health, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
| | - Mirko Rossi
- Department of Food Hygiene and Environmental Health, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
| | - Mari Pohja-Mykrä
- Ruralia Institute, Faculty of Agriculture and Forestry, University of Helsinki, Seinäjoki, Finland
| | - Timo Nieminen
- Ruralia Institute, Faculty of Agriculture and Forestry, University of Helsinki, Seinäjoki, Finland
| | | | - Mikaela Sauvala
- Department of Food Hygiene and Environmental Health, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
| | - Maria Fredriksson-Ahomaa
- Department of Food Hygiene and Environmental Health, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
| | - Marja-Liisa Hänninen
- Department of Food Hygiene and Environmental Health, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
| | - Rauni Kivistö
- Department of Food Hygiene and Environmental Health, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
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16
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Yamada K, Saito R, Muto S, Sasaki M, Murakami H, Aoki K, Ishii Y, Tateda K. Long-term observation of antimicrobial susceptibility and molecular characterisation of Campylobacter jejuni isolated in a Japanese general hospital 2000-2017. J Glob Antimicrob Resist 2019; 18:59-63. [PMID: 30753906 DOI: 10.1016/j.jgar.2019.02.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 02/01/2019] [Accepted: 02/01/2019] [Indexed: 11/18/2022] Open
Abstract
OBJECTIVES Campylobacter jejuni (C. jejuni) is one of the most common pathogens that causes gastroenteritis. Because there is currently insufficient epidemiological information about the antimicrobial susceptibility and molecular characterisation of clinical isolates of C. jejuni in Japan, this study carried out antimicrobial susceptibility testing and multilocus sequence typing (MLST) of clinical C. jejuni isolates in Tokyo between 2000-2017. METHODS Antimicrobial susceptibility to erythromycin and ciprofloxacin was tested using the broth microdilution method in 430 C. jejuni clinical isolates collected over 18 years, between 2000-2017, at a Tokyo general hospital. To observe the sequence type (ST) evolution, 82 isolates were chosen from three non-consecutive years (16 isolates from 2000, 25 isolates from 2008, and 41 isolates from 2017) and analysed by MLST as a molecular characterisation test. Mutations in the quinolone resistance-determining region of the gyrA and gyrB genes were identified. RESULTS The rate of resistance to erythromycin was low, but that of ciprofloxacin resistance was 34.9% in 2000-2008 and 41.9% in 2009-2017. The most common clonal complex (CC) identified during the entire period was CC21; ST4526 with ciprofloxacin resistance was highly prevalent in 2017 (6 of 11; 54.5%). CONCLUSION The results indicate that the rate of resistance to quinolone has gradually increased. Since ST4526 was not isolated in 2000 and 2008, it is likely that ST4526 is rapidly increasing in Japan.
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Affiliation(s)
- Kageto Yamada
- Department of Clinical Laboratory, Toho University Medical center Omori Hospital, Tokyo, Japan.
| | - Ryoichi Saito
- Department of Microbiology and Immunology, Graduate School of Health Care Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Saori Muto
- Department of Clinical Laboratory, Tokyo Metropolitan Health and Medical Treatment Corporation Toshima Hospital, Tokyo, Japan
| | - Masakazu Sasaki
- Department of Clinical Laboratory, Toho University Medical center Omori Hospital, Tokyo, Japan
| | - Hinako Murakami
- Department of Clinical Laboratory, Toho University Medical center Omori Hospital, Tokyo, Japan
| | - Kotaro Aoki
- Department of Microbiology and Infectious Disease, Toho University School of Medicine, Tokyo, Japan
| | - Yoshikazu Ishii
- Department of Microbiology and Infectious Disease, Toho University School of Medicine, Tokyo, Japan
| | - Kazuhiro Tateda
- Department of Microbiology and Infectious Disease, Toho University School of Medicine, Tokyo, Japan
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17
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Mäesaar M, Meremäe K, Ivanova M, Roasto M. Antimicrobial resistance and multilocus sequence types of Campylobacter jejuni isolated from Baltic broiler chicken meat and Estonian human patients. Poult Sci 2018; 97:3645-3651. [DOI: 10.3382/ps/pey219] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Accepted: 04/30/2018] [Indexed: 11/20/2022] Open
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18
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Devi A, Mahony TJ, Wilkinson JM, Vanniasinkam T. Antimicrobial susceptibility of clinical isolates of Campylobacter jejuni from New South Wales, Australia. J Glob Antimicrob Resist 2018; 16:76-80. [PMID: 30267925 DOI: 10.1016/j.jgar.2018.09.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Revised: 09/17/2018] [Accepted: 09/19/2018] [Indexed: 01/22/2023] Open
Abstract
OBJECTIVES The aim of this study was to investigate the prevalence of resistance to commonly used antimicrobials in Campylobacter jejuni isolates from clinical faecal samples in New South Wales (NSW), Australia. METHODS A total of 117 C. jejuni isolates from human faecal samples from regional and metropolitan NSW were examined for antimicrobial resistance. RESULTS Of the 117 isolates tested, 15.4% were resistant to ampicillin, 5.1% to tetracycline and 13.7% to ciprofloxacin. Most of the isolates were susceptible to erythromycin, except for three that showed intermediate resistance. Furthermore, 9.4% of isolates were resistant (or intermediate-resistant) to more than one antimicrobial agent. Isolates that were resistant to ampicillin and tetracycline harboured the blaOXA-61 and tet(O) genes, respectively. A mutation in the gyrA gene, resulting in the T86I substitution, was identified in the majority of ciprofloxacin-resistant isolates. CONCLUSION The data obtained in the current study demonstrate that the majority of C. jejuni isolates evaluated were susceptible to one or more antimicrobials tested. Apart from three isolates that demonstrated intermediate resistance, all of the isolates were susceptible to erythromycin, which is the drug of choice for treating Campylobacter infections.
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Affiliation(s)
- Aruna Devi
- School of Biomedical Sciences, Charles Sturt University, Wagga Wagga, New South Wales, Australia
| | - Timothy J Mahony
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, Queensland, Australia
| | - Jenny M Wilkinson
- School of Biomedical Sciences, Charles Sturt University, Wagga Wagga, New South Wales, Australia
| | - Thiru Vanniasinkam
- School of Biomedical Sciences, Charles Sturt University, Wagga Wagga, New South Wales, Australia.
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Antibiotic resistance, molecular characterizations, and clinical manifestations of Campylobacteriosis at a military medical center in Hawaii from 2012-2016: a retrospective analysis. Sci Rep 2018; 8:11736. [PMID: 30082843 PMCID: PMC6078982 DOI: 10.1038/s41598-018-29461-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Accepted: 06/28/2018] [Indexed: 01/20/2023] Open
Abstract
Hawaii has one of the highest incidences of Campylobacteriosis in the United States, but there remains little published data on circulating strains or antimicrobial resistance. We characterized 110 clinical Campylobacter isolates (106 C. jejuni, 4 C. coli) processed at Tripler Army Medical Center in Honolulu, HI from 2012–2016. Twenty-five percent of C. jejuni isolates exhibited fluoroquinolone (FQ) resistance, compared with 16% for tetracycline (TET), and 0% for macrolides. Two of the four C. coli isolates were resistant to FQ, TET, and macrolides. C. jejuni isolates further underwent multilocus sequence typing, pulsed-field gel electrophoresis, and molecular capsular typing. Nineteen capsule types were observed, with two capsule types (HS2 and HS9) being associated with FQ resistance (p < 0.001 and p = 0.006, respectively). HS2 FQ-resistant isolates associated with clonal complex 21, possibly indicating clonal spread in FQ resistance. Macrolides should be considered for treatment of suspect cases due to lack of observed resistance.
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20
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Elhadidy M, Miller WG, Arguello H, Álvarez-Ordóñez A, Duarte A, Dierick K, Botteldoorn N. Genetic Basis and Clonal Population Structure of Antibiotic Resistance in Campylobacter jejuni Isolated From Broiler Carcasses in Belgium. Front Microbiol 2018; 9:1014. [PMID: 29867900 PMCID: PMC5966580 DOI: 10.3389/fmicb.2018.01014] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2018] [Accepted: 04/30/2018] [Indexed: 12/21/2022] Open
Abstract
Human campylobacteriosis is the leading food-borne zoonosis in industrialized countries. This study characterized the clonal population structure, antimicrobial resistance profiles and occurrence of antimicrobial resistance determinants of a set of Campylobacter jejuni strains isolated from broiler carcasses in Belgium. Minimum inhibitory concentrations (MICs) against five commonly-used antibiotics (ciprofloxacin, nalidixic acid, tetracycline, gentamicin, and erythromycin) were determined for 204 C. jejuni isolates. More than half of the isolates were resistant to ciprofloxacin or nalidixic acid. In contrast, a lower percentage of screened isolates were resistant to gentamicin or erythromycin. C. jejuni isolates resistant to ciprofloxacin and/or nalidixic acid were screened for the substitution T86I in the quinolone resistance determining region (QRDR) of the gyrA gene, while C. jejuni isolates resistant to tetracycline were screened for the presence of the tet(O) gene. These resistance determinants were observed in most but not all resistant isolates. Regarding resistance to erythromycin, different mutations occurred in diverse genetic loci, including mutations in the 23S rRNA gene, the rplD and rplV ribosomal genes, and the intergenic region between cmeR and cmeABC. Interestingly, and contrary to previous reports, the A2075G transition mutation in the 23S rRNA gene was only found in one strain displaying a high level of resistance to erythromycin. Ultimately, molecular typing by multilocus sequence typing revealed that two sequence types (ST-824 and ST-2274) were associated to quinolones resistance by the presence of mutations in the gene gyrA (p = 0.01). In addition, ST-2274 was linked to the CIP-NAL-TET-AMR multidrug resistant phenotype. In contrast, clonal complex CC-45 was linked to increased susceptibility to the tested antibiotics. The results obtained in this study provide better understanding of the phenotypic and the molecular basis of antibiotic resistance in C. jejuni, unraveling some the mechanisms which confer antimicrobial resistance and particular clones associated to the carriage and spread of resistance genes.
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Affiliation(s)
- Mohamed Elhadidy
- Department of Bacteriology, Mycology and Immunology, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt
- University of Science and Technology, Zewail City of Science and Technology, Giza, Egypt
| | - William G. Miller
- Produce Safety and Microbiology Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Albany, CA, United States
| | - Hector Arguello
- Genomics and Animal Breeding, Department of Genetics, Faculty of Veterinary Science, University of Córdoba, Córdoba, Spain
| | - Avelino Álvarez-Ordóñez
- Department of Food Hygiene and Technology, Institute of Food Science and Technology, University of León, León, Spain
| | - Alexandra Duarte
- Laboratory of Food Microbiology and Food Preservation, Department of Food Safety and Food Quality, Faculty of Bioscience Engineering, Ghent University, Gent, Belgium
- National Reference Laboratory for Campylobacter, Scientific Institute of Public Health (WIV-ISP), Scientific Service: Foodborne Pathogens, Brussels, Belgium
| | - Katelijne Dierick
- National Reference Laboratory for Campylobacter, Scientific Institute of Public Health (WIV-ISP), Scientific Service: Foodborne Pathogens, Brussels, Belgium
| | - Nadine Botteldoorn
- National Reference Laboratory for Campylobacter, Scientific Institute of Public Health (WIV-ISP), Scientific Service: Foodborne Pathogens, Brussels, Belgium
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21
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Sproston EL, Wimalarathna HML, Sheppard SK. Trends in fluoroquinolone resistance in Campylobacter. Microb Genom 2018; 4:e000198. [PMID: 30024366 PMCID: PMC6159550 DOI: 10.1099/mgen.0.000198] [Citation(s) in RCA: 71] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Accepted: 06/26/2018] [Indexed: 12/29/2022] Open
Abstract
Members of the genus Campylobacter remain a leading cause of bacterial gastroenteritis worldwide. Infection is usually self-limiting but in severe cases may require antibiotic treatment. In a recent statement by the World Health Organization (WHO) Campylobacter was named as one of the 12 bacteria that pose the greatest threat to human health because they are resistant to antibiotics. In this mini review we describe recent trends in fluoroquinolone (FQ) (particularly ciprofloxacin) resistance in strains of members of the genus Campylobacter isolated from livestock and clinical samples from several countries. Using evidence from phenotyping surveys and putative resistance prediction from DNA sequence data, we discuss the acquisition and spread of FQ resistance and the role of horizontal gene transfer and describe trends in FQ-resistance in samples from livestock and clinical cases. This review emphasises that FQ resistance remains common among isolates of members of the genus Campylobacter from various sources.
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Affiliation(s)
- Emma L. Sproston
- The Milner Centre for Evolution, Department of Biology and Biochemistry, University of Bath, Bath BA27AY, UK
| | | | - Samuel K. Sheppard
- The Milner Centre for Evolution, Department of Biology and Biochemistry, University of Bath, Bath BA27AY, UK
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22
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Kovac J, Stessl B, Čadež N, Gruntar I, Cimerman M, Stingl K, Lušicky M, Ocepek M, Wagner M, Smole Možina S. Population structure and attribution of human clinical Campylobacter jejuni isolates from central Europe to livestock and environmental sources. Zoonoses Public Health 2017; 65:51-58. [PMID: 28755449 DOI: 10.1111/zph.12366] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Indexed: 12/19/2022]
Abstract
Campylobacter jejuni is among the most prevalent causes of human bacterial gastroenteritis worldwide. Domesticated animals and, especially, chicken meat are considered to be the main sources of infections. However, the contribution of surface waters and wildlife in C. jejuni transmission to humans is not well understood. We have evaluated the source attribution potential of a six-gene multiplex PCR (mPCR) method coupled with STRUCTURE analysis on a set of 410 C. jejuni strains isolated from environment, livestock, food and humans in central Europe. Multiplex PCR fingerprints were analysed using Subclade prediction algorithm to classify them into six distinct mPCR clades. A subset of C. jejuni isolates (70%) was characterized by multilocus sequence typing (MLST) demonstrating 74% congruence between mPCR and MLST. The correspondence analysis of mPCR clades and sources of isolation indicated three distinct groups in the studied C. jejuni population-the first one associated with isolates from poultry, the second one with isolates from cattle, and the third one with isolates from the environment. The STRUCTURE analysis attributed 7.2% and 21.7% of human isolates to environmental sources based on MLST and mPCR fingerprints, respectively.
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Affiliation(s)
- J Kovac
- Department of Food Science and Technology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia.,Department of Food Science, The Pennsylvania State University, State College, PA, USA
| | - B Stessl
- Institute of Milk Hygiene, Milk Technology and Food Science, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine, Vienna, Austria
| | - N Čadež
- Department of Food Science and Technology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - I Gruntar
- Institute of Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - M Cimerman
- National Laboratory of Health, Environment and Food, Department of Microbiological Analysis of Food, Water and Environmental Samples Maribor, Maribor, Slovenia
| | - K Stingl
- Department of Biological Safety, National Reference Laboratory for Campylobacter, Federal Institute for Risk Assessment (BfR), Berlin, Germany
| | - M Lušicky
- National Laboratory of Health, Environment and Food, Department of Microbiological Analysis of Food, Water and Environmental Samples Maribor, Maribor, Slovenia
| | - M Ocepek
- Institute of Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - M Wagner
- Institute of Milk Hygiene, Milk Technology and Food Science, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine, Vienna, Austria
| | - S Smole Možina
- Department of Food Science and Technology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
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23
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Ladely SR, Berrang ME, Meinersmann RJ, Cox NA. Campylobactermulti-locus sequence types and antimicrobial susceptibility of broiler cecal isolates: A two year study of 143 commercial flocks. J Food Saf 2017. [DOI: 10.1111/jfs.12366] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- Scott R. Ladely
- U.S. Department of Agriculture; Food Safety Inspection Service, US National Poultry Research Center; Athens Georgia 30605
| | - Mark. E. Berrang
- U.S. Department of Agriculture; Agricultural Research Service, US National Poultry Research Center; Athens Georgia 30605
| | - Richard J. Meinersmann
- U.S. Department of Agriculture; Agricultural Research Service, US National Poultry Research Center; Athens Georgia 30605
| | - Nelson A. Cox
- U.S. Department of Agriculture; Agricultural Research Service, US National Poultry Research Center; Athens Georgia 30605
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24
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Tang Y, Sahin O, Pavlovic N, LeJeune J, Carlson J, Wu Z, Dai L, Zhang Q. Rising fluoroquinolone resistance in Campylobacter isolated from feedlot cattle in the United States. Sci Rep 2017; 7:494. [PMID: 28356558 PMCID: PMC5428712 DOI: 10.1038/s41598-017-00584-z] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Accepted: 03/03/2017] [Indexed: 11/09/2022] Open
Abstract
Antibiotic resistance, particularly to fluoroquinolones and macrolides, in the major foodborne pathogen Campylobacter is considered a serious threat to public health. Although ruminant animals serve as a significant reservoir for Campylobacter, limited information is available on antibiotic-resistant Campylobacter of bovine origin. Here, we analyzed the antimicrobial susceptibilities of 320 C. jejuni and 115 C. coli isolates obtained from feedlot cattle farms in multiple states in the U.S. The results indicate that fluoroquinolone resistance reached to 35.4% in C. jejuni and 74.4% in C. coli, which are significantly higher than those previously reported in the U.S. While all fluoroquinolone resistant (FQR) C. coli isolates examined in this study harbored the single Thr-86-Ile mutation in GyrA, FQRC. jejuni isolates had other mutations in GyrA in addition to the Thr-86-Ile change. Notably, most of the analyzed FQRC. coli isolates had similar PFGE (pulsed field gel electrophoresis) patterns and the same MLST (multilocus sequence typing) sequence type (ST-1068) regardless of their geographic sources and time of isolation, while the analyzed C. jejuni isolates were genetically diverse, suggesting that clonal expansion is involved in dissemination of FQRC. coli but not C. jejuni. These findings reveal the rising prevalence of FQRCampylobacter in the U.S. and provide novel information on the epidemiology of antibiotic-resistant Campylobacter in the ruminant reservoir.
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Affiliation(s)
- Yizhi Tang
- Department of Veterinary Microbiology and Preventive Medicine, Ames, IA, USA
| | - Orhan Sahin
- Department of Veterinary Microbiology and Preventive Medicine, Ames, IA, USA. .,Department of Veterinary Diagnostic and Production Animal Medicine, Ames, IA, USA.
| | - Nada Pavlovic
- Department of Veterinary Microbiology and Preventive Medicine, Ames, IA, USA
| | - Jeff LeJeune
- Food Animal Health Research Program, Ohio State University, Wooster, OH, USA
| | - James Carlson
- National Wildlife Research Center, USDA APHIS, Fort Collins, CO, USA
| | - Zuowei Wu
- Department of Veterinary Microbiology and Preventive Medicine, Ames, IA, USA
| | - Lei Dai
- Department of Veterinary Microbiology and Preventive Medicine, Ames, IA, USA
| | - Qijing Zhang
- Department of Veterinary Microbiology and Preventive Medicine, Ames, IA, USA.
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25
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Johnson TJ, Shank JM, Johnson JG. Current and Potential Treatments for Reducing Campylobacter Colonization in Animal Hosts and Disease in Humans. Front Microbiol 2017; 8:487. [PMID: 28386253 PMCID: PMC5362611 DOI: 10.3389/fmicb.2017.00487] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Accepted: 03/08/2017] [Indexed: 12/18/2022] Open
Abstract
Campylobacter jejuni is the leading cause of bacteria-derived gastroenteritis worldwide. In the developed world, Campylobacter is usually acquired by consuming under-cooked poultry, while in the developing world it is often obtained through drinking contaminated water. Once consumed, the bacteria adhere to the intestinal epithelium or mucus layer, causing toxin-mediated inhibition of fluid reabsorption from the intestine and invasion-induced inflammation and diarrhea. Traditionally, severe or prolonged cases of campylobacteriosis have been treated with antibiotics; however, overuse of these antibiotics has led to the emergence of antibiotic-resistant strains. As the incidence of antibiotic resistance, emergence of post-infectious diseases, and economic burden associated with Campylobacter increases, it is becoming urgent that novel treatments are developed to reduce Campylobacter numbers in commercial poultry and campylobacteriosis in humans. The purpose of this review is to provide the current status of present and proposed treatments to combat Campylobacter infection in humans and colonization in animal reservoirs. These treatments include anti-Campylobacter compounds, probiotics, bacteriophage, vaccines, and anti-Campylobacter bacteriocins, all of which may be successful at reducing the incidence of campylobacteriosis in humans and/or colonization loads in poultry. In addition to reviewing treatments, we will also address several proposed targets that may be used in future development of novel anti-Campylobacter treatments.
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Affiliation(s)
- Tylor J Johnson
- Department of Microbiology, The University of Tennessee, Knoxville TN, USA
| | - Janette M Shank
- Department of Microbiology, The University of Tennessee, Knoxville TN, USA
| | - Jeremiah G Johnson
- Department of Microbiology, The University of Tennessee, Knoxville TN, USA
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26
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Kumar A, Drozd M, Pina-Mimbela R, Xu X, Helmy YA, Antwi J, Fuchs JR, Nislow C, Templeton J, Blackall PJ, Rajashekara G. Novel Anti-Campylobacter Compounds Identified Using High Throughput Screening of a Pre-selected Enriched Small Molecules Library. Front Microbiol 2016; 7:405. [PMID: 27092106 PMCID: PMC4821856 DOI: 10.3389/fmicb.2016.00405] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2015] [Accepted: 03/14/2016] [Indexed: 12/12/2022] Open
Abstract
Campylobacter is a leading cause of foodborne bacterial gastroenteritis worldwide and infections can be fatal. The emergence of antibiotic-resistant Campylobacter spp. necessitates the development of new antimicrobials. We identified novel anti-Campylobacter small molecule inhibitors using a high throughput growth inhibition assay. To expedite screening, we made use of a "bioactive" library of 4182 compounds that we have previously shown to be active against diverse microbes. Screening for growth inhibition of Campylobacter jejuni, identified 781 compounds that were either bactericidal or bacteriostatic at a concentration of 200 μM. Seventy nine of the bactericidal compounds were prioritized for secondary screening based on their physico-chemical properties. Based on the minimum inhibitory concentration against a diverse range of C. jejuni and a lack of effect on gut microbes, we selected 12 compounds. No resistance was observed to any of these 12 lead compounds when C. jejuni was cultured with lethal or sub-lethal concentrations suggesting that C. jejuni is less likely to develop resistance to these compounds. Top 12 compounds also possessed low cytotoxicity to human intestinal epithelial cells (Caco-2 cells) and no hemolytic activity against sheep red blood cells. Next, these 12 compounds were evaluated for ability to clear C. jejuni in vitro. A total of 10 compounds had an anti-C. jejuni effect in Caco-2 cells with some effective even at 25 μM concentrations. These novel 12 compounds belong to five established antimicrobial chemical classes; piperazines, aryl amines, piperidines, sulfonamide, and pyridazinone. Exploitation of analogs of these chemical classes may provide Campylobacter specific drugs that can be applied in both human and animal medicine.
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Affiliation(s)
- Anand Kumar
- Food Animal Health Research Program, Department of Veterinary Preventive Medicine, The Ohio State UniversityWooster, OH, USA; Poultry CRC, University of New EnglandArmidale, NSW, Australia
| | - Mary Drozd
- Food Animal Health Research Program, Department of Veterinary Preventive Medicine, The Ohio State UniversityWooster, OH, USA; Poultry CRC, University of New EnglandArmidale, NSW, Australia
| | - Ruby Pina-Mimbela
- Food Animal Health Research Program, Department of Veterinary Preventive Medicine, The Ohio State University Wooster, OH, USA
| | - Xiulan Xu
- Department of Plant Pathology, Ohio Agricultural Research and Development Center, The Ohio State University Wooster, OH, USA
| | - Yosra A Helmy
- Food Animal Health Research Program, Department of Veterinary Preventive Medicine, The Ohio State University Wooster, OH, USA
| | - Janet Antwi
- College of Pharmacy, The Ohio State University Columbus, OH, USA
| | - James R Fuchs
- College of Pharmacy, The Ohio State University Columbus, OH, USA
| | - Corey Nislow
- Pharmaceutical Sciences, The University of British Columbia Vancouver, BC, Canada
| | - Jillian Templeton
- Department of Agriculture and Fisheries, EcoSciences Precinct Dutton Park, QLD, Australia
| | - Patrick J Blackall
- Poultry CRC, University of New EnglandArmidale, NSW, Australia; Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, EcoSciences PrecinctDutton Park, QLD, Australia
| | - Gireesh Rajashekara
- Food Animal Health Research Program, Department of Veterinary Preventive Medicine, The Ohio State University Wooster, OH, USA
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27
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Klein-Jöbstl D, Sofka D, Iwersen M, Drillich M, Hilbert F. Multilocus Sequence Typing and Antimicrobial Resistance of Campylobacter jejuni Isolated from Dairy Calves in Austria. Front Microbiol 2016; 7:72. [PMID: 26870027 PMCID: PMC4737881 DOI: 10.3389/fmicb.2016.00072] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2015] [Accepted: 01/15/2016] [Indexed: 11/13/2022] Open
Abstract
Human campylobacteriosis is primarily associated with poultry but also cattle. In this study, 55 Campylobacter jejuni strains isolated from 382 dairy calves’ feces were differentiated by multilocus sequence typing and tested for antimicrobial resistance. The most prevalent sequence type (ST) was ST883 (20.0%), followed by ST48 (14.5%), and ST50 (9.1%). In contrast to ST48 and ST50, ST883 has rarely been described in cattle previously. Furthermore, risk factor analysis was performed for the presence of the most prevalent STs in these calves. Multiple regression analysis revealed that the type of farm (organic vs. conventional) and calf housing (place, and individual vs. group) were identified as significantly (p < 0.05) associated with the presence of ST883 in calves, and ST50 was associated with calf diarrhea. Antimicrobial resistance was detected in 58.2% of the isolates. Most of the resistant isolates (81.3%) were resistant to more than one antimicrobial. Most frequently, resistance to ciprofloxacin (49.1%), followed by nalidixic acid (42.8%), and tetracycline (14.5%) was observed. The results of the present study support the hypothesis that dairy calves may serve as a potential reservoir for C. jejuni and pose a risk for transmission, including antimicrobial resistant isolates to the environment and to humans.
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Affiliation(s)
- Daniela Klein-Jöbstl
- Clinical Unit for Herd Health Management, University Clinic for Ruminants, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine Vienna Vienna, Austria
| | - Dmitri Sofka
- Institute of Meat Hygiene, Meat Technology and Food Science, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine Vienna Vienna, Austria
| | - Michael Iwersen
- Clinical Unit for Herd Health Management, University Clinic for Ruminants, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine Vienna Vienna, Austria
| | - Marc Drillich
- Clinical Unit for Herd Health Management, University Clinic for Ruminants, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine Vienna Vienna, Austria
| | - Friederike Hilbert
- Institute of Meat Hygiene, Meat Technology and Food Science, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine Vienna Vienna, Austria
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