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Bunduruș IA, Balta I, Ștef L, Ahmadi M, Peț I, McCleery D, Corcionivoschi N. Overview of Virulence and Antibiotic Resistance in Campylobacter spp. Livestock Isolates. Antibiotics (Basel) 2023; 12:antibiotics12020402. [PMID: 36830312 PMCID: PMC9952398 DOI: 10.3390/antibiotics12020402] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 02/09/2023] [Accepted: 02/10/2023] [Indexed: 02/19/2023] Open
Abstract
Campylobacter remains the most prevalent foodborne pathogen bacterium responsible for causing gastroenteritis worldwide. Specifically, this pathogen colonises a ubiquitous range of environments, from poultry, companion pets and livestock animals to humans. The bacterium is uniquely adaptable to various niches, leading to complicated gastroenteritis and, in some cases, difficult to treat due to elevated resistance to certain antibiotics. This increased resistance is currently detected via genomic, clinical or epidemiological studies, with the results highlighting worrying multi-drug resistant (MDR) profiles in many food and clinical isolates. The Campylobacter genome encodes a rich inventory of virulence factors offering the bacterium the ability to influence host immune defences, survive antimicrobials, form biofilms and ultimately boost its infection-inducing potential. The virulence traits responsible for inducing clinical signs are not sufficiently defined because several populations have ample virulence genes with physiological functions that reflect their pathogenicity differences as well as a complement of antimicrobial resistance (AMR) systems. Therefore, exhaustive knowledge of the virulence factors associated with Campylobacter is crucial for collecting molecular insights into the infectivity processes, which could pave the way for new therapeutical targets to combat and control the infection and mitigate the spread of MDR bacteria. This review provides an overview of the spread and prevalence of genetic determinants associated with virulence and antibiotic resistance from studies performed on livestock animals. In addition, we have investigated the relevant coincidental associations between the prevalence of the genes responsible for pathogenic virulence, horizontal gene transfer (HGT) and transmissibility of highly pathogenic Campylobacter strains.
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Affiliation(s)
- Iulia Adelina Bunduruș
- Faculty of Bioengineering of Animal Resources, University of Life Sciences King Mihai I from Timisoara, 300645 Timisoara, Romania
| | - Igori Balta
- Faculty of Bioengineering of Animal Resources, University of Life Sciences King Mihai I from Timisoara, 300645 Timisoara, Romania
| | - Lavinia Ștef
- Faculty of Bioengineering of Animal Resources, University of Life Sciences King Mihai I from Timisoara, 300645 Timisoara, Romania
| | - Mirela Ahmadi
- Faculty of Bioengineering of Animal Resources, University of Life Sciences King Mihai I from Timisoara, 300645 Timisoara, Romania
| | - Ioan Peț
- Faculty of Bioengineering of Animal Resources, University of Life Sciences King Mihai I from Timisoara, 300645 Timisoara, Romania
| | - David McCleery
- Faculty of Bioengineering of Animal Resources, University of Life Sciences King Mihai I from Timisoara, 300645 Timisoara, Romania
- Bacteriology Branch, Veterinary Sciences Division, Agri-Food and Biosciences Institute, Belfast BT4 3SD, UK
- Correspondence: (D.M.); (N.C.)
| | - Nicolae Corcionivoschi
- Faculty of Bioengineering of Animal Resources, University of Life Sciences King Mihai I from Timisoara, 300645 Timisoara, Romania
- Bacteriology Branch, Veterinary Sciences Division, Agri-Food and Biosciences Institute, Belfast BT4 3SD, UK
- Correspondence: (D.M.); (N.C.)
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Ramatla T, Mileng K, Ndou R, Tawana M, Mofokeng L, Syakalima M, Lekota KE, Thekisoe O. Campylobacter jejuni from Slaughter Age Broiler Chickens: Genetic Characterization, Virulence, and Antimicrobial Resistance Genes. Int J Microbiol 2022; 2022:1713213. [PMID: 35634271 PMCID: PMC9135541 DOI: 10.1155/2022/1713213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 04/26/2022] [Accepted: 05/05/2022] [Indexed: 11/17/2022] Open
Abstract
Campylobacter jejuni is a major cause of food-borne human gastroenteritis worldwide and is designated as a high priority antimicrobial-resistant pathogen by the World Health Organization (WHO). In this study, a total of 26 C. jejuni isolates from broiler chickens were screened for the presence of virulence and antimicrobial resistance genes by PCR. As a result, the study detected 11/26 (42.3%), 9/26 (34.6%), 8/26 (30.8%), 7/26 (26.9%), 6/26 (23.1%), and 6/26 (23.1%) of cdtC, pldA, cdtB, cdtA, cadF, and ciaB virulence genes, respectively, with seven of the isolates carrying more than two virulence genes. The majority of the isolates n = 25 (96.1%) were resistant to nalidixic acid, followed by n = 21 (80.7%), n = 22 (84.6%), and n = 5 (19.2%) for tetracycline, erythromycin, and ciprofloxacin, respectively. Most isolates were harboring catI (n = 16; 84.2%), catII (n = 15; 78.9%), catIII (n = 10; 52.6%), catIV (n = 2; 10.5%), floR (n = 10; 52.6%), ermB (n = 14; 73.7%), tetO (n = 13; 68.4%), tetA (n = 9; 47.4%), mcr-4 (n = 8; 42.1%), and ampC (n = 2; 10.5%). Meanwhile, mcr-1, mcr-2, mcr-3, mcr-5, tet(X), tet(P), and tet(W) genes were not detected in all isolates. Class I and Class II integrons were detected in 92.3% (n = 24) and 65.4% (n = 17) isolates, respectively. About 31% (8 of the 26 isolates) isolates were carrying more than two resistance genes. According to our knowledge, this is the first study to detect class II integrons in Campylobacter spp. (C. jejuni). The high prevalence of cdtA, cdtB, cdtC, cadF, pldA, and ciaB genes and antibiotic resistance genes in C. jejuni in this study indicates the pathogenic potential of these isolates. Majority of the isolates demonstrated resistance to nalidixic acid, tetracycline (tet), and erythromycin (ermB), which are the drugs of choice for treating Campylobacter infections. Therefore, these findings highlight the importance of implementing an efficient strategy to control Campylobacter in chickens and to reduce antimicrobial use in the poultry industry, which will help to prevent the spread of infections to humans.
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Affiliation(s)
- Tsepo Ramatla
- Department of Animal Health, School of Agriculture, North-West University, Private Bag X2046, Mmabatho 2735, South Africa
- Unit for Environmental Sciences and Management, North-West University, Private Bag X6001, Potchefstroom 2531, South Africa
| | - Kealeboga Mileng
- Department of Animal Health, School of Agriculture, North-West University, Private Bag X2046, Mmabatho 2735, South Africa
| | - Rendani Ndou
- Department of Animal Health, School of Agriculture, North-West University, Private Bag X2046, Mmabatho 2735, South Africa
| | - Mpho Tawana
- Unit for Environmental Sciences and Management, North-West University, Private Bag X6001, Potchefstroom 2531, South Africa
| | - Lehlohonolo Mofokeng
- Unit for Environmental Sciences and Management, North-West University, Private Bag X6001, Potchefstroom 2531, South Africa
| | - Michelo Syakalima
- Department of Animal Health, School of Agriculture, North-West University, Private Bag X2046, Mmabatho 2735, South Africa
- University of Zambia, School of Veterinary Medicine, Department of Disease Control, P.O. Box 32379, Lusaka, Zambia
| | - Kgaugelo E. Lekota
- Unit for Environmental Sciences and Management, North-West University, Private Bag X6001, Potchefstroom 2531, South Africa
| | - Oriel Thekisoe
- Unit for Environmental Sciences and Management, North-West University, Private Bag X6001, Potchefstroom 2531, South Africa
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Keddy KH, Saha S, Okeke IN, Kalule JB, Qamar FN, Kariuki S. Combating Childhood Infections in LMICs: evaluating the contribution of Big Data Big data, biomarkers and proteomics: informing childhood diarrhoeal disease management in Low- and Middle-Income Countries. EBioMedicine 2021; 73:103668. [PMID: 34742129 PMCID: PMC8579132 DOI: 10.1016/j.ebiom.2021.103668] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 09/26/2021] [Accepted: 10/20/2021] [Indexed: 01/20/2023] Open
Abstract
Despite efforts to reduce the global burden of childhood diarrhoea, 50% of all cases globally occur in children under five years in Low–Income and Middle- Income Countries (LMICs) and knowledge gaps remain regarding the aetiological diagnosis, introduction of diarrhoeal vaccines, and the role of environmental enteric dysfunction and severe acute malnutrition. Biomarkers may assist in understanding disease processes, from diagnostics, to management of childhood diarrhoea and the sequelae to vaccine development. Proteomics has the potential to assist in the identification of new biomarkers to understand the processes in the development of childhood diarrhoea and to aid in developing new vaccines. Centralised repositories that enable mining of large data sets to better characterise risk factors, the proteome of both the patient and the different diarrhoeal pathogens, and the environment, could inform patient management and vaccine development, providing a systems biological approach to address the burden of childhood diarrhoea in LMICs.
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Affiliation(s)
- Karen H Keddy
- Tuberculosis Platform, South African Medical Research Council, 1 Soutpansberg Rd, Pretoria, 0001, South Africa.
| | - Senjuti Saha
- Child Health Research Foundation, 23/2 Khilji Road, Mohammadpur, Dhaka 1207, Bangladesh
| | - Iruka N Okeke
- Department of Pharmaceutical Microbiology, Faculty of Pharmacy, University of Ibadan, Oyo State, Nigeria
| | - John Bosco Kalule
- Biotechnical and Diagnostic Sciences, College of Veterinary Medicine Animal Resources and Biosecurity, Makerere University, Uganda
| | - Farah Naz Qamar
- Department of Pediatrics and Child Health. Aga Khan University, Stadoum road Karachi, Pakistan 74800
| | - Samuel Kariuki
- Centre for Microbiology Research, Kenya Medical Research Institute, Off Mbagathi Road, Nairobi, Kenya
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Lv YJ, Hu QL, Huang R, Zhang L, Wu LF, Fu S. The Diagnostic and Therapeutic Value of the Detection of Serum Amyloid A and C-Reactive Protein in Infants with Rotavirus Diarrhea. Int J Gen Med 2021; 14:3611-3617. [PMID: 34295183 PMCID: PMC8291610 DOI: 10.2147/ijgm.s319915] [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: 05/14/2021] [Accepted: 06/21/2021] [Indexed: 11/25/2022] Open
Abstract
Objective This study explores the significance of serum amyloid A (SAA), C-reactive protein (CRP), and white blood cell (WBC) in the diagnosis and treatment of diarrhea in infants. Methods Specimens were collected from 126 children with diarrhea and 66 healthy children undergoing health examination. According to the results of stool culture and rotavirus (RV) antigen, these children were divided into three groups: rotavirus group (70 cases), bacterial infection (56 cases), and control groups (66 cases). On the fourth day of admission, children in the RV group underwent stool culture again. Based on the subsequent results, they were further divided into two groups, ie, no secondary bacterial infection and secondary bacterial infection groups. The levels of RV antigen, bacterial antigen, SAA, CRP, and WBC were detected in all children. Then, ROC curve analysis was performed to determine the diagnostic efficacy of SAA, CRP and WBC. Results The levels of SAA, CRP, and WBC for the RV group were lower than those of the bacterial infection group, but higher compared with the control group (P<0.05). The diagnostic efficacy of SAA was higher than that of CRP and WBC, with the area under the curve of 0.876, 0.803, and 0.765, respectively. The positive and negative predictive values, specificity, and sensitivity of SAA were slightly better compared with CRP and WBC. The SAA, CRP, and WBC levels of children with a bacterial infection in the RV group on the fourth and seventh days after admission were also significantly higher compared with children without bacterial infection. Conclusion Serum amyloid A, CRP, and WBC levels had a high value in the differential diagnosis of infantile diarrhea. As such, they can be used in the early diagnosis and curative efficacy assessment of children with diarrhea.
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Affiliation(s)
- Yin-Jiang Lv
- Department of Clinical Laboratory, The First People's Hospital of Yuhang District, Hangzhou, Hangzhou, Zhejiang, 311100, People's Republic of China
| | - Qi-Lei Hu
- Department of Clinical Laboratory, The First People's Hospital of Yuhang District, Hangzhou, Hangzhou, Zhejiang, 311100, People's Republic of China
| | - Rong Huang
- Department of Clinical Laboratory, The First People's Hospital of Yuhang District, Hangzhou, Hangzhou, Zhejiang, 311100, People's Republic of China
| | - Liang Zhang
- Department of Clinical Laboratory, The First People's Hospital of Yuhang District, Hangzhou, Hangzhou, Zhejiang, 311100, People's Republic of China
| | - Li-Feng Wu
- Department of Clinical Laboratory, The First People's Hospital of Yuhang District, Hangzhou, Hangzhou, Zhejiang, 311100, People's Republic of China
| | - Shui Fu
- Department of Clinical Laboratory, The First People's Hospital of Yuhang District, Hangzhou, Hangzhou, Zhejiang, 311100, People's Republic of China
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de Melo RT, Dumont CF, Braz RF, Monteiro GP, Takeuchi MG, Lourenzatto ECA, Dos Santos JP, Rossi DA. Genotypical Relationship Between Human and Poultry Strains of Campylobacter jejuni. Curr Microbiol 2021; 78:2980-2988. [PMID: 34089354 DOI: 10.1007/s00284-021-02553-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 05/26/2021] [Indexed: 11/30/2022]
Abstract
This study aimed to compare the genotype diversity of C. jejuni isolates. From the total of 64 C. jejuni strains evaluated, 44 were isolated from broiler carcasses (2015-2016) and 20 from hospitalized patients with gastroenteritis caused by the microorganism (2000-2006). The strains were correlated for the presence of flaA, pldA, cadF, ciaB, cdtABC, luxS, dnaJ, cbrA, htrA, pVir, Hcp, cstII, and neuA genes by PCR (polymerase chain reaction) and for phylogenetic proximity by PFGE (pulsed-field gel electrophoresis). Of the total strains studied, 28 (43.7%) presented all the studied genes, except pVir. Among these strains, 25 (89.3%) were of poultry origin. Poultry strains showed a higher prevalence (P < 0.05) of genes linked to adhesion, colonization, invasion, cytotoxicity, biofilm formation, and adaptation to adverse conditions. Additionally, the profile that denotes the presence of all genes identified in the study (P1) was identified in 56.8% of poultry strains and in 15.0% of human strains. Molecular typing analysis identified five pulsotypes, none of which grouped strains from different origins. Although human strains were from hospitalized patients, they presented limited virulence capacity and adaptability to adverse conditions compared to chicken carcasses, besides being different in molecular typing. However, the ability to cause Guillain-Barré Syndrome is equal for both strains. In general, poultry strains, being more recent, are more specialized to adapt to the environment, invade, and cause disease in the human host.
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Affiliation(s)
- Roberta Torres de Melo
- Laboratory of Molecular Epidemiology, Faculty of Veterinary Medicine, Federal University of Uberlândia, Ceará Street s/n, Block 2D 44, Umuarama, Uberlândia, MG, 38402-018, Brazil.
| | - Carolyne Ferreira Dumont
- Laboratory of Molecular Epidemiology, Faculty of Veterinary Medicine, Federal University of Uberlândia, Ceará Street s/n, Block 2D 44, Umuarama, Uberlândia, MG, 38402-018, Brazil
| | - Raquelline Figueiredo Braz
- Laboratory of Molecular Epidemiology, Faculty of Veterinary Medicine, Federal University of Uberlândia, Ceará Street s/n, Block 2D 44, Umuarama, Uberlândia, MG, 38402-018, Brazil
| | - Guilherme Paz Monteiro
- Laboratory of Molecular Epidemiology, Faculty of Veterinary Medicine, Federal University of Uberlândia, Ceará Street s/n, Block 2D 44, Umuarama, Uberlândia, MG, 38402-018, Brazil
| | - Micaela Guidotti Takeuchi
- Laboratory of Molecular Epidemiology, Faculty of Veterinary Medicine, Federal University of Uberlândia, Ceará Street s/n, Block 2D 44, Umuarama, Uberlândia, MG, 38402-018, Brazil
| | | | | | - Daise Aparecida Rossi
- Laboratory of Molecular Epidemiology, Faculty of Veterinary Medicine, Federal University of Uberlândia, Ceará Street s/n, Block 2D 44, Umuarama, Uberlândia, MG, 38402-018, Brazil
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A One Health approach to prevention, treatment, and control of campylobacteriosis. Curr Opin Infect Dis 2020; 32:453-460. [PMID: 31305492 DOI: 10.1097/qco.0000000000000570] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
PURPOSE OF REVIEW To review recent findings regarding the control and treatment of campylobacteriosis. RECENT FINDINGS The application of improved diagnostics has led to an upward shift in the attributable burden of Campylobacter infections, in both the United States and Europe as well as in resource-poor settings. Increased focus has brought a fundamental feature of campylobacteriosis -- the ability to cause relapsing disease back into focus, and expanding data on antimicrobial resistance has lead from a switch in first-line therapy for severe diarrhea from quinolones to azithromycin in most contexts, even as evidence of expanding macrolide resistance emerges. SUMMARY Campylobacter spp. infection is a common infection worldwide. Antibiotic-resistant Campylobacter spp. has become an emerging threat with the increase in industrial poultry production, as well as the broad use of antibiotics in both animals and humans.
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Igwaran A, Okoh AI. Occurrence, Virulence and Antimicrobial Resistance-Associated Markers in Campylobacter Species Isolated from Retail Fresh Milk and Water Samples in Two District Municipalities in the Eastern Cape Province, South Africa. Antibiotics (Basel) 2020; 9:E426. [PMID: 32708075 PMCID: PMC7400711 DOI: 10.3390/antibiotics9070426] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2019] [Revised: 02/11/2020] [Accepted: 02/14/2020] [Indexed: 12/02/2022] Open
Abstract
Campylobacter species are among the major bacteria implicated in human gastrointestinal infections and are majorly found in faeces of domestic animals, sewage discharges and agricultural runoff. These pathogens have been implicated in diseases outbreaks through consumption of contaminated milk and water in some parts of the globe and reports on this is very scanty in the Eastern Cape Province. Hence, this study evaluated the occurrence as well as virulence and antimicrobial-associated makers of Campylobacter species recovered from milk and water samples. A total of 56 water samples and 72 raw milk samples were collected and the samples were processed for enrichment in Bolton broth and incubated for 48 h in 10% CO2 at 42 °C under microaerobic condition. Thereafter, the enriched cultures were further processed and purified. After which, presumptive Campylobacter colonies were isolated and later confirmed by PCR using specific primers for the detection of the genus Campylobacter, target species and virulence associated genes. Antimicrobial resistance profiles of the isolates were determined by disk diffusion method against a panel of 12 antibiotics and relevant genotypic resistance genes were assessed by PCR assay. A total of 438 presumptive Campylobacter isolates were obtained; from which, 162 were identified as belonging to the genus Campylobacter of which 36.92% were obtained from water samples and 37.11% from milk samples. The 162 confirmed isolates were further delineated into four species, of which, 7.41%, 27.16% and 8.64% were identified as C. fetus, C. jejuni and C. coli respectively. Among the virulence genes screened for, the iam (32.88%) was most prevalent, followed by flgR (26.87%) gene and cdtB and cadF (5.71% each) genes. Of the 12 antibiotics tested, the highest phenotypic resistance displayed by Campylobacter isolates was against clindamycin (95.68%), while the lowest was observed against imipenem (21.47%). Other high phenotypic resistance displayed by the isolates were against erythromycin (95.06%), followed by ceftriaxone (93.21%), doxycycline (87.65%), azithromycin and ampicillin (87.04% each), tetracycline (83.33%), chloramphenicol (78.27%), ciprofloxacin (77.78%), levofloxacin (59.88%) and gentamicin (56.17%). Relevant resistance genes were assessed in the isolates that showed high phenotypic resistance, and the highest resistance gene harbored by the isolates was catII (95%) gene while VIM, KPC, Ges, bla-OXA-48-like, tetC, tetD, tetK, IMI and catI genes were not detected. The occurrence of this pathogen and the detection of virulence and antimicrobial resistance-associated genes in Campylobacter isolates recovered from milk/water samples position them a risk to human health.
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Affiliation(s)
- Aboi Igwaran
- SAMRC Microbial Water Quality Monitoring Centre, University of Fort Hare, Alice 5700, South Africa;
- Applied and Environmental Microbiology Research Group (AEMREG), Department of Biochemistry and Microbiology, University of Fort Hare, Private Bag X1314, Alice 5700, South Africa
| | - Anthony Ifeanyi Okoh
- SAMRC Microbial Water Quality Monitoring Centre, University of Fort Hare, Alice 5700, South Africa;
- Applied and Environmental Microbiology Research Group (AEMREG), Department of Biochemistry and Microbiology, University of Fort Hare, Private Bag X1314, Alice 5700, South Africa
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Chukwu MO, Luther King Abia A, Ubomba-Jaswa E, Obi L, Dewar JB. Characterization and Phylogenetic Analysis of Campylobacter Species Isolated from Paediatric Stool and Water Samples in the Northwest Province, South Africa. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2019; 16:E2205. [PMID: 31234440 PMCID: PMC6617328 DOI: 10.3390/ijerph16122205] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/23/2019] [Revised: 04/24/2019] [Accepted: 04/26/2019] [Indexed: 12/11/2022]
Abstract
Antibiotic-resistant Campylobacter could adversely affect treatment outcomes, especially in children. We investigated the antibiotic susceptibility profiles, virulence potentials and genetic relatedness of Campylobacter spp. from paediatric and water samples in the North West Province, South Africa. Overall, 237 human and 20 water isolates were identified using culture and real-time polymerase chain reaction (PCR). The antibiotic susceptibility profiles were determined using the disk diffusion method. Gradient strips were used to determine the minimum inhibitory concentration of each antibiotic. Antibiotic resistance (gryA, tetO and 23S rRNA 2075G and 2074C) and virulence (cadF and ciaB) genes were also investigated using PCR. A phylogenetic tree to ascertain the clonality between water and clinical isolates was constructed using MEGA 7. Overall, 95% (water) and 64.7% (human) of the isolates were resistant to at least one antibiotic tested. The highest resistance was against clarithromycin (95%) for water and ampicillin (60.7%) for human isolates. The 23S rRNA 2075G/2074C mutation was the most expressed resistance gene. Phylogenetic reconstruction revealed eight intermixed clades within water and human Campylobacter isolates. This study suggests the possible circulation of potentially pathogenic antibiotic-resistant Campylobacter in the Northwest Province, South Africa with drinking water being a possible vector for disease transmission in this area.
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Affiliation(s)
- Martina O Chukwu
- Department of Life and Consumer science, College of Agriculture and Environmental Sciences, University of South Africa, Corner Christiaan De wet and Pioneer Avenue, 1724 Florida park Roodepoort, Gauteng 1709, South Africa.
| | - Akebe Luther King Abia
- Antimicrobial Research Unit, College of Health Sciences, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa.
| | - Eunice Ubomba-Jaswa
- Department of Biotechnology, University of Johannesburg, 37 Nind Street, Doornfontein, Gauteng 2094, South Africa.
- Water Research Commission, Lynnwood Bridge Office Park, Bloukrans Building, 4 Daventry Street, Lynnwood Manor, Pretoria 0081, South Africa.
| | - Lawrence Obi
- Sefako Makgatho Health Science University, Molotlegi Street, Ga-Rankuwa,Pretoria, Gauteng, P.O Box 60, Medunsa 0204, South Africa.
| | - John Barr Dewar
- Department of Life and Consumer science, College of Agriculture and Environmental Sciences, University of South Africa, Corner Christiaan De wet and Pioneer Avenue, 1724 Florida park Roodepoort, Gauteng 1709, South Africa.
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