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Faula LL, Cerqueira MMOP, Madeira JEGC, Souza MR, Souza FN, Amancio GCS. Phenotypic and Genotypic Characterization of Salmonella Isolates Recovered from Foods Linked to Human Salmonellosis Outbreaks in Minas Gerais State, Brazil. J Food Prot 2022; 85:142-154. [PMID: 34525206 DOI: 10.4315/jfp-21-287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Accepted: 09/10/2021] [Indexed: 11/11/2022]
Abstract
ABSTRACT Salmonella is one of the primary pathogens that causes foodborne diseases worldwide. In the present study, we characterized Salmonella isolates recovered from foods linked to human salmonellosis outbreaks in Minas Gerais, Brazil, from 2003 to 2017. Serotype, antimicrobial susceptibility, presence of virulence genes, and genetic polymorphism as determined by repetitive element sequence-based PCR were determined for 70 Salmonella isolates. Thirteen Salmonella serotypes were identified, and the most prevalent were Enteritidis and Typhimurium, comprising 52 (74.3%) of the 70 isolates. Sixty-five (92.8%) of the isolates were resistant to at least 1 of the 15 antimicrobials tested. Ten isolates (14.2%) had a multidrug resistance phenotype. Isolates were screened for 16 virulence genes, which were found in 75.7 to 100% of the isolates. A statistical difference was found among Salmonella serotypes in the presence of the sipB, sopE, lfpA, sefA, and spvC genes. Based on their DNA fingerprints, 40 isolates of Salmonella Enteritidis from 16 outbreaks were separated into 14 groups and 12 isolates of Salmonella Typhimurium were separated into 6 groups. These serological patterns were similar to those reported by public health centers worldwide. Of concern is the high prevalence among the isolates in this study of both virulence genes and resistance to antimicrobials, especially to critically important drugs. Special attention should be given to Salmonella Enteritidis. Although the genomes of these Salmonella isolates were relatively variable, high genetic similarity was observed among them, and some had identical fingerprints. These results support the hypothesis of clonal circulation of Salmonella isolates causing human infections in Minas Gerais. HIGHLIGHTS
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Affiliation(s)
- Leandro L Faula
- Divisão de Vigilância Sanitária e Ambiental, Laboratório Central de Saúde Pública de Minas Gerais, Fundação Ezequiel Dias, Rua Conde Pereira Carneiro 80, Belo Horizonte 30510-010, Brazil.,Departamento de Tecnologia e Inspeção de Produtos de Origem Animal, Escola de Medicina Veterinária, Universidade Federal de Minas Gerais, Av. Presidente Antônio Carlos 6627, Belo Horizonte 31270-901, Brazil
| | - Monica M O P Cerqueira
- Departamento de Tecnologia e Inspeção de Produtos de Origem Animal, Escola de Medicina Veterinária, Universidade Federal de Minas Gerais, Av. Presidente Antônio Carlos 6627, Belo Horizonte 31270-901, Brazil
| | - Jovita E G C Madeira
- Divisão de Vigilância Sanitária e Ambiental, Laboratório Central de Saúde Pública de Minas Gerais, Fundação Ezequiel Dias, Rua Conde Pereira Carneiro 80, Belo Horizonte 30510-010, Brazil
| | - Marcelo R Souza
- Departamento de Tecnologia e Inspeção de Produtos de Origem Animal, Escola de Medicina Veterinária, Universidade Federal de Minas Gerais, Av. Presidente Antônio Carlos 6627, Belo Horizonte 31270-901, Brazil
| | - Fernando N Souza
- Departamento de Medicina Interna, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, Av. Prof. Dr. Orlando Marques de Paiva 87, São Paulo 05508-270, Brazil.,Programa de Pós Graduação em Ciência Animal, Universidade Federal da Paraíba, Areia 58397-000, Brazil
| | - Gláucia C S Amancio
- Divisão de Vigilância Sanitária e Ambiental, Laboratório Central de Saúde Pública de Minas Gerais, Fundação Ezequiel Dias, Rua Conde Pereira Carneiro 80, Belo Horizonte 30510-010, Brazil
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KARAGÖZ A, ALTINTAŞ L, ARSLANTAŞ T, TUTUN H, KOÇAK N, ALTINTAŞ Ö. Phenotypic and molecular characterization of Salmonella Enteritidis isolates. ANKARA ÜNIVERSITESI VETERINER FAKÜLTESI DERGISI 2020. [DOI: 10.33988/auvfd.691746] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Wang CL, Chen BY, Hsu CT, Wu R, Chou CH. Salmonella Contamination in Ready-to-Eat Tilapia Sashimi Processing Plants. J Food Prot 2019; 82:256-261. [PMID: 30677309 DOI: 10.4315/0362-028x.jfp-18-324] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
In this study, we investigated contamination rates and possible contamination routes of Salmonella in two typical tilapia sashimi processing plants in Taiwan. We found that the overall isolation rate was 5.0% ( n = 61), from a total of 1,218 samples collected in a year from different processing sections (freezing, scaling and bleeding, visceral removal, washing and disinfection, and packaging) and from different operating times (before processing and 3 and 6 h after processing began). In plant A, which is a relatively well-operated plant compared with plant B, Salmonella was only found in the freezing, scaling and bleeding, and visceral removal sections, with isolation rates ranging from 0 to 9.3%. No Salmonella was identified in the final ready-to-eat products at plant A. In plant B, Salmonella was found in all sections and in the final products, with isolation rates ranging from 4.6 to 36.1%. Regarding the processing times, the contamination rates increased significantly ( P < 0.05) 3 h after processing began in plant B. Among the isolates, 10 serotypes were detected, some of which are commonly observed in human salmonellosis cases in Taiwan, indicating a risk of zoonoses. However, only four isolates showed antimicrobial resistance in the current study. With molecular subtyping, we observed accumulated and persistent Salmonellae contamination patterns in plant B. These results suggest that inadequate sanitation impairs the foodborne pathogen control program in tilapia sashimi plants.
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Affiliation(s)
- Chia-Lan Wang
- 1 Zoonoses Research Center and School of Veterinary Medicine, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei City 106, Taiwan
| | - Bang-Yuan Chen
- 2 Department of Food Science, Fu Jen Catholic University, 510 Zhongzheng Road, New Taipei City 242, Taiwan
| | - Chia-Tzu Hsu
- 1 Zoonoses Research Center and School of Veterinary Medicine, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei City 106, Taiwan
| | - Rayean Wu
- 1 Zoonoses Research Center and School of Veterinary Medicine, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei City 106, Taiwan
| | - Chung-Hsi Chou
- 1 Zoonoses Research Center and School of Veterinary Medicine, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei City 106, Taiwan
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Abdel Aziz SA, Abdel-Latef GK, Shany SA, Rouby SR. Molecular detection of integron and antimicrobial resistance genes in multidrug resistant Salmonella isolated from poultry, calves and human in Beni-Suef governorate, Egypt. BENI-SUEF UNIVERSITY JOURNAL OF BASIC AND APPLIED SCIENCES 2018. [DOI: 10.1016/j.bjbas.2018.06.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
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Mirhosseini SA, Fooladi AAI, Amani J, Sedighian H. Production of recombinant flagellin to develop ELISA-based detection of Salmonella Enteritidis. Braz J Microbiol 2017; 48:774-781. [PMID: 28739413 PMCID: PMC5628325 DOI: 10.1016/j.bjm.2016.04.033] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2015] [Accepted: 04/04/2016] [Indexed: 01/22/2023] Open
Abstract
Food-borne diseases, caused by the pathogenic bacteria, are highly prevalent in the world. Salmonella is one of the most important bacterial genera responsible for this. Salmonella Enteritidis (SE) is one of the non-typhoid Salmonellae that can be transmitted to human from poultry products, water, and contaminated food. In recent years, new and rapid detection methods such as enzyme-linked immunosorbent assay (ELISA) and polymerase chain reaction (PCR) have been developed. In this study, recombinant FliC (rFliC) was produced to be used as an antigen. The immunization was conducted in mice with the purified recombinant FliC (rFliC). The mice were subcutaneously immunized with rFliC and elicited significant rFliC specific serum IgG antibodies. An indirect ELISA system was established for the detection of Salmonella Enteritidis. Our results confirmed that the recombinant flagellin can be one of the excellent indicators for the detection of Salmonella Enteritidis.
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Affiliation(s)
- Seyed Ali Mirhosseini
- Applied Microbiology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Abbas Ali Imani Fooladi
- Applied Microbiology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Jafar Amani
- Applied Microbiology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran.
| | - Hamid Sedighian
- Applied Microbiology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran
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Doosti A, Mokhtari-Farsani A, Chehelgerdi M. Molecular Characterization of Gyr-A
Gene Polymorphism in Salmonella Enterica
Serovar Enteritidis Isolated of Egg Shells. J Food Saf 2016. [DOI: 10.1111/jfs.12276] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Abbas Doosti
- Biotechnology Research Center, Islamic Azad University; Shahrekord Branch Shahrekord Iran
| | - Abbas Mokhtari-Farsani
- Biotechnology Research Center, Islamic Azad University; Shahrekord Branch Shahrekord Iran
- Young Researchers and Elite Club, Shahrekord Branch; Islamic Azad University; Shahrekord Iran
| | - Mohammad Chehelgerdi
- Biotechnology Research Center, Islamic Azad University; Shahrekord Branch Shahrekord Iran
- Young Researchers and Elite Club, Shahrekord Branch; Islamic Azad University; Shahrekord Iran
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Padilla-Frausto JJ, Cepeda-Marquez LG, Salgado LM, Iturriaga MH, Arvizu-Medrano SM. Detection and Genotyping of Leuconostoc spp. in a Sausage Processing Plant. J Food Prot 2015; 78:2170-6. [PMID: 26613911 DOI: 10.4315/0362-028x.jfp-15-192] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Some Leuconostoc spp. have the ability to produce slime and undesirable compounds in cooked sausage. The objectives of this research were to identify Leuconostoc sources in a Vienna-type sausage processing plant and to evaluate the genetic diversity of the isolated strains. Three hundred and two samples of sausage batter, sausages during processing, spoiled sausage, equipment surfaces, chilling brine, workers' gloves and aprons, and used casings were collected (March to November 2008 and February to April 2010) from a sausage processing plant. Lactic acid bacteria (LAB) were quantified, and Leuconostoc were detected using PCR. Strains were isolated and identified in Leuconostoc-positive samples. Leuconostoc strains were genotyped using randomly amplified polymorphic DNA and pulsed-field gel electrophoresis. LAB content of nonspoiled and spoiled sausage ranged from <0.8 to 4.4 log CFU/g and from 4.9 to 8.3 log CFU/g, respectively. LAB levels on equipment surfaces ranged from <1.3 to 4.8 log CFU/100 cm(2). Leuconostoc was detected in 35% of the samples, and 88 Leuconostoc spp. strains were isolated and genotyped. The main Leuconostoc spp. isolated were L. mesenteroides (37 genotypes), L. fallax (29 genotypes), and L. lactis (6 genotypes). Some strains of Leuconostoc isolated from equipment surfaces and sausages showed the same genotype. One L. lactis genotype included strains isolated from spoiled sausages analyzed in April 2008 and March to April 2010. Equipment and conveyor belts constitute Leuconostoc contamination sources. Leuconostoc persistence in the sausage processing environment and in the final product suggests the existence of microbial reservoirs, possibly on equipment surfaces.
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Affiliation(s)
- J J Padilla-Frausto
- Departamento de Ciencias Médicas y de la Vida, Centro Universitario de la Ciénega, Universidad de Guadalajara, Av. Universidad 1115, Col. Lindavista, Ocotlán Jalisco, México, CP 47820
| | - L G Cepeda-Marquez
- Departamento de Investigación y Posgrado en Alimentos, Facultad de Química, Universidad Autónoma de Querétaro, Cerro de las Campanas S/N, Col. las Campanas, Querétaro, Querétaro, México, CP 76010
| | - L M Salgado
- Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Instituto Poliécnico Nacional (CICATA-IPN), Cerro Blanco 141, Col. Colinas, Querétaro, Querétaro, México, CP 76090
| | - M H Iturriaga
- Departamento de Investigación y Posgrado en Alimentos, Facultad de Química, Universidad Autónoma de Querétaro, Cerro de las Campanas S/N, Col. las Campanas, Querétaro, Querétaro, México, CP 76010
| | - S M Arvizu-Medrano
- Departamento de Investigación y Posgrado en Alimentos, Facultad de Química, Universidad Autónoma de Querétaro, Cerro de las Campanas S/N, Col. las Campanas, Querétaro, Querétaro, México, CP 76010.
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Aguadero V, González Velasco C, Vindel A, Gonzalez Velasco M, Moreno JJ. Evaluation of rep-PCR/DiversiLab versus PFGE and spa typing in genotyping methicillin-resistant Staphylococcus aureus (MRSA). Br J Biomed Sci 2015; 72:120-7. [PMID: 26510268 DOI: 10.1080/09674845.2015.11666808] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Pulsed-field gel electrophoresis (PFGE) is the 'gold standard' for genotyping of methicillin-resistant Staphylococcus aureus (MRSA); however, the DiversiLab (DL) system, based on rep-PCR, is faster, simpler and could be better adapted to daily routine hospital work. We genotyped 100 MRSA isolates using PFGE, DL, and spa typing, and evaluated the discriminatory power of each technique and the correlation between them by Simpson's index(SI) and adjusted Rand coefficient (ARI), respectively. The isolates were from clinical samples from eight hospitals in Extremadura (Spain) during 2010. DL separated the 100 MRSA into 18 patterns, with 69% of the isolates grouped into four predominant patterns. spa typing reported 17 spa types, classifying 69% of MRSA into two major types (t067 and t002). PFGE revealed the existence of 27 patterns, gathering 54% of MRSA into three pulse types (E8a, E7a and E7b). SI values were 0.819, 0.726, 0.887 and 0.460 for DL, spa typing, PFGE and CC-BURP, respectively. ARI values of DL over PFGE, spa typing and CC-BURP were 0.151, 0.321 and 0.071, respectively. DL has less discriminatory power than PFGE but more than spa typing. The concordance of DL with PFGE is low, primarily because DL does not discriminate between the three predominant MRSA pulse types in our environment.
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Zhou X, He S, Song Q, Zhuang X, Wang Y, Huang X, Shi C, Shi X. Phenotypic and Genotypic Characterization ofSalmonella entericaSerovar Enteritidis Isolates Associated with a Mousse Cake–Related Outbreak of Gastroenteritis in Ningbo, China. Foodborne Pathog Dis 2015; 12:433-40. [DOI: 10.1089/fpd.2014.1896] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Xiujuan Zhou
- Ministry of Science and Technology of China (MOST)–U.S. Department of Agriculture Joint Research Center for Food Safety, School of Agriculture & Biology, and State Key Lab of Microbial Metabolism, Shanghai Jiao Tong University, Shanghai, China
| | - Shoukui He
- Ministry of Science and Technology of China (MOST)–U.S. Department of Agriculture Joint Research Center for Food Safety, School of Agriculture & Biology, and State Key Lab of Microbial Metabolism, Shanghai Jiao Tong University, Shanghai, China
| | - Qifa Song
- Ningbo Center for Disease Control and Prevention, Ningbo, Zhejiang, China
| | - Xiaofei Zhuang
- Ministry of Science and Technology of China (MOST)–U.S. Department of Agriculture Joint Research Center for Food Safety, School of Agriculture & Biology, and State Key Lab of Microbial Metabolism, Shanghai Jiao Tong University, Shanghai, China
| | - Yanyan Wang
- Ministry of Science and Technology of China (MOST)–U.S. Department of Agriculture Joint Research Center for Food Safety, School of Agriculture & Biology, and State Key Lab of Microbial Metabolism, Shanghai Jiao Tong University, Shanghai, China
| | - Xiaozhen Huang
- Ministry of Science and Technology of China (MOST)–U.S. Department of Agriculture Joint Research Center for Food Safety, School of Agriculture & Biology, and State Key Lab of Microbial Metabolism, Shanghai Jiao Tong University, Shanghai, China
| | - Chunlei Shi
- Ministry of Science and Technology of China (MOST)–U.S. Department of Agriculture Joint Research Center for Food Safety, School of Agriculture & Biology, and State Key Lab of Microbial Metabolism, Shanghai Jiao Tong University, Shanghai, China
| | - Xianming Shi
- Ministry of Science and Technology of China (MOST)–U.S. Department of Agriculture Joint Research Center for Food Safety, School of Agriculture & Biology, and State Key Lab of Microbial Metabolism, Shanghai Jiao Tong University, Shanghai, China
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Rodríguez R, Fandiño C, Donado P, Guzmán L, Verjan N. Characterization ofSalmonellafrom Commercial Egg-Laying Hen Farms in a Central Region of Colombia. Avian Dis 2015; 59:57-63. [DOI: 10.1637/10873-052714-reg] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Ozdemir K, Acar S. Plasmid profile and pulsed-field gel electrophoresis analysis of Salmonella enterica isolates from humans in Turkey. PLoS One 2014; 9:e95976. [PMID: 24852084 PMCID: PMC4031231 DOI: 10.1371/journal.pone.0095976] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Accepted: 03/31/2014] [Indexed: 11/30/2022] Open
Abstract
This study was conducted for typing Salmonella enterica subspecies enterica strains in Turkey using pulsed–field gel electrophoresis (PFGE) and plasmid DNA profile analysis. Fourty-two strains were isolated from clinical samples obtained from unrelated patients with acute diarrhea. The samples were collected from state hospitals and public health laboratories located at seven provinces in different regions of Turkey at different times between 2004 and 2010. The strains were determined to belong to 4 different serovars. The Salmonella enterica strains belonged to the serovars Salmonella Enteritidis (n = 23), Salmonella Infantis (n = 14), Salmonella Munchen (n = 2), and Salmonella Typhi (n = 3). Forty-two Salmonella enterica strains were typed with PFGE methods using XbaI restriction enzyme and plasmid analysis. At the end of typing, 11 different PFGE band profiles were obtained. Four different PFGE profiles (type 1, 4, 9, and 10) were found among serotype S. Enteritidis species, 3 different PFGE profiles (type 3, 5, 6) were found among S. Infantis species, 2 different PFGE profiles were found among S. Typhi species (type 2 and 11), and 2 different PFGE profiles were found among S. Munchen species (type 7, 8). The UPGMA dendrogram was built on the PFGE profiles. In this study, it was determined that 4 strains of 42 Salmonella enterica strains possess no plasmid, while the isolates have 1–3 plasmids ranging from 5.0 to 150 kb and making 12 different plasmid profiles (P1–P12). In this study, we have applied the analysis of the PFGE patterns and used bioinformatics methods to identify both inter and intra serotype relationships of 4 frequently encountered serotypes for the first time in Turkey.
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Affiliation(s)
- Kerem Ozdemir
- Yuzuncu Yıl University, Faculty of Science, Department of Biology, Van, Turkey
- * E-mail:
| | - Sumeyra Acar
- Public Health Institution of Turkey, Ankara, Turkey
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Isolation and molecular characterization of Salmonella enterica serovar Enteritidis from poultry house and clinical samples during 2010. Food Microbiol 2014; 38:67-74. [DOI: 10.1016/j.fm.2013.08.003] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2012] [Revised: 07/12/2013] [Accepted: 08/09/2013] [Indexed: 11/22/2022]
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Hyeon JY, Chon JW, Park JH, Kim MS, Oh YH, Choi IS, Seo KH. A Comparison of Subtyping Methods for Differentiating Salmonella enterica Serovar Enteritidis Isolates Obtained from Food and Human Sources. Osong Public Health Res Perspect 2013; 4:27-33. [PMID: 24159526 PMCID: PMC3747678 DOI: 10.1016/j.phrp.2012.12.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2012] [Revised: 12/15/2012] [Accepted: 12/19/2012] [Indexed: 11/14/2022] Open
Abstract
Purpose: To evaluate the abilities of these subtyping methods, we distinguished Salmonella Enteritidis (S. Enteritidis) isolated from food products and human clinical samples between 2009 and 2010 in Seoul using five subtyping methods. Methods: We determined the subtypes of 20 S. Enteritidis isolates from food and human sources using phage typing, antimicrobial susceptibility, pulsed-field gel electrophoresis (PFGE), repetitive sequence-based PCR (rep-PCR), and multi-locus sequence typing (MLST). Results: A total of 20 tested isolates were differentiated into six antimicrobial susceptibility patterns, three different phage types, four different PFGE profiles, seven rep-PCR patterns, and one MLST type. Food isolates were considerably more susceptible to antibiotics than human isolates. We were best able to discriminate among S. Enteritidis isolates using rep-PCR, and obtained the highest Simpson’s diversity index of 0.82, whereas other methods produced indices that were less than 0.71. PFGE pattern appeared to be more related to antimicrobial resistance and phage types of S. Enteritidis isolates than rep-PCR. MLST revealed identical alleles in all isolates at all seven loci examined, indicating no resolution. Conclusion: The results of this study suggest that rep-PCR provided the best discriminatory power for phenotypically similar S. Enteritidis isolates of food and human origins, whereas the discriminatory ability of MLST may be problematic because of the high sequence conservation of the targeted genes.
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Affiliation(s)
- Ji-Yeon Hyeon
- College of Veterinary Medicine, Konkuk University, Seoul, Korea . ; Division of Vaccine Research, Korea National Institute of Health, Osong, Korea
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Momeni SS, Whiddon J, Moser SA, Cheon K, Ruby JD, Childers NK. Comparative genotyping of Streptococcus mutans by repetitive extragenic palindromic polymerase chain reaction and multilocus sequence typing. Mol Oral Microbiol 2012. [PMID: 23194334 DOI: 10.1111/omi.12002] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The genetic diversity of Streptococcus mutans has been extensively studied using a variety of genotyping methods. Repetitive extragenic palindromic-polymerase chain reaction (rep-PCR) is a genotyping approach used for screening large numbers of bacterial isolates. This two-part study used multilocus sequence typing (MLST) analysis to evaluate genotypes previously identified as unique using rep-PCR. In part one, an isolate was selected from each of the 22 S. mutans rep-PCR genotype groups representing 8000 clinical isolates. For part two, four additional isolates were selected from the six most commonly occurring genotype groups (GG) for further analysis. Real-time PCR was performed using eight housekeeping S. mutans gene loci and the amplicons were sequenced. Sequence data analysis was performed using CLC DNA Workbench and alleles were compared with the PubMLST database for Oral Streptococcus using the Nakano scheme. Concatenated sequences were evaluated with MEGA using a minimum evolution method with bootstrap. All 22 rep-PCR genotypes were unique by MLST analysis. Within rep-PCR GGs, MLST matched rep-PCR in three groups demonstrating clonality; three groups exhibited more diversity with MLST. The discovery of three clonal groups is unique to this study and suggests that S. mutans genotypes are shared between unrelated subjects. Furthermore, MLST defined 19 new alleles and 26 new sequence types that have been confirmed and registered with PubMLST. Methods for processing were streamlined and a process for using MLST with rep-PCR is suggested. In conclusion, MLST verified that rep-PCR is a reliable and cost-effective method for screening large numbers of S. mutans strains for epidemiological study.
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Affiliation(s)
- S S Momeni
- Department of Pediatric Dentistry, University of Alabama School of Dentistry, Birmingham, AL, USA
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Chon JW, Kim JH, Lee SJ, Hyeon JY, Seo KH. Toxin profile, antibiotic resistance, and phenotypic and molecular characterization of Bacillus cereus in Sunsik. Food Microbiol 2012; 32:217-22. [DOI: 10.1016/j.fm.2012.06.003] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2011] [Revised: 06/07/2012] [Accepted: 06/12/2012] [Indexed: 01/24/2023]
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16
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Hyeon JY, Chon JW, Choi IS, Park C, Kim DE, Seo KH. Development of RNA aptamers for detection of Salmonella Enteritidis. J Microbiol Methods 2012; 89:79-82. [PMID: 22310030 DOI: 10.1016/j.mimet.2012.01.014] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2012] [Revised: 01/20/2012] [Accepted: 01/21/2012] [Indexed: 10/14/2022]
Abstract
We developed and evaluated RNA aptamers to analyze their potential for use in detecting Salmonella Enteritidis. The selected aptamer was observed to specifically bind to Salmonella Enteritidis without any cross-reactivity to other Salmonella serovars. Thus, this study suggests that aptamers specific to Salmonella Enteritidis have a high potential for use in presumptive presumptive screening methods or alternative serotyping methods.
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Affiliation(s)
- Ji-Yeon Hyeon
- KU Center for Food Safety, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701, South Korea
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Distribution and Genetic Diversity of Salmonella enterica in the Upper Suwannee River. Int J Microbiol 2011; 2011:461321. [PMID: 22347228 PMCID: PMC3278925 DOI: 10.1155/2011/461321] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2011] [Revised: 10/07/2011] [Accepted: 10/07/2011] [Indexed: 11/20/2022] Open
Abstract
The Suwannee River spans the Florida/Georgia border to the Gulf of Mexico, and contributes to regional irrigation and recreational activities. Association of Salmonella enterica with these resources may result in the contamination of produce and disease outbreaks. Therefore, surface water was examined for the distribution of S. enterica at multiple time points from 4 sites on the upper Suwannee River. Isolates were confirmed by detection of the invA gene, and 96% of all samples were positive for the bacterium. Most probable number enumeration ranged from <18 to 5400 MPN/100 mL. Genetic diversity of these isolates (n=110) was compared to other environmental (n=47) or clinical (n=28) strains and to an online library (n=314) using DiversiLab rep-PCR. All strains showed >60% similarity and distributed into 16 rep-PCR genogroups. Most (74%) of the Suwannee River isolates were clustered into two genogroups that were comprised almost exclusively (97%) of just these isolates. Conversely, 85% of the clinical reference strains clustered into other genogroups. However, some Suwannee River isolates (12%) were clustered with these primarily clinically-associated genogroups, supporting the hypothesis that river water can serve as a disease reservoir and that pathogenic strains may persist or possibly originate from environmental sources.
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Chenu JW, Cox JM, Pavic A. Classification of Salmonella enterica serotypes from Australian poultry using repetitive sequence-based PCR. J Appl Microbiol 2011; 112:185-96. [PMID: 21981579 DOI: 10.1111/j.1365-2672.2011.05172.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AIMS To evaluate a semi-automated repetitive extragenic palindromic sequence-based PCR (rep-PCR) system for the classification of Salmonella serotypes from Australian poultry. METHODS AND RESULTS Using a DNA fingerprint library within the DiversiLab(®) System, four separate databases were constructed (serogroup B, C, E and Other). These databases contained 483 serologically confirmed (reference laboratory) Salmonella isolates. A blinded set of Salmonella cultures (n = 155) were typed by rep-PCR, matched against the internal library and compared with traditional serotyping. The predicted (Kullback-Leibler) serotype of 143 (92·3%) isolates matched traditional typing (P < 0·05). Of the 12 (7·7%) remaining isolates, ten (6·5%) resulted in 'No Match', one (0·65%) was incorrectly matched to the library (Salm. subsp 1 ser 4,12:-:-), and the other (0·65%) was referenced as Salm. ser. Sofia, whereas rep-PCR and in-house serotyping concurred as Salmonella serovar Typhimurium. Financial analysis showed higher material cost (215%) and a lower labour component (47·5%) for rep-PCR compared with serotyping. CONCLUSION The DiversiLab(®) System, with serogroup databases, was successfully implemented as an adjunct for reference serotyping of Salmonella enterica. SIGNIFICANCE AND IMPACT OF THE STUDY The DiversiLab(®) System platform is a cost-effective and easy-to-use system, which can putatively determine Salmonella enterica serotypes within a few hours.
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Affiliation(s)
- J W Chenu
- Birling Avian Laboratories, Bringelly, NSW, Australia
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Hyeon JY, Chon JW, Hwang IG, Kwak HS, Kim MS, Kim SK, Choi IS, Song CS, Park C, Seo KH. Prevalence, antibiotic resistance, and molecular characterization of Salmonella serovars in retail meat products. J Food Prot 2011; 74:161-6. [PMID: 21219782 DOI: 10.4315/0362-028x.jfp-10-327] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The prevalence of Salmonella was determined in chicken meat (n = 26), beef (n = 49), and pork (n = 56) collected from wholesale markets, retail stores, and traditional markets in Seoul, South Korea, in 2009. Antibiotic resistance was assessed, and the molecular subtypes of Salmonella isolates were ascertained using an automated repetitive sequence-based PCR (rep-PCR) system (DiversiLab). A total of 18 Salmonella strains were isolated from 17 of 131 samples: 16 strains from each of 16 samples and 2 strains from the same pork sample. The prevalence of Salmonella from the retail meats was 2.0% in beef, 8.9% in pork, and 42.3% in chicken meat. Among 10 different serotypes, Salmonella enterica Panama was recovered from a beef sample, and Salmonella London and Salmonella Montevideo were the predominant serotypes from pork and chicken meat, respectively. The highest antibiotic resistance observed was to erythromycin (100%) followed by streptomycin (22.2%) and tetracycline and chloramphenicol (16.7%). Of the 18 isolates, 5 (27.8%) were resistant to two or more antibiotics, and 1 isolate from chicken meat was resistant to eight antibiotics, including cephalosporins. Differentiation between all of the Salmonella isolates except between Salmonella Montevideo and Salmonella London was successfully performed with the automated rep-PCR system, indicating that it can be added to the toolbox for source tracking of foodborne pathogens associated with outbreaks.
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Affiliation(s)
- Ji-Yeon Hyeon
- Department of Public Health, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701, South Korea
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