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Fang R, Jiang B, Xie J, Wang Z, Liang W, Yang Z, Lin LU, Peng Y, Nie K, Zeng Z, Huang B. An Optimized Multilocus Variable-Number Tandem Repeat Analysis Typing Scheme for Listeria monocytogenes from Three Western Provinces in China. J Food Prot 2018; 81:1956-1962. [PMID: 30457387 DOI: 10.4315/0362-028x.jfp-18-064] [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: 11/11/2022]
Abstract
Listeria monocytogenes is a foodborne pathogen worldwide. Multilocus variable-number tandem repeat analysis (MLVA) has been used for listeriosis surveillance and outbreak investigations. MLVA typing schemes have been proposed, but their usefulness for typing isolates from the People's Republic of China has not been assessed. To this aim, all L. monocytogenes strains (79) isolated from 1,445 raw meat and abattoir environmental samples of three western provinces in China were characterized with PCR serogrouping, multilocus sequence typing, and MLVA. The isolates were typed into the four PCR serogroups IIb (38.0%), IIc (26.6%), IIa (24.0%), and IVb (11.4%), with a Simpson's index (SI) of 0.7235. With multilocus sequence typing, they were typed into 18 sequence types (STs), including two new STs, ST1029 and ST1011, with an SI of 0.8880. With the 14 MLVA loci from the previous five schemes, the isolates were typed into 39 MLVA genotypes, with an SI of 0.9656. The typing data indicated that MLVA had the highest typing capability among the three methods. A subsequent optimization analysis identified an optimal combination of eight loci (LMV2, LMV9, LMV1, Lm10, Lm11, Lm15, Lm23, and LMTR6) producing the same SI as that of the 14 loci. The present optimized combination shared only six loci with the optimal nine-loci combination proposed in Australia, verifying for the first time that the optimal combinations varied with the isolates' sets. The current optimal typing scheme was ideal for L. monocytogenes isolates from western China.
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Affiliation(s)
- Rendong Fang
- 1 College of Animal Science and Technology, Southwest University, Beibei, Chongqing 400715, People's Republic of China
| | - Bing Jiang
- 1 College of Animal Science and Technology, Southwest University, Beibei, Chongqing 400715, People's Republic of China
| | - Jianhua Xie
- 2 Chongqing Animal Disease Prevention and Control Center, Chongqing Research Center for Prevention and Control of Swine Infectious Diseases, and Laboratory of Quality & Safety Risk Assessment for Animal Products on Biohazards, Ministry of Agriculture, Chongqing 401120, People's Republic of China
| | - Zichun Wang
- 2 Chongqing Animal Disease Prevention and Control Center, Chongqing Research Center for Prevention and Control of Swine Infectious Diseases, and Laboratory of Quality & Safety Risk Assessment for Animal Products on Biohazards, Ministry of Agriculture, Chongqing 401120, People's Republic of China
| | - Wangwang Liang
- 2 Chongqing Animal Disease Prevention and Control Center, Chongqing Research Center for Prevention and Control of Swine Infectious Diseases, and Laboratory of Quality & Safety Risk Assessment for Animal Products on Biohazards, Ministry of Agriculture, Chongqing 401120, People's Republic of China
| | - Zelin Yang
- 2 Chongqing Animal Disease Prevention and Control Center, Chongqing Research Center for Prevention and Control of Swine Infectious Diseases, and Laboratory of Quality & Safety Risk Assessment for Animal Products on Biohazards, Ministry of Agriculture, Chongqing 401120, People's Republic of China
| | - L U Lin
- 2 Chongqing Animal Disease Prevention and Control Center, Chongqing Research Center for Prevention and Control of Swine Infectious Diseases, and Laboratory of Quality & Safety Risk Assessment for Animal Products on Biohazards, Ministry of Agriculture, Chongqing 401120, People's Republic of China
| | - Yuanyi Peng
- 1 College of Animal Science and Technology, Southwest University, Beibei, Chongqing 400715, People's Republic of China
| | - Kui Nie
- 1 College of Animal Science and Technology, Southwest University, Beibei, Chongqing 400715, People's Republic of China
| | - Zheng Zeng
- 2 Chongqing Animal Disease Prevention and Control Center, Chongqing Research Center for Prevention and Control of Swine Infectious Diseases, and Laboratory of Quality & Safety Risk Assessment for Animal Products on Biohazards, Ministry of Agriculture, Chongqing 401120, People's Republic of China
| | - Bixing Huang
- 3 Public Health Virology, Queensland Health Forensic and Scientific Services, Department of Health, 39 Kessels Road, Coopers Plains, Queensland 4108, Australia (ORCID: http://orcid/org/0000-0002-7025-2292 )
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Rayner RE, Savill J, Hafner LM, Huygens F. Genotyping Streptococcus pneumoniae. Future Microbiol 2015; 10:653-64. [DOI: 10.2217/fmb.14.153] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
ABSTRACT Streptococcus pneumoniae is a potentially deadly human pathogen associated with high morbidity, mortality and global economic burden. The universally used bacterial genotyping methods are multilocus sequence typing and pulsed field gel electrophoresis. However, another highly discriminatory, rapid and less expensive genotyping technique, multilocus variable number of tandem repeat analysis (MLVA), has been developed. Unfortunately, no universal MLVA protocol exists, and some MLVA protocols do not amplify certain loci for all pneumococcal serotypes, leaving genotyping profiles incomplete. A number of other genotyping or characterization methods have been developed and will be discussed. This review examines the various protocols for genotyping S. pneumoniae and highlights the current direction technology and research is heading to understand this bacterium.
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Affiliation(s)
- Rachael E Rayner
- Institute of Health & Biomedical Innovation (IHBI), 60 Musk Ave, Kelvin Grove, 4059, Queensland, Australia
| | - John Savill
- Public Health Microbiology Laboratory, Queensland Health Forensic & Scientific Services, Coopers Plains, Queensland, Australia
| | - Louise M Hafner
- Queensland University of Technology (QUT), Brisbane, Queensland, Australia
| | - Flavia Huygens
- Institute of Health & Biomedical Innovation (IHBI), 60 Musk Ave, Kelvin Grove, 4059, Queensland, Australia
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Eglezos S, Dykes GA, Huang B, Turner MS, Seale R. Genetic characterization of Listeria monocytogenes isolates from food processing facilities before and after postcook chiller heat treatment. J Food Prot 2013; 76:1466-70. [PMID: 23905808 DOI: 10.4315/0362-028x.jfp-12-523] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Possible selection for and establishment of stress-resistant Listeria monocytogenes variants as a consequence of heating interventions is of concern to the food industry. Lineage analysis and multilocus variable number tandem repeat analysis (MLVA) was performed on 20 L. monocytogenes isolates, of which 15 were obtained before and 5 were obtained after heat treatment of a postcook meat chiller. The ctsR gene (a class III heat shock gene regulator) from 14 isolates was amplified and sequenced because previous work has indicated that spontaneous mutations can occur in this gene during heat treatment. Heat treatment of the meat chiller did not significantly change the relative abundance of the various L. monocytogenes lineages; lineage II strains (less-heat-resistant isolates) dominated both before and after heat treatment. MLVA typing confirmed that some isolates of L. monocytogenes occur both before and after heat treatment of the chiller. No isolate of L. monocytogenes indicated any likely functionally significant mutations in ctsR. This study indicates the absence of any obvious difference in the profiles of L. monocytogenes strains obtained before and after heat treatment of a meat chiller, based on the characteristics examined. Although this finding supports the effectiveness of heat treatment, the limited number of strains used and characteristics examined mean that further study on a larger scale is required before firm conclusions can be drawn.
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Affiliation(s)
- Sofroni Eglezos
- School of Agriculture and Food Sciences, University of Queensland, St Lucia, Queensland 4072, Australia.
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