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Zhu M, Yang G, Li A, Zong L, Dong Z, Lu J, Zhang K, Cheng C, Chang Q, Wu X, Ying J, Li X, Ding L, Zheng H, Yu J, Ying J, Xu T, Yi H, Li P, Li K, Wu S, Bao Q, Wang J. Identification and molecular characterization of Escherichia coli bla SHV genes in a Chinese teaching hospital. Gene 2016; 600:29-35. [PMID: 27889371 DOI: 10.1016/j.gene.2016.11.035] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Revised: 11/16/2016] [Accepted: 11/22/2016] [Indexed: 12/28/2022]
Abstract
Escherichia coli (E. coli) commonly reside in human intestine and most E. coli strains are harmless, but some serotypes cause serious food poisoning. This study identified and molecularly characterized blaSHV genes from 490 E. coli strains with multi-drug resistance in a hospital population. PCR and molecular cloning and southern blot were performed to assess functions and localizations of this resistant E. coli gene and the pulsed-field gel electrophoresis (PFGE) was utilized to demonstrate the clonal relatedness of the positive E. coli strains. The data showed that 4 of these 490 E. coli strains (4/499, 0.8%) carried blaSHV genes that included EC D2485 (blaSHV-5), EC D2487 (blaSHV-5), EC D2684 (blaSHV-11) and EC D2616 (blaSHV-195, a novel blaSHV). Analysis of blaSHV open-reading frame showed that blaSHV-5 had a high hydrolysis activity to the broad-spectrum penicillin (ampicillin or piperacillin), ceftazidime, ceftriaxone, cefotaxime and aztreonam. blaSHV-195 and blaSHV-11 had similar resistant characteristics with high hydrolysis activities to ampicillin and piperacillin, but low activities to cephalosporins. Moreover, the two blaSHV-5 genes were located on a transferable plasmid (23kb), whereas the other two blaSHV variants (blaSHV-11 and blaSHV-195) seemed to be located in the chromosomal material. Both EC D2485 and EC D2487 clones isolated in 2010 had the same DNA finger printing profile and they might be the siblings of clonal dissemination. The data from the current study suggest that the novel blaSHV and clonal dissemination may be developed, although blaSHV genes were infrequently identified in this hospital population. The results of the work demonstrate the necessity for molecular surveillance in tracking blaSHV-producing strains in large teaching hospital settings and emphasize the need for epidemiological monitoring.
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Affiliation(s)
- Mei Zhu
- School of Laboratory Medicine and Life Science/Institute of Biomedical Informatics, Wenzhou Medical University, Wenzhou 325000, China
| | - Guangjian Yang
- School of Laboratory Medicine and Life Science/Institute of Biomedical Informatics, Wenzhou Medical University, Wenzhou 325000, China
| | - Ailing Li
- School of Laboratory Medicine and Life Science/Institute of Biomedical Informatics, Wenzhou Medical University, Wenzhou 325000, China
| | - Li Zong
- School of Laboratory Medicine and Life Science/Institute of Biomedical Informatics, Wenzhou Medical University, Wenzhou 325000, China
| | - Zhaoguang Dong
- Shanghai Public Health Clinical Center, Shanghai 201508, China
| | - Junwan Lu
- School of Medicine, Lishui College, Lishui 323000, China
| | - Kaibo Zhang
- School of Medicine, Lishui College, Lishui 323000, China
| | - Cong Cheng
- School of Medicine, Lishui College, Lishui 323000, China
| | - Qingli Chang
- School of Laboratory Medicine and Life Science/Institute of Biomedical Informatics, Wenzhou Medical University, Wenzhou 325000, China
| | - Xiuying Wu
- Wenling Women's ﹠ Children's Hospital, Wenling 317500, China
| | - Jianchao Ying
- School of Laboratory Medicine and Life Science/Institute of Biomedical Informatics, Wenzhou Medical University, Wenzhou 325000, China
| | - Xianneng Li
- Wenling Women's ﹠ Children's Hospital, Wenling 317500, China
| | - Li Ding
- School of Laboratory Medicine and Life Science/Institute of Biomedical Informatics, Wenzhou Medical University, Wenzhou 325000, China
| | - Haixiao Zheng
- Wenling Women's ﹠ Children's Hospital, Wenling 317500, China
| | - Junping Yu
- Wenling Women's ﹠ Children's Hospital, Wenling 317500, China
| | - Jun Ying
- School of Laboratory Medicine and Life Science/Institute of Biomedical Informatics, Wenzhou Medical University, Wenzhou 325000, China
| | - Teng Xu
- School of Laboratory Medicine and Life Science/Institute of Biomedical Informatics, Wenzhou Medical University, Wenzhou 325000, China
| | - Huiguang Yi
- School of Laboratory Medicine and Life Science/Institute of Biomedical Informatics, Wenzhou Medical University, Wenzhou 325000, China
| | - Peizhen Li
- School of Laboratory Medicine and Life Science/Institute of Biomedical Informatics, Wenzhou Medical University, Wenzhou 325000, China
| | - Kewei Li
- School of Laboratory Medicine and Life Science/Institute of Biomedical Informatics, Wenzhou Medical University, Wenzhou 325000, China
| | - Songquan Wu
- School of Medicine, Lishui College, Lishui 323000, China
| | - Qiyu Bao
- School of Laboratory Medicine and Life Science/Institute of Biomedical Informatics, Wenzhou Medical University, Wenzhou 325000, China.
| | - Junrong Wang
- Wenling Women's ﹠ Children's Hospital, Wenling 317500, China.
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Multidrug-resistant phenotype and isolation of a novel SHV- beta-Lactamase variant in a clinical isolate of Enterobacter cloacae. J Biomed Sci 2015; 22:27. [PMID: 25888770 PMCID: PMC4407307 DOI: 10.1186/s12929-015-0131-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Accepted: 03/25/2015] [Indexed: 11/21/2022] Open
Abstract
Background ESBL-producing bacteria are a clinical problem in the management of diseases caused by these pathogens. Worldwide, systemic infections with BL enzymes are evolving by mutations from classical bla genes in an intensified manner and they continue to be transferred across species. Results E.cloacae BF1417 isolate and its transconjugants gave positive results with the DDST, suggesting the presence of ESBL. Sequence analysis revealed a blaSHV-ESBL-type gene that differs from the gene encoding SHV-1 by five point mutations resulting in three amino acid substitutions in the coding region: C123R, I282T and L286P. This novel SHV-type enzyme was designated SHV-128. The conjugation tests and plasmid characterization showed that the blaSHV-128 is located on a conjugative plasmid IncFII type. Expression studies demonstrated that the above mutations participated in drug resistance, hydrolysis of extended spectrum β-lactam and the change of the isoelectric point of the protein. Conclusion These findings underscore the diversity by which antibiotic resistance can arise and the evolutionary potential of the clinically important ESBL enzymes. In addition, this study highlights the need for systematic surveillance of ESBL-mediated resistance as well as in clinical areas and communities.
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Wu H, Xia X, Cui Y, Hu Y, Xi M, Wang X, Shi X, Wang D, Meng J, Yang B. Prevalence of extended-spectrum b-lactamase-producing Salmonella on retail chicken in six provinces and two national cities in the People's Republic of China. J Food Prot 2013; 76:2040-4. [PMID: 24290679 DOI: 10.4315/0362-028x.jfp-13-224] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Prevalence of extended-spectrum β-lactamase (ESBL)-producing Salmonella in food is not well documented. This study investigated the prevalence of ESBL-producing Salmonella in 699 Salmonella isolates recovered from 1,152 retail chickens collected from six provinces and two national cities in the People's Republic of China in 2011. ESBL-producing isolates were screened by double-disk synergy test and confirmed using PCR and DNA sequencing. Of the 699 isolates tested, 60 (8.58%) were identified to be ESBL-producing Salmonella. Prevalence of ESBL-producing Salmonella was the highest in Shanghai city (17 [24.64%] of 69), followed by Shaanxi (10 [15.38%] of 65), Fujian (9 [11.69%] of 77), Guangdong (9 [7.69%] of 117), Sichuan (5 [7.25%] of 69), Beijing (6 [5.17%] of 116), Henan (4 [4.65%] of 86), and Guangxi (0 [0%] of 100) province. Significant difference (P < 0.05) in the prevalence of ESBL-producing Salmonella was found among six provinces and two cities. No significant difference (P > 0.05) in the prevalence was found between wet markets and supermarkets or between whole chickens and chopped chickens. The prevalence of ESBL-producing Salmonella differed significantly (P < 0.05) among different seasons, being higher in autumn than in spring and winter. Overall, ESBL-producing Salmonella varied significantly (P < 0.05) among 12 detected Salmonella serotypes: Abony (1 [33.33%] of 3), Indiana (28 [28.57%] of 98), Edinburg (6 [24.00%] of 25), Shubra (2 [20.00%] of 10), Uppsala (1 [16.67%] of 6), Thompson (8 [14.81%] of 54), Haardt (1 [12.50%] of 8), Agona (3 [9.68%] of 31), Gueuletapee (1 [6.25%] of 16), Typhimurium (4 [5.56%] of 72), Heidelberg (1 [4.55%] of 22), and Enteritidis (4 [3.17%] of 126). This study revealed that ESBL-producing Salmonella do exist in retail chicken in the People's Republic of China and that the potential risk of their presence in foods needs further exploration.
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Affiliation(s)
- Haiyun Wu
- College of Food Science, Northwest A&F University, Yangling 712100, People's Republic of China
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