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Renjie Wu, Ling-Xian Yi, Lin-Feng Yu, Jing Wang, Yiyun Liu, Xiaojie Chen, Luchao Lv, Jun Yang, Jian-Hua Liu
The objective of this study was to assess the impact of diverse plasmids bearing colistin resistance gene mcr-1 on host fitness. Forty-seven commensal E. coli isolates recovered from the pig farm where mcr-1 was first identified were screened for mcr-1. mcr-1 -bearing plasmids were characterized by sequencing. The fitness impact of mcr-1 -bearing plasmids was evaluated by in vitro competition assays. Twenty-seven (57.5%) E. coli isolates were positive for mcr-1 . The mcr-1 genes were mainly located on plasmids belonging to IncI2 ( n = 5), IncX4 ( n = 11), IncHI2/ST3 ( n = 8), IncFII ( n = 2), and IncY ( n = 2)...
2018: Frontiers in Microbiology
Hamid Solgi, Farzad Badmasti, Christian G Giske, Shadi Aghamohammad, Fereshteh Shahcheraghi
Objectives: Despite the fact that the blaOXA-48 and blaNDM-1 genes have successfully disseminated among Klebsiella pneumoniae isolates worldwide, outbreaks remain unidentified in Iran. Here we examined the molecular epidemiology of 96 carbapenem-resistant K. pneumoniae recovered from an Iranian hospital. Methods: A total of 96 non-replicate carbapenem-resistant K. pneumoniae were recovered from clinical specimens in a university hospital. Detection of ESBLs and carbapenemases produced by studied strains was performed using PCR and DNA sequencing...
March 6, 2018: Journal of Antimicrobial Chemotherapy
Torunn Pedersen, John Osei Sekyere, Usha Govinden, Krishnee Moodley, Audun Sivertsen, Ørjan Samuelsen, Sabiha Yusuf Essack, Arnfinn Sundsfjord
Whole-genome sequence analyses revealed the presence of bla NDM-1 ( n =31), bla GES-5 ( n =8), bla OXA-232 ( n =1), or bla NDM-5 ( n =1) in extensively drug-resistant and pandrug-resistant Enterobacteriaceae isolated from in-patients in 10 private hospitals (2012-2013) in Durban, South Africa. Two novel NDM-1 encoding plasmids from Klebsiella pneumoniae were closed by PacBio sequencing. In p19-10_01 (IncFIB(K), 223.434 bp) bla NDM-1 was part of a Tn 1548 -like structure (16.276 bp) delineated by IS 26 The multireplicon plasmid p18-43_01 (IncR_1/IncFIB(pB171)/IncFII(Yp); 212...
March 5, 2018: Antimicrobial Agents and Chemotherapy
Katharina Schaufler, Kathrin Nowak, Ariane Düx, Torsten Semmler, Laura Villa, Laye Kourouma, Karim Bangoura, Lothar H Wieler, Fabian H Leendertz, Sebastian Guenther
High-risk ESBL-producing Enterobacteriaceae (ESBL-E) have been described in wild birds and rodents worldwide. Rats are of special interest not only due to their indicator role for environmental pollution with multi-resistant bacteria but also as possible infection source. Data on the presence of high-risk ESBL-E in urban wildlife from Africa remain scarce, however. Twenty-nine animals from three different rat ( Rattus ) species were captured in the city of Conakry (Guinea, West Africa) in 2015. Rectal swabs were analyzed for ESBL-E using selective media...
2018: Frontiers in Microbiology
Liang-Xing Fang, Xing-Ping Li, Guo-Hui Deng, Shu-Min Li, Run-Shi Yang, Zuo-Wei Wu, Xiao-Ping Liao, Jian Sun, Ya-Hong Liu
We report a novel fusion plasmid pP2-3T co-integrating ST3-IncHI2 with IncFII plasmid backbone mediating multidrug resistance and virulence. Phylogenetic analysis and comparative genomic revealed that pP2-3T and other MDR ST3-IncHI2 plasmids clustered together representing a unique IncHI2 lineage that exhibited high conservation in backbones of plasmid, but possessed highly genetic plasticity in variable regions via acquiring numerous ARGs and fusing with other plasmids. Surveillance studies should be taken to monitor multiresistance IncHI2 plasmids among Enterobacteriaceae...
February 5, 2018: Antimicrobial Agents and Chemotherapy
Hao Xu, Xin Wang, Xiao Yu, Jing Zhang, Lihua Guo, Chen Huang, Xiawei Jiang, Xuewen Li, Youjun Feng, Beiwen Zheng
The wide spread of carbapenemase-producing Enterobacteriaceae (CPE) in the environment is an emerging environmental issue with potentially-serious public health implications. However, carbapenemase-producing Citrobacter from environment has rarely been investigated. Here we report the isolation and comparative genomics of carbapenemase-producing Citrobacter isolates from river sediment in China. Potential CPE was isolated by selective MacConkey agar plates containing 2 mg/L meropenem. The presence of carbapenemase genes was detected by PCR and sequencing...
January 19, 2018: Environmental Pollution
Pak-Leung Ho, Ya Wang, Melissa Chun-Jiao Liu, Eileen Ling-Yi Lai, Pierra Ying-Tung Law, Huiluo Cao, Kin-Hung Chow
Six imported pigs originating from Guangdong, Henan, and Hunan provinces in China during October 2015-February 2017 were culture positive for meropenem-resistant Escherichia coli The samples yielded 9 E. coli isolates of diverse sequence types carrying blaNDM-5 on IncX3 (8 isolates from 5 farms) or IncFII (1 isolate from 1 farm) plasmids. The mcr-1 gene was co-harboured by four isolates. The IncX3 plasmids (∼46 kb) carrying blaNDM-5 were identical or nearly identical to each other.
January 8, 2018: Antimicrobial Agents and Chemotherapy
Jingxian Liu, Jing Yu, Feng Chen, Jiajia Yu, Patricia Simner, Pranita Tamma, Ying Liu, Lisong Shen
The aim of this study was to investigate the characteristics of carbapenem-resistant Klebsiella pneumoniae (CRKP) collected during an outbreak in a Chinese teaching hospital and to provide insights into the prevention and control of nosocomial infection. We collected unique CRKP clinical isolates from 2009 to 2013. Antibiotic-resistant genes were identified by polymerase chain reaction (PCR) and sequencing. The isolates were typed using pulsed-field gel electrophoresis (PFGE) and multilocus sequence typing (MLST)...
December 27, 2017: European Journal of Clinical Microbiology & Infectious Diseases
Kai Zhou, Wei Yu, Ping Shen, Haifeng Lu, Baohong Wang, John W A Rossen, Yonghong Xiao
Genetic determinants of a clinical Klebsiella pneumoniae isolate (KP1814) coproducing IMP-4 and a rare ESBL gene SFO-1 was investigated. KP1814 belongs to a novel sequence type (ST) assigned to ST2270. WGS identified four circular DNA sequences in KP1814, including two multidrug-resistance (MDR) plasmids, one virulence plasmid, and one circular form. The MDR plasmid pKP1814-1 (299.9 Kb) is untypeable, and carries two large mosaic multiresistance regions (MRRs). blaSFO-1 and blaIMP-4 co-exists on MRR1, and blaSFO-1 is associated with an IS/Tn-independent genetic context...
December 11, 2017: Scientific Reports
João Anes, Daniel Hurley, Marta Martins, Séamus Fanning
Klebsiella pneumoniae is an important nosocomial pathogen with an extraordinary resistant phenotype due to a combination of acquired resistant-elements and efflux mechanisms. In this study a detailed molecular characterization of 11 K. pneumoniae isolates of clinical origin was carried out. Eleven clinical isolates were tested for their susceptibilities, by disk diffusion and broth microdilution and interpreted according to CLSI guidelines. Efflux activity was determined by measuring the extrusion of ethidium bromide and biofilm formation was assessed following static growth in Müeller-Hinton and minimal media M9 broths at two temperatures and time points...
2017: Frontiers in Microbiology
Sara Giordana Rimoldi, Bernardina Gentile, Cristina Pagani, Annamaria Di Gregorio, Anna Anselmo, Anna Maria Palozzi, Antonella Fortunato, Valentina Pittiglio, Anna Lisa Ridolfo, Maria Rita Gismondo, Giuliano Rizzardini, Florigio Lista
BACKGROUND: The emergence of carbapenem-resistant Klebsiella pneumoniae strains is threatening antimicrobial treatment. METHODS: Sixty-eight carbapenemase-producing K. pneumoniae strains isolated at Luigi Sacco University Hospital-ASST Fatebenefratelli Sacco (Milan, Italy) between 2012 and 2014 were characterised microbiologically and molecularly. They were tested for drug susceptibility and carbapenemase phenotypes, investigated by means of repetitive extra-genic palindromic polymerase chain reaction (REP-PCR), and fully sequenced by means of next-generation sequencing for the in silico analysis of multi-locus sequence typing (MLST), their resistome, virulome and plasmid content, and their core single nucleotide polymorphism (SNP) genotypes...
October 10, 2017: BMC Infectious Diseases
Yo Sugawara, Yukihiro Akeda, Noriko Sakamoto, Dan Takeuchi, Daisuke Motooka, Shota Nakamura, Hideharu Hagiya, Norihisa Yamamoto, Isao Nishi, Hisao Yoshida, Kazuhisa Okada, Khwar Nyo Zin, Mya Mya Aye, Kazunori Tomono, Shigeyuki Hamada
The bacterial enzyme New Delhi metallo-β-lactamase hydrolyzes almost all β-lactam antibiotics, including carbapenems, which are drugs of last resort for severe bacterial infections. The spread of carbapenem-resistant Enterobacteriaceae that carry the New Delhi metallo-β-lactamase gene, blaNDM, poses a serious threat to public health. In this study, we genetically characterized eight carbapenem-resistant Escherichia coli isolates from a tertiary care hospital in Yangon, Myanmar. The eight isolates belonged to five multilocus-sequence types and harbored multiple antimicrobial-resistance genes, resulting in resistance against nearly all of the antimicrobial agents tested, except colistin and fosfomycin...
2017: PloS One
Sandra Yamile Saavedra, Lorena Diaz, Magdalena Wiesner, Adriana Correa, Stefany Alejandra Arévalo, Jinnethe Reyes, Andrea Melissa Hidalgo, Elsa de la Cadena, Marcela Perenguez, Lucy Angeline Montaño, Javier Ardila, Rafael Ríos, María Victoria Ovalle, Paula Díaz, Paola Porras, Maria V Villegas, Cesar A Arias, Mauricio Beltrán, Carolina Duarte
Polymyxins are last-resort antimicrobial agents used to treat infections caused by carbapenem-resistant Enterobacteriaceae Due to the worldwide dissemination of polymyxin resistance in animal and human isolates, we aimed to characterize polymyxin resistance associated with the presence of mcr-1 in Enterobacteriaceae and nonfermenter Gram-negative bacilli, using isolates collected retrospectively in Colombia from 2002 to 2016. A total of 5,887 Gram-negative clinical isolates were studied, and 513 were found to be resistant to the polymyxins...
December 2017: Antimicrobial Agents and Chemotherapy
Xiaoyan Li, Yan Jiang, Kuihai Wu, Yong Zhou, Ruike Liu, Yan Cao, Aiwu Wu, Yurong Qiu
A carbapenem-resistant Salmonella enterica serovar Typhimurium (sequence type 34 [ST34]) strain was isolated from a fecal specimen from a child with acute diarrhea. Whole-genome sequencing revealed that the 84.5-kb IncFII plasmid pST41-NDM carrying the NDM-5 carbapenemase gene possesses a structure identical to that of the IncFII-type plasmid backbone. However, the blaNDM-5 flanking sequence found in this plasmid is identical to the blaNDM-5-positive IncX3 plasmids carried by 10 strains of Enterobacteriaceae identified in the same hospital...
September 8, 2017: Infection, Genetics and Evolution
Xinlei Jiang, Xuan Liu, Carmen O K Law, Ya Wang, Wai U Lo, Xing Weng, Ting Fung Chan, P L Ho, Terrence C K Lau
The dissemination of extended-spectrum β-lactamases (ESBLs) genes among bacteria is commonly achieved by plasmid conjugation. In the last decade, the CTX-M type enzyme was the most widespread and prevalent ESBLs in the world. In Hong Kong and mainland China, among the commonly found CTX-M-carrying plasmids were pHK01 and pHK01-like plasmids, which belong to incompatibility group FII (IncFII). In this work, we studied the physiological effect caused by the pHK01 plasmid in bacterial host Escherichia coli J53...
July 1, 2017: FEMS Microbiology Ecology
Juyoun Shin, Jin Yang Baek, Doo Ryeon Chung, Kwan Soo Ko
In this study, we characterized the blaNDM-5-bearing plasmid in a Klebsiella pneumoniae isolate that had lost the plasmid during serial passage. We determined the complete sequences of the plasmid pCC1410-2, which was extracted from a K. pneumoniae ST709 isolate collected at a Korean hospital from which two NDM-5-producing K. pneumoniae isolates were subsequently isolated. As a result, the pCC1410-2 plasmid had a backbone structure that was similar to those of two plasmids previously reported from the same hospital, but lacked some antibiotic resistance genes (blaTEM-1, rmtB, mphR(A), mrx(A), and mph(A))...
September 28, 2017: Journal of Microbiology and Biotechnology
Jiao Feng, Zhe Yin, Qiangyuan Zhao, Yachao Zhao, Defu Zhang, Xiaoyuan Jiang, Weili Wu, Weijun Chen, Hui Wang, Yajun Song, Yigang Tong, Jinglin Wang, Yanjun Li, Dongsheng Zhou
This study aimed to genetically characterize two fully-sequenced novel IncFII-type multidrug resistant (MDR) plasmids, p0716-KPC and p12181-KPC, recovered from two different clinical Klebsiella pneumoniae isolates. p0716-KPC and p12181-KPC had a very similar genomic content. The backbones of p0716-KPC/p12181-KPC contained two different replicons (belonging to a novel IncFII subtype and the Rep_3 family), the IncFIIK and IncFIIY maintenance regions, and conjugal transfer gene sets from IncFIIK-type plasmids and unknown origins...
July 19, 2017: Scientific Reports
Yan-Xian Yang, Yong-Qiang Yang, Chang-Wei Lei, Bi-Hui Liu, Wei Jiang, Hong-Ning Wang, Maria Consuelo Gazitúa, An-Yun Zhang
Recently, a novel variant of the CTX-M enzyme, CTX-M-98, was detected in Escherichia coli isolates from food animals. However, few plasmids carrying blaCTX-M-98 have been fully characterized. In this study, we sequenced the complete pHeBE7 plasmid, an 86,015-bp plasmid that contains the blaCTX-M-98b, blaTEM-1, rmtB, and traT genes, using whole-genome sequencing. The backbone of pHeBE7 shows a high similarity (>99%) to pMC-NDM, which carries the blaNDM-1 gene, however its mosaic regions remain relatively unique among sequenced plasmids...
July 6, 2017: Plasmid
Yawei Zhang, Kang Liao, Hua Gao, Qi Wang, Xiaojuan Wang, Henan Li, Ruobing Wang, Hui Wang
Although coexistence of blaNDM-5 and mcr-1 in Escherichia coli has been reported, little is known about the fitness and virulence of such strains. Three carbapenem-resistant Escherichia coli (GZ1, GZ2, and GZ3) successively isolated from one patient in 2015 were investigated for microbiological fitness and virulence. GZ1 and GZ2 were also resistant to colistin. To verify the association between plasmids and fitness, growth kinetics of the transconjugants were performed. We also analyzed genomic sequences of GZ2 and GZ3 using PacBio sequencing...
2017: Frontiers in Cellular and Infection Microbiology
M Doumith, J Findlay, H Hirani, K L Hopkins, D M Livermore, A Dodgson, N Woodford
Objectives: Klebsiella pneumoniae carbapenemase (KPC)-producing Enterobacteriaceae were first seen in the UK in 2003 and have been increasingly reported since 2010, largely owing to an ongoing outbreak in North-West England. We examined the role of clonal spread and plasmid transmission in their emergence. Methods: Isolates comprised KPC-positive K. pneumoniae ( n  =   33), Escherichia coli ( n  =   7) and Enterobacter spp. ( n  =   4) referred to the national reference laboratory between 2008 and 2010 from 17 UK centres, including three in North-West England...
August 1, 2017: Journal of Antimicrobial Chemotherapy
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