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https://www.readbyqxmd.com/read/28713357/extensively-drug-resistant-klebsiella-pneumoniae-causing-nosocomial-bloodstream-infections-in-china-molecular-investigation-of-antibiotic-resistance-determinants-informing-therapy-and-clinical-outcomes
#1
Wenzi Bi, Haiyang Liu, Rhys A Dunstan, Bin Li, Von Vergel L Torres, Jianming Cao, Lijiang Chen, Jonathan J Wilksch, Richard A Strugnell, Trevor Lithgow, Tieli Zhou
The rise in diversity of antimicrobial resistance phenotypes seen in Klebsiella pneumoniae is becoming a serious antibiotic management problem. We sought to investigate the molecular characteristics and clinical implications of extensively drug-resistant (XDR) K. pneumoniae isolated from different nosocomial bloodstream infections (BSIs) patients from July 2013 to November 2015. Even in combination treatment, meropenem did not protect against mortality of BSIs patients (P = 0.015). In contrast, tigecycline in combination with other antimicrobial agents significantly protected against mortality (P = 0...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28711315/characterization-of-mobile-genetic-elements-carrying-vim-1-and-kpc-2-carbapenemases-in-citrobacter-freundii-isolates-in-madrid
#2
Jennifer Villa, David M Arana, Esther Viedma, Dafne Perez-Montarelo, Fernando Chaves
Carbapenemase producing Citrobacter freundii (CPCF) infections are still uncommon in European countries. Here we report a molecular study conducted in a tertiary care facility in southern Madrid, Spain, from 2009 to 2014 to investigate the epidemiology of CPCF. The blaIMP-1,blaIMP-2,blaKPC,blaNDM,blaOXA-48,blaVIM-1 and blaVIM-2 genes were screened by PCR. Molecular typing was carried out by Pulsed-field gel electrophoresis analysis (PFGE) and multilocus sequence typing (MLST). Whole genome sequencing (WGS) was performed to characterize the resistome and the mobile genetic elements associated with the carbapenems resistance of CPCF...
July 8, 2017: International Journal of Medical Microbiology: IJMM
https://www.readbyqxmd.com/read/28705769/the-plasmid-mediated-fosfomycin-resistance-determinants-and-synergy-of-fosfomycin-and-meropenem-in-carbapenem-resistant-klebsiella-pneumoniae-isolates-in-taiwan
#3
Sung-Pin Tseng, Sheng-Fan Wang, Ling Ma, Ting-Yin Wang, Tsung-Ying Yang, L Kristopher Siu, Yin-Ching Chuang, Pei-Shan Lee, Jann-Tay Wang, Tsu-Lan Wu, Jung-Chung Lin, Po-Liang Lu
BACKGROUND: Epidemiology of fosfomycin susceptibility and the plasmid-mediated fosfomycinase genes of carbapenem-resistant Klebsiella pneumoniae (CRKP) isolates in Taiwan remain unclear. METHODS: 642 CRKP clinical isolates were collected from a nation-wide surveillance study (16 hospitals) in Taiwan in 2012-2013. Antimicrobial susceptibilities were determined. PFGE and MLST determined the clonal relatedness. Carbapenemases and fosfomycinases genes were detected by PCR, and their flanking regions were determined by PCR and sequencing...
June 28, 2017: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/28668690/in-vivo-development-of-tigecycline-resistance-in-klebsiella-pneumoniae-due-to-deletion-of-ramr-ribosomal-binding-site
#4
Meiping Ye, Baixing Ding, Hongliang Qian, Qingqing Xu, Jianping Jiang, Jinwei Huang, Hongyu Ou, Fupin Hu, Minggui Wang
Tigecycline resistance is emerging among Klebsiella pneumoniae isolates, but knowledge on in vivo development of tigecycline resistance is limited. Here, we report a new mechanism of tigecycline resistance in K. pneumoniae which evolved during tigecycline therapy. K. pneumoniae isolates were consecutively obtained from urine samples of a patient with scrotal abscess and urinary tract infection before and during tigecycline treatment. Two tigecycline-resistant K. pneumoniae strains (KP-3R and KP-4R, MIC=8 µg/ml) were isolated after 41 and 47 days of tigecycline therapy...
June 28, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28560183/outbreak-by-hypermucoviscous-klebsiella-pneumoniae-st11-isolates-with-carbapenem-resistance-in-a-tertiary-hospital-in-china
#5
Lingling Zhan, Shanshan Wang, Yinjuan Guo, Ye Jin, Jingjing Duan, Zhihao Hao, Jingnan Lv, Xiuqin Qi, Longhua Hu, Liang Chen, Barry N Kreiswirth, Rong Zhang, Jingye Pan, Liangxing Wang, Fangyou Yu
Hypervirulent and multidrug resistant Klebsiella pneumoniae strains pose a significant threat to the public health. In the present study, 21 carbapenem-resistant K. pneumoniae isolates (CRKP) were determined by the string test as hypermucoviscous K. pneumoniae (HMKP), with the prevalence of 15.0% (21/140) among CRKP, and 1.1% (21/1838) among all K. pneumoniae isolates. Among them, 7 (33.3%), and 1 (4.76%) isolate belonged to capsular serotype K20 and K2 respectively, while 13 (61.9%, 13/21) weren't successfully typed by capsular serotyping...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28535790/clonal-replacement-of-epidemic-kpc-producing-klebsiella-pneumoniae-in-a-hospital-in-china
#6
Yuying Liang, Xiuyun Yin, Lijun Zeng, Shuiping Chen
BACKGROUND: Klebsiella pneumoniae is a frequent nosocomial pathogen causing difficult-to-treat infections worldwide. The prevalence of Klebsiella pneumoniae carbapenemase (KPC)-producing Klebsiella pneumoniae (KPC-KP) is increasing in China. The aim of this study was to investigate the molecular epidemiology of KPC-KP in a nosocomial outbreak. METHODS: Fifty-four KPC-KP isolates were consecutively collected between November 2013 and August 2014 during a KPC-KP outbreak in a tertiary care hospital in Beijing, China...
May 23, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28532799/characterization-of-pasteurella-multocida-associated-with-ovine-pneumonia-using-multi-locus-sequence-typing-mlst-and-virulence-associated-gene-profile-analysis-and-comparison-with-porcine-isolates
#7
Andrés García-Alvarez, Ana Isabel Vela, Elvira San Martín, Fernando Chaves, José Francisco Fernández-Garayzábal, Domínguez Lucas, Dolores Cid
Pasteurella multocida is a pathogen causing disease in a wide range of hosts including sheep and pigs. Isolates from ovine pneumonia were characterized by MLST (Multi-host and RIRDC databases) and virulence-associated gene (VAG) typing and compared with porcine isolates. Ovine and porcine isolates did not share any STs as determined by both schemes and exhibited different VAG profiles. With the Multi-host database, sixteen STs were identified among 43 sheep isolates with two STs (ST50 and ST19) comprising 53...
May 2017: Veterinary Microbiology
https://www.readbyqxmd.com/read/28512626/anti-restriction-protein-klcahs-promotes-dissemination-of-carbapenem-resistance
#8
Wei Liang, Yingzhou Xie, Wei Xiong, Yu Tang, Gang Li, Xiaofei Jiang, Yuan Lu
Carbapenemase-producing Klebsiella pneumoniae (KPC) has emerged and spread throughout the world. A retrospective analysis was performed on carbapenem-resistant K. pneumoniae isolated at our teaching hospital during the period 2009-2010, when the initial outbreak occurred. To determine the mechanism(s) that underlies the increased infectivity exhibited by KPC, Multilocus Sequence Typing (MLST) was conducted. A series of plasmids was also extracted, sequenced and analyzed. Concurrently, the complete sequences of blaKPC-2-harboring plasmids deposited in GenBank were summarized and aligned...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28479289/nationwide-surveillance-of-clinical-carbapenem-resistant-enterobacteriaceae-cre-strains-in-china
#9
Rong Zhang, Lizhang Liu, Hongwei Zhou, Edward Waichi Chan, Jiaping Li, Ying Fang, Yi Li, Kang Liao, Sheng Chen
The increasing incidence of carbapenem-resistant Enterobacteriaceae (CRE) - mediated hospital infections in China prompted a need to investigate the genetic basis of emergence of such strains. A nationwide survey was conducted in China covering a total of 1105 CRE strains collected from 25 geographical locales with results showing that acquisition of two carbapenemase genes, blaKPC-2 and blaNDM, was responsible for phenotypic resistance in 90% of the CRE strains tested (58% and 32% respectively), among which several major strain types, such as ST11 of K...
May 2017: EBioMedicine
https://www.readbyqxmd.com/read/28458208/international-high-risk-clones-of-klebsiella-pneumoniae-kpc-2-cc258-and-escherichia-coli-ctx-m-15-cc10-in-urban-lake-waters
#10
Tatiane Nascimento, Rodrigo Cantamessa, Luana Melo, Miriam R Fernandes, Edmir Fraga, Milena Dropa, Maria I Z Sato, Louise Cerdeira, Nilton Lincopan
The emergence of high-risk clones of multidrug-resistant (MDR) bacteria in aquatic environments has generated an important public health problem, creating an urgent need to strengthen surveillance. This study reports the occurrence of clinically significant MDR Enterobacteriaceae and non-fermentative bacteria carrying carbapenemases (KPC-2), extended-spectrum β-lactamases (CTX-M) and plasmid-mediated quinolone resistance (PMQR) genes in urban lakes and reservoirs, in Southeastern Brazil. In this regard, the detection of hospital-associated lineages of KPC-2-producing Klebsiella pneumoniae belonging to the international clonal complex CC258 (ST11) and CTX-M-15-producing Escherichia coli belonging to the international CC10 (ST617), in an urban lake, is reported for the first time...
November 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28437685/rapid-label-free-identification-of-klebsiella-pneumoniae-antibiotic-resistant-strains-by-the-drop-coating-deposition-surface-enhanced-raman-scattering-method
#11
Youjin Cheong, Young Jin Kim, Heeyoon Kang, Samjin Choi, Hee Joo Lee
Although many methodologies have been developed to identify unknown bacteria, bacterial identification in clinical microbiology remains a complex and time-consuming procedure. To address this problem, we developed a label-free method for rapidly identifying clinically relevant multilocus sequencing typing-verified quinolone-resistant Klebsiella pneumoniae strains. We also applied the method to identify three strains from colony samples, ATCC70063 (control), ST11 and ST15; these are the prevalent quinolone-resistant K...
April 20, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28437231/capsular-polysaccharide-types-and-virulence-related-traits-of-epidemic-kpc-producing-klebsiella-pneumoniae-isolates-in-a-chinese-university-hospital
#12
Yang Liu, Pan-Pan Liu, Lian-Hui Wang, Dan-Dan Wei, La-Gen Wan, Wei Zhang
Klebsiella pneumoniae is an important human pathogen associated with a variety of diseases and the prevalence of blaKPC carrying K. pneumoniae (KPC-Kp) is rapidly increasing. Capsule is an important virulence factor in K. pneumoniae. In this study, we determined to first systematically characterize capsular polysaccharide (CPS) and virulence traits in KPC-Kp strains. A total of 56 KPC-Kp isolates were recovered from clinical samples in a Chinese hospital, which were assigned to clonal lineages by multilocus sequence typing (MLST)...
February 24, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28396550/highly-tigecycline-resistant-klebsiella-pneumoniae-sequence-type-11-st11-and-st147-isolates-from-companion-animals
#13
Cristina M Ovejero, Jose Antonio Escudero, Daniel Thomas-Lopez, Andreas Hoefer, Gabriel Moyano, Natalia Montero, Carmen Martin-Espada, Bruno Gonzalez-Zorn
In this study, we characterized two tigecycline-resistant Klebsiella pneumoniae isolates from dog urine samples. The isolates were genetically unrelated, belonging to sequence type 11 (ST11) and ST147, both classically related to human isolates. To the best of our knowledge, this is the first identification of tigecycline-resistant isolates from animals. We unveil here the worrisome circulation among animals of bacterial clones resistant to this last-resort antibiotic.
June 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28375698/extended-spectrum-%C3%AE-lactamase-producing-klebsiella-pneumoniae-from-pharmaceutical-wastewaters-in-south-western-nigeria
#14
Avemaria Obasi, SimonCyril Nwachukwu, Esther Ugoji, Christian Kohler, André Göhler, Veronica Balau, Yvonne Pfeifer, Ivo Steinmetz
Emergence and spread of Klebsiella pneumoniae isolates producing extended-spectrum β-lactamases (ESBLs) present a major threat to public health. In this study, we characterized β-lactam-resistant K. pneumoniae isolates from six wastewater samples obtained from two pharmaceutical industries located in Lagos and Ogun States, Nigeria. Bacteria were isolated by using MacConkey agar; species identification and antibacterial susceptibility testing were performed by Vitek 2. Etest was used for ESBL phenotype confirmation...
April 4, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28337187/defining-and-evaluating-a-core-genome-multilocus-sequence-typing-scheme-for-whole-genome-sequence-based-typing-of-klebsiella-pneumoniae
#15
Haijian Zhou, Wenbing Liu, Tian Qin, Chen Liu, Hongyu Ren
At present, the most used methods for Klebsiella pneumoniae subtyping are multilocus sequence typing (MLST) and pulsed-field gel electrophoresis (PFGE). However, the discriminatory power of MLST could not meet the need for distinguishing outbreak and non-outbreak isolates and the PFGE is time-consuming and labor-intensive. A core genome multilocus sequence typing (cgMLST) scheme for whole-genome sequence-based typing of K. pneumoniae was developed for solving the disadvantages of these traditional molecular subtyping methods...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28333323/high-ceftazidime-hydrolysis-activity-and-porin-ompk35-deficiency-contribute-to-the-decreased-susceptibility-to-ceftazidime-avibactam-in-kpc-producing-klebsiella-pneumoniae
#16
Zhen Shen, Baixing Ding, Meiping Ye, Peng Wang, Yingmin Bi, Shi Wu, Xiaogang Xu, Qinglan Guo, Minggui Wang
Objectives: To investigate mechanisms for the decreased susceptibility to ceftazidime/avibactam in KPC-producing Klebsiella pneumoniae (KPC-KP). Methods: A total of 24 isolates, 8 each with ceftazidime/avibactam MICs of 4-8, 1-2 and ≤0.5 mg/L, were randomly selected from 214 clinical isolates of KPC-KP, and the β-lactamase hydrolysis activity and porin expression profiles were determined. Plasmid profile and relative expression and copy number of the bla KPC gene were also analysed...
March 15, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28303834/trends-in-spoligotype-patterns-of-mycobacterium-tuberculosis-strains-in-central-india
#17
Prabha Desikan, Devendra S Chauhan, Nikita Panwalkar, Pragya Sharma, Priyanka Yadav
This study aims to understand trends in spoligotype patterns of Mycobacterium tuberculosis (MTB) in Central India. Elucidation of these trends may provide baseline information to understand the transmission dynamics of strains of MTB in the region. Spoligotyping was carried out on 340 MTB strains isolated from clinical samples received from 2007 to 2011. The prevalence of ST26/CAS1_Del, ST11/EAI3_IND, ST288/CAS2, ST25/CAS1_Del and Beijing lineages showed waxing and waning trends. ST26/CAS1_Del and ST11/EAI3_IND lineages were consistently present and were predominant...
January 2017: Indian Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28280486/the-resistance-phenotype-and-molecular-epidemiology-of-klebsiella-pneumoniae-in-bloodstream-infections-in-shanghai-china-2012-2015
#18
Shu-Zhen Xiao, Su Wang, Wen-Man Wu, Sheng-Yuan Zhao, Fei-Fei Gu, Yu-Xing Ni, Xiao-Kui Guo, Jie-Ming Qu, Li-Zhong Han
Klebsiella pneumoniae (K.pneumoniae) is a common nosocomial pathogen causing bloodstream infections. Antibiotic susceptibility surveillance and molecular characterization will facilitate prevention and management of K. pneumoniae bloodstream infections. K. pneumoniae isolates causing bloodstream infections were consecutively collected between January 2012 and December 2015 in Shanghai. Eighty isolates (20 per year) were randomly selected and enrolled in this study. Drug susceptibility were determined by the disk diffusion method...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28185686/outbreak-of-kpc-2-producing-enterobacteriaceae-caused-by-clonal-dissemination-of-klebsiella-pneumoniae-st307-carrying-an-incx3-type-plasmid-harboring-a-truncated-tn4401a
#19
Jung Ok Kim, Sae Am Song, Eun-Jeong Yoon, Jeong Hwan Shin, Hyukmin Lee, Seok Hoon Jeong, Kyungwon Lee
Over a 5-month period between the end of June and the beginning of November in 2015, a KPC-producing Enterobacteriaceae outbreak occurred in a general hospital in Busan, South Korea, being associated with a total of 50 clinical isolates from 47 patients. Multilocus sequence typing and pulsed-field gel electrophoresis were carried out for strain typing and whole-genome sequencing was performed to characterize the plasmids. A clonal spread of K. pneumoniae sequence type 307 (ST307) carrying a self-transferable IncX3-type plasmid harboring blaKPC-2 was responsible for the outbreak...
April 2017: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/28167556/importance-of-clonal-complex-258-and-incfk2-like-plasmids-among-a-global-collection-of-klebsiella-pneumoniae-with-blakpc
#20
Gisele Peirano, Patricia A Bradford, Krystyna M Kazmierczak, Liang Chen, Barry N Kreiswirth, Johann D D Pitout
This study was designed to determine the global distribution of clonal complex (CC) 258 and IncFIIK2-like plasmids with blaKPC among 522 global Klebsiella pneumoniae carbapenemase (KPC)-producing K. pneumoniae isolates. CC258 (i.e., ST258 [clades I and II], ST11, ST340, and ST512) and ST147 were statistically associated with IncFIIK2-like KPC-containing plasmids and may possess an epidemiological advantage over isolates that harbored non-IncF KPC-harboring plasmids.
April 2017: Antimicrobial Agents and Chemotherapy
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