Journal of Microbiology

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Colistin resistance in Enterobacter spp. isolates in Korea: Yoon-Kyoung Hong , Ji-Young Lee , Kwan Soo Ko; J. Microbiol. 2018;56(6):435-440. Published online June 1, 2018; DOI: https://doi.org/10.1007/s12275-018-7449-0

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We investigated the colistin resistance rate among 356 Enterobacter spp. clinical isolates from eight hospitals in Korea. Antibiotic susceptibility testing was performed by broth microdilution. While 51 of 213 (23.9%) Enterobacter cloacae isolates were colistin-resistant, only six of 143 (4.2%) E. aerogenes isolates showed resistance. We also identified the skip well phenotype in eight E. cloacae and three E. aerogenes isolates. Multilocus sequence typing for E. cloacae and randomly amplified polymorphic DNA analysis and enterobacterial repetitive intergenic consensus PCR for E. aerogenes revealed that clonal spreading of colistin-resistant and skip well Enterobacter spp. isolates had not occurred. In vitro time-kill assays were performed with three colistin-resistant, three skip well, and two colistin-susceptible isolates of E. cloacae and E. aerogenes. Inconsistent results were observed among isolates with skip well phenotypes; while some were eradicated by 2 mg/L colistin, others were not. This suggests that skip well isolates have differentiated into different categories. As the high rates of colistin resistance in E. cloacae detected are of clinical concern, continuous monitoring is warranted. In addition, the clinical implications and mechanisms of the skip well phenotype should be investigated to ensure the appropriate use of colistin against Enterobacter infections.

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Emergence of concurrently transmissible mcr-9 and carbapenemase genes in bloodborne colistin-resistant Enterobacter cloacae complex isolated from ICU patients in Kolkata, India
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Microbiology Spectrum.2025;[Epub] CrossRef
Colistin resistance among the Gram-negative nosocomial pathogens in India: a systematic review and meta-analysis
Sambit K. Dwibedy, Indira Padhy, Aditya K. Panda, Saswat S. Mohapatra
Journal of Chemotherapy.2024; : 1. CrossRef
Genomic Study of High-Risk Clones of Enterobacter hormaechei Collected from Tertiary Hospitals in the United Arab Emirates
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Polymyxin resistance in Enterobacter cloacae complex in Brazil: phenotypic and molecular characterization
Bianca Santos da Costa, Renata Stavracakis Peixoto, Orlando Carlos da Conceição Neto, Leilane da Silva Pontes, Thamirys Rachel Tavares e Oliveira, Camila Bastos Tavares Teixeira, Ivson Cassiano de Oliveira Santos, Melise Chaves Silveira, Daiana Cristina S
Brazilian Journal of Microbiology.2024; 55(4): 3541. CrossRef
Detection of Colistin Resistant Enterobacteria Isolates from Human Fecal Samples in the Greater Accra Region of Ghana
Emmanuel Udochukwu Osisiogu, Emmanuel Mawuli Nattah, Fareeda Ceeta Mahmoud, Calebina Ayeyi Appiah, Raphael Eyram Amemo
Research Journal of Microbiology.2023; 18(1): 72. CrossRef
Species identification, antibiotic resistance, and virulence in Enterobacter cloacae complex clinical isolates from South Korea
Michidmaral Ganbold, Jungyu Seo, Yu Mi Wi, Ki Tae Kwon, Kwan Soo Ko
Frontiers in Microbiology.2023;[Epub] CrossRef
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Shota Fukuzawa, Toyotaka Sato, Kotaro Aoki, Soh Yamamoto, Noriko Ogasawara, Chie Nakajima, Yasuhiko Suzuki, Motohiro Horiuchi, Satoshi Takahashi, Shin-ichi Yokota
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Stefan Börjesson, Michael S. M. Brouwer, Emma Östlund, Jenny Eriksson, Josefine Elving, Oskar Karlsson Lindsjö, Linda I. Engblom
Frontiers in Microbiology.2022;[Epub] CrossRef
High prevalence of colistin resistance and mcr-9/10 genes in Enterobacter spp. in a tertiary hospital over a decade
Weichao Liao, Yushan Cui, Jingjing Quan, Dongdong Zhao, Xinhong Han, Qiucheng Shi, Qian Wang, Yan Jiang, Xiaoxing Du, Xi Li, Yunsong Yu
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Ulrike Binsker, Annemarie Käsbohrer, Jens A Hammerl
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Antibiotics.2021; 10(10): 1185. CrossRef
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Mutations in the two component regulator systems PmrAB and PhoPQ give rise to increased colistin resistance in Citrobacter and Enterobacter spp.
Matthew E. Wand, J. Mark Sutton
Journal of Medical Microbiology .2020; 69(4): 521. CrossRef
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Markus Huemer, Srikanth Mairpady Shambat, Silvio D Brugger, Annelies S Zinkernagel
EMBO reports.2020;[Epub] CrossRef
PmrAB and PhoPQ Variants in Colistin-Resistant Enterobacter spp. Isolates in Korea
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Current Microbiology.2019; 76(5): 644. CrossRef
In vitro Activity of Pentamidine Alone and in Combination With Aminoglycosides, Tigecycline, Rifampicin, and Doripenem Against Clinical Strains of Carbapenemase-Producing and/or Colistin-Resistant Enterobacteriaceae
Tania Cebrero-Cangueiro, Rocío Álvarez-Marín, Gema Labrador-Herrera, Younes Smani, Elisa Cordero-Matía, Jerónimo Pachón, María Eugenia Pachón-Ibáñez
Frontiers in Cellular and Infection Microbiology.2018;[Epub] CrossRef

Imipenem-resistant Gram-negative bacterial isolates carried by persons upon medical examination in Korea: So Yeon Kim , Sang Yop Shin , Ji-Young Rhee , Kwan Soo Ko; J. Microbiol. 2017;55(8):612-618. Published online July 18, 2017; DOI: https://doi.org/10.1007/s12275-017-6555-8

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Abstract

Carbapenem-resistant Gram-negative bacteria (CR-GNB) have emerged and disseminated worldwide, become a great concern worldwide including Korea. The prevalence of fecal carriage of imipenem-resistant Gram-negative bacteria (IRGNB) in persons in Korea was investigated. Stool samples were collected from 300 persons upon medical examination. Samples were screened for IR-GNB by using MacConkey agar with 2 μl/ml imipenem. Species were identified by 16S rRNA gene sequence analysis, and antimicrobial susceptibility was determined by the broth microdilution method. In total, 82 IR-GNB bacterial isolates were obtained from 79 (26.3%) out of 300 healthy persons. Multilocus sequence typing analysis showed very high diversity among IR P. aeruginosa, S. maltophilia, and E. cloacae isolates, and pulsedfield gel electrophoresis revealed five main pulsotypes of IR P. mirabilis. As for the presence of metallo-β-lactamases (MBLs), only one IMP-25-producing S. marcescens isolate was identified. Although only one carbapenemase-producing isolate was identified, the high colonization rates with IRGNB isolates in this study is notable because carriers may be a reservoir for the dissemination of resistant pathogens within the community as well as in health care institutions.

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Global mapping of antibiotic resistance rates among clinical isolates of Stenotrophomonas maltophilia: a systematic review and meta-analysis
Narjess Bostanghadiri, Mohammad Sholeh, Tahereh Navidifar, Leila Dadgar-Zankbar, Zahra Elahi, Alex van Belkum, Davood Darban-Sarokhalil
Annals of Clinical Microbiology and Antimicrobials.2024;[Epub] CrossRef
Advances in the Microbiology of Stenotrophomonas maltophilia
Joanna S. Brooke
Clinical Microbiology Reviews.2021;[Epub] CrossRef
Clonal spreading of NDM-5 carbapenemase-producing Escherichia coli isolates in a hospital in South Korea
So Yeon Kim, Jungyu Seo, Juyoun Shin, Yeun-Jun Chung, In Young Jeon, Seon Jin Yun, Yeon-Sook Kim, Kwan Soo Ko
Diagnostic Microbiology and Infectious Disease.2020; 97(2): 115027. CrossRef

Research Support, Non-U.S. Gov'ts

NOTE] Involvement of Curli Fimbriae in the Biofilm Formation of Enterobacter cloacae: Sung-Min Kim , Hee-Woo Lee , Yeh-Wan Choi , Shuk-Ho Kim , Je-Chul Lee , Yoo-Chul Lee , Sung-Yong Seol , Dong-Taek Cho , Jungmin Kim; J. Microbiol. 2012;50(1):175-178. Published online February 27, 2012; DOI: https://doi.org/10.1007/s12275-012-2044-2

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Abstract: In this study, we examined the biofilm forming ability, the mRNA expression of curli genes and the morphologies of curli fimbriae and biofilms in clinical isolates of Enterobacter cloacae. The csgBA operon was found in 11 (78.6%) of the 14 isolates. The ability of E. cloacae isolates to form biofilms was significantly correlated with the mRNA expression level of the csgA and csgD genes. The curli protein fimbriae appeared as tangled fibers and the curli-proficient strain formed mature biofilms. Our data suggest that the expression of the curli fimbriae play an important role in biofilm formation in E. cloacae.

Impact of Genetically Modified Enterobacter cloacae on Indigenous Endophytic Community of Citrus sinensis Seedlings: Fernando Dini Andreote , Marcelo Jose Mortatti Gullo , Andre Oliveira de Souza Lima , Walter Maccheroni Junior , Joao Lucio Azevedo , Welington Luiz Araujo; J. Microbiol. 2004;42(3):169-173.

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Abstract: Enterobacter cloacae (strain PR2/7), a genetically modified endophyte (GME) in citrus plants, carrying different plasmids (pEC3.0/18, pCelE, pEglA and pGFP), was inoculated into Citrus sinensis seedlings under greenhouse conditions. The impact of this on the indigenous bacterial endophytic community was studied by analyses of 2 different morphologic groups. The germination rates of inoculated seeds were evaluated in greenhouse, and plasmid stability under in vitro conditions. Results demonstrated a great and diverse endophytic community inside plants, and specialization in tissue colonization by some bacterial groups, in different treatments. Shifts in seed germination rate were observed among treatments: in general, the PR2/7 harboring pEglA bacterial clone significantly reduced seed germination, compared to the PR2/7 harboring pEC3.0/18 clone. This suggests that the presence of the pEglA plasmid changes bacteria-seed interactions. The endophytic community of citrus seedlings changed according to treatment. In seedlings treated with the PR2/7 with pEglA clone, the population of group II decreased significantly, within the context of the total endophytic community. These results indicate that the application of GMEs induces shifts in the endophytic bacterial community of citrus seedlings.

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