scholarly journals Evolution of Outbreak-Causing Carbapenem-Resistant Klebsiella pneumoniae ST258 at a Tertiary Care Hospital over 8 Years

mBio ◽  
2019 ◽  
Vol 10 (5) ◽  
Author(s):  
Jane W. Marsh ◽  
Mustapha M. Mustapha ◽  
Marissa P. Griffith ◽  
Daniel R. Evans ◽  
Chinelo Ezeonwuka ◽  
...  
Keyword(s):  
Health Care ◽  
Klebsiella Pneumoniae ◽  
Care Setting ◽  
Tertiary Care Hospital ◽  
Tertiary Care ◽  
Health Care Setting ◽  
Health Concern ◽  
Care Hospital ◽  
Content Type ◽  
Carbapenem Resistant

ABSTRACT Carbapenem-resistant Klebsiella pneumoniae (CRKP) strains belonging to sequence type 258 (ST258) are frequent causes of hospital-associated outbreaks and are a major contributor to the spread of carbapenemases. This genetic lineage emerged several decades ago and remains a major global health care challenge. In this study, genomic epidemiology was used to investigate the emergence, evolution, and persistence of ST258 carbapenem-resistant K. pneumoniae outbreak-causing lineages at a large tertiary care hospital over 8 years. A time-based phylogenetic analysis of 136 ST258 isolates demonstrated the succession of multiple genetically distinct ST258 sublineages over the 8-year period. Ongoing genomic surveillance identified the emergence and persistence of several distinct clonal ST258 populations. Patterns of multidrug resistance determinants and plasmid replicons were consistent with continued evolution and persistence of these populations. Five ST258 outbreaks were documented, including three that were caused by the same clonal lineage. Mutations in genes encoding effectors of biofilm production and iron acquisition were identified among persistent clones. Two emergent lineages bearing K. pneumoniae integrative conjugative element 10 (ICEKp10) and harboring yersiniabactin and colibactin virulence factors were identified. The results show how distinct ST258 subpopulations have evolved and persisted within the same hospital over nearly a decade. IMPORTANCE The carbapenem class of antibiotics is invaluable for the treatment of selected multidrug-resistant Gram-negative pathogens. The continued transmission of carbapenem-resistant bacteria such as ST258 K. pneumoniae is of serious global public health concern, as treatment options for these infections are limited. This genomic epidemiologic investigation traced the natural history of ST258 K. pneumoniae in a single health care setting over nearly a decade. We found that distinct ST258 subpopulations have caused both device-associated and ward-associated outbreaks, and some of these populations remain endemic within our hospital to the present day. The finding of virulence determinants among emergent ST258 clones supports the idea of convergent evolution of drug-resistant and virulent CRKP strains and highlights the need for continued surveillance, prevention, and control efforts to address emergent and evolving ST258 populations in the health care setting.

scholarly journals Outbreak Caused by Enterobacteriaceae Harboring NDM-1 Metallo-β-Lactamase Carried in an IncFII Plasmid in a Tertiary Care Hospital in Mexico City

2015 ◽  
Vol 59 (11) ◽  
pp. 7080-7083 ◽  
Author(s):  
Pedro Torres-González ◽  
Miriam Bobadilla-del Valle ◽  
Estrella Tovar-Calderón ◽  
Francisco Leal-Vega ◽  
Araceli Hernández-Cruz ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Mexico City ◽  
Tertiary Care Hospital ◽  
Bacterial Species ◽  
Tertiary Care ◽  
Enterobacter Cloacae ◽  
New Delhi ◽  
Care Hospital ◽  
Content Type ◽  
Carbapenem Resistant

ABSTRACTCarbapenem-resistantEnterobacteriaceaecarrying New Delhi metallo-β-lactamase 1 (NDM-1) have rarely been reported in Latin America. We report of an outbreak caused by ablaNDM-1-harboring plasmid spread through different bacterial species, includingEscherichia coli(ST617) andEnterobacter cloacae(ST182) isolates from the same patient and threeKlebsiella pneumoniaeisolates (ST22) derived from three epidemiologically related patients. IncFII plasmids were found in all strains. Measures to control the outbreak were applied successfully.

scholarly journals Population Structure of Klebsiella pneumoniae Causing Bloodstream Infections at a New York City Tertiary Care Hospital: Diversification of Multidrug-Resistant Isolates

2015 ◽  
Vol 53 (7) ◽  
pp. 2060-2067 ◽  
Author(s):  
Angela Gomez-Simmonds ◽  
Michelle Greenman ◽  
Sean B. Sullivan ◽  
Joshua P. Tanner ◽  
Madeleine G. Sowash ◽  
...  
Keyword(s):  
New York ◽  
New York City ◽  
Klebsiella Pneumoniae ◽  
York City ◽  
Tertiary Care Hospital ◽  
Tertiary Care ◽  
Bloodstream Infections ◽  
Mortality Rates ◽  
Care Hospital ◽  
Content Type

Despite the growing importance of carbapenem-resistantKlebsiella pneumoniae(CRKP), the clonal relationships between CRKP and antibiotic-susceptible isolates remain unclear. We compared the genetic diversity and clinical features of CRKP, third-generation and/or fourth-generation cephalosporin-resistant (Ceph-R)K. pneumoniae, and susceptibleK. pneumoniaeisolates causing bloodstream infections at a tertiary care hospital in New York City between January 2012 and July 2013. Drug susceptibilities were determined with the Vitek 2 system. Isolates underwent multilocus sequence typing and PCR sequencing of thewziandblaKPCgenes. Clinical and microbiological data were extracted from patient records and correlated with molecular data. Among 223 patients, we identified 272 isolates. Of these, 194 were susceptible, 30 Ceph-R, and 48 CRKP, belonging to 144 sequence types (STs). Susceptible (127 STs) and Ceph-R (20 STs) isolates were highly diverse. ST258 dominated CRKP strains (12 STs, with 63% ST258). There was minimal overlap in STs between resistance groups. TheblaKPC-3gene (30%) was restricted to ST258/wzi154, whereasblaKPC-2(70%) was observed for severalwziallele types. CRKP infections occurred more frequently among solid organ transplant (31%) and dialysis (17%) patients. Mortality rates were high overall (28%) and highest among CRKP-infected patients (59%). In multivariable analyses, advanced age, comorbidities, and disease severity were significant predictors of 30-day mortality rates, whereas theK. pneumoniaesusceptibility phenotype was not. Among CRKP infections, we observed a borderline significant association of increased mortality rates with ST258 and thewzi154 allele. Although the clonal spread of ST258 continues to contribute substantially to the dissemination of CRKP, non-ST258 strains appear to be evolving. Further investigations into the mechanisms promoting CRKP diversification and the effects of clonal backgrounds on outcomes are warranted.

Clonal relatedness and plasmid profiling of extensively drug-resistant New Delhi metallo-β-lactamase-producing Klebsiella pneumoniae clinical isolates

2021 ◽  
Author(s):  
Muhammad Usman Qamar ◽  
Hasan Ejaz ◽  
Timothy R Walsh ◽  
Asad Ali Shah ◽  
Dunia A Al Farraj ◽  
...  
Keyword(s):  
Klebsiella Pneumoniae ◽  
Dna Hybridization ◽  
Tertiary Care ◽  
Health Concern ◽  
New Delhi ◽  
Care Hospital ◽  
Carbapenem Resistant ◽  
Extensively Drug Resistant ◽  
Vitek 2 ◽  
Plasmid Profiling

Aim: Carbapenem-resistant Klebsiella pneumoniae (CR-KP) particularly New Delhi metallo-β-lactamase (NDM) is a serious public health concern globally. The aim of the study to determine the molecular epidemiology of blaNDM-producing clinically isolated K. pneumoniae. Methods: Carbapenem-resistant  K. pneumoniae isolates (n = 100) were collected from tertiary care hospital Lahore. Isolates were confirmed by VITEK® 2 system and MALDI-TOF. Minimum inhibitory concentration was performed by VITEK 2 and molecular characterization was done by PCR, PFGE, DNA hybridization and replicon typing. Results: Of 90 MBL-producing K. pneumoniae, 75 were NDM producers; 60 were NDM-1 and 11 NDM-5. A total of 27 K. pneumoniae belonged to ST11 and 14 to ST147. NDM positive isolates were 100% resistant to β-lactam antibiotics except for colistin. 13.3% isolates carried blaNDM on ∼140 kb plasmids. A total of 32 (52.4%) isolates were positive for IncA/C and 18 (29.5%) IncF/II. Conclusion: The extensively resistant lineage of NDM-producing K. pneumoniae is prevalent in the clinical setting.

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