scholarly journals What's Lurking Around the Corner: Identifying Novel Carbapenem-Resistant Enterobacteriaceae Resistance Mechanisms in the Los Angeles County Healthcare Community, 2015

2016 ◽  
Vol 3 (suppl_1) ◽  
Author(s):  
Patricia Marquez ◽  
Nicole Green ◽  
Dawn Terashita ◽  
Sandeep Bhaurla ◽  
Laurene Mascola
Keyword(s):  
Los Angeles ◽  
Los Angeles County ◽  
Resistance Mechanisms ◽  
Carbapenem Resistant ◽  
Carbapenem Resistant Enterobacteriaceae

scholarly journals Multi-institute analysis of carbapenem resistance reveals remarkable diversity, unexplained mechanisms, and limited clonal outbreaks

2017 ◽  
Vol 114 (5) ◽  
pp. 1135-1140 ◽  
Author(s):  
Gustavo C. Cerqueira ◽  
Ashlee M. Earl ◽  
Christoph M. Ernst ◽  
Yonatan H. Grad ◽  
John P. Dekker ◽  
...  
Keyword(s):  
Carbapenem Resistance ◽  
Resistance Mechanisms ◽  
Phylogeographic Structure ◽  
Aggressive Approach ◽  
Beta Lactamases ◽  
Carbapenem Resistant ◽  
Local Transmission ◽  
California Hospital ◽  
Carbapenem Resistant Enterobacteriaceae ◽  
The Continuum

Carbapenem-resistant Enterobacteriaceae (CRE) are among the most severe threats to the antibiotic era. Multiple different species can exhibit resistance due to many different mechanisms, and many different mobile elements are capable of transferring resistance between lineages. We prospectively sampled CRE from hospitalized patients from three Boston-area hospitals, together with a collection of CRE from a single California hospital, to define the frequency and characteristics of outbreaks and determine whether there is evidence for transfer of strains within and between hospitals and the frequency with which resistance is transferred between lineages or species. We found eight species exhibiting resistance, with the majority of our sample being the sequence type 258 (ST258) lineage ofKlebsiella pneumoniae. There was very little evidence of extensive hospital outbreaks, but a great deal of variation in resistance mechanisms and the genomic backgrounds carrying these mechanisms. Local transmission was evident in clear phylogeographic structure between the samples from the two coasts. The most common resistance mechanisms were KPC (K. pneumoniaecarbapenemases) beta-lactamases encoded byblaKPC2,blaKPC3, andblaKPC4, which were transferred between strains and species by seven distinct subgroups of the Tn4401element. We also found evidence for previously unrecognized resistance mechanisms that produced resistance when transformed into a susceptible genomic background. The extensive variation, together with evidence of transmission beyond limited clonal outbreaks, points to multiple unsampled transmission chains throughout the continuum of care, including asymptomatic carriage and transmission of CRE. This finding suggests that to control this threat, we need an aggressive approach to surveillance and isolation.

Risk Factors and Molecular Epidemiology of Complicated Intra-Abdominal Infections With Carbapenem-Resistant Enterobacteriaceae: A Multicenter Study in China

2020 ◽  
Vol 221 (Supplement_2) ◽  
pp. S156-S163 ◽  
Author(s):  
Jiao Liu ◽  
Lidi Zhang ◽  
Jingye Pan ◽  
Man Huang ◽  
Yingchuan Li ◽  
...  
Keyword(s):  
Risk Factors ◽  
Klebsiella Pneumoniae ◽  
Hospital Mortality ◽  
Molecular Epidemiology ◽  
Carbapenem Resistance ◽  
Resistance Mechanisms ◽  
Carbapenem Resistant ◽  
Abdominal Infections ◽  
Hospital Acquired ◽  
Carbapenem Resistant Enterobacteriaceae

Abstract Background Carbapenem-resistant Enterobacteriaceae (CRE) infections are associated with poor patient outcomes. Data on risk factors and molecular epidemiology of CRE in complicated intra-abdominal infections (cIAI) in China are limited. This study examined the risk factors of cIAI with CRE and the associated mortality based on carbapenem resistance mechanisms. Methods In this retrospective analysis, we identified 1024 cIAI patients hospitalized from January 1, 2013 to October 31, 2018 in 14 intensive care units in China. Thirty CRE isolates were genotyped to identify β-lactamase-encoding genes. Results Escherichia coli (34.5%) and Klebsiella pneumoniae (21.2%) were the leading pathogens. Patients with hospital-acquired cIAI had a lower rate of E coli (26.0% vs 49.1%; P < .001) and higher rate of carbapenem-resistant Gram-negative bacteria (31.7% vs 18.8%; P = .002) than those with community-acquired cIAI. Of the isolates, 16.0% and 23.4% of Enterobacteriaceae and K pneumoniae, respectively, were resistant to carbapenem. Most carbapenemase-producing (CP)-CRE isolates carried blaKPC (80.9%), followed by blaNMD (19.1%). The 28-day mortality was 31.1% and 9.0% in patients with CRE vs non-CRE (P < .001). In-hospital mortality was 4.7-fold higher for CP-CRE vs non-CP-CRE infection (P = .049). Carbapenem-containing combinations did not significantly influence in-hospital mortality of CP and non-CP-CRE. The risk factors for 28-day mortality in CRE-cIAI included septic shock, antibiotic exposure during the preceding 30 days, and comorbidities. Conclusions Klebsiella pneumoniae had the highest prevalence in CRE. Infection with CRE, especially CP-CRE, was associated with increased mortality in cIAI.

scholarly journals Epidemic diffusion of KPC carbapenemase-producing Klebsiella pneumoniae in Italy: results of the first countrywide survey, 15 May to 30 June 2011

2013 ◽  
Vol 18 (22) ◽  
Author(s):  
T Giani ◽  
B Pini ◽  
F Arena ◽  
V Conte ◽  
S Bracco ◽  
...  
Keyword(s):  
Public Health ◽  
Klebsiella Pneumoniae ◽  
Clonal Complex ◽  
Public Health Problem ◽  
Resistance Mechanisms ◽  
Cross Sectional Survey ◽  
Cross Sectional ◽  
Carbapenem Resistant ◽  
Species Proportion ◽  
Carbapenem Resistant Enterobacteriaceae

Carbapenem-resistant Enterobacteriaceae (CRE) are emerging as a public health problem in various settings. In Italy, a rapid and remarkable increase of carbapenem-non-susceptible Klebsiella pneumoniae has been reported since 2010. Here we report on the results of a countrywide cross-sectional survey, carried out from 15 May to 30June 2011 to investigate the diffusion of CRE in Italy and to characterise the most prevalent resistance mechanisms and their dissemination patterns. CRE were reported from most (23 of 25) participating laboratories, with an overall proportion of 3.5% and 0.3% among consecutive non-duplicate clinical isolates of Enterobacteriaceae from inpatients (n=7,154) and outpatients (n=6,595), respectively. K. pneumoniae was the most frequent species (proportion of carbapenem-non-susceptible isolates: 11.9%), while a minority of CRE of other species were detected. Carbapenemase production was detected in the majority (85%) of CRE. KPC-type enzymes were by far the most common (89.5% of carbapenemase producers), followed by VIM-1 (9.2%) and OXA-48 (1.3%). KPC-producing K. pneumoniae (KPC-KP) were detected in most centres and contributed majorly to the epidemic dissemination of CRE recently observed in our country. Dissemination of KPC-KP was mostly sustained by strains of clonal complex 258 (ST-258 producing KPC-2 or KPC-3, and ST-512 producing KPC-3), while a minority belonged to ST-101.

scholarly journals Comparing the Outcomes of Patients With Carbapenemase-Producing and Non-Carbapenemase-Producing Carbapenem-Resistant Enterobacteriaceae Bacteremia

2016 ◽  
Vol 64 (3) ◽  
pp. 257-264 ◽  
Author(s):  
Pranita D Tamma ◽  
Katherine E Goodman ◽  
Anthony D Harris ◽  
Tsigereda Tekle ◽  
Ava Roberts ◽  
...  
Keyword(s):  
Antibiotic Treatment ◽  
Resistance Mechanism ◽  
Severity Of Illness ◽  
Carbapenem Resistance ◽  
Resistance Mechanisms ◽  
P Value ◽  
Carbapenem Resistant ◽  
Type 3 ◽  
Encoding Genes ◽  
Carbapenem Resistant Enterobacteriaceae

Abstract Background Carbapenem-resistant Enterobacteriaceae (CRE) are associated with considerable mortality. As mechanisms of carbapenem resistance are heterogeneous, it is unclear if mortality differs based on resistance mechanisms. We sought to determine whether CRE resistance mechanism determination is prognostically informative. Methods We conducted an observational study comparing 14-day mortality between patients with carbapenemase-producing (CP)-CRE compared with non-CP-CRE bacteremia. Clinical data were collected on all patients. A comprehensive DNA microarray-based assay was performed on all isolates to identify β-lactamase-encoding genes. Results There were 83 unique episodes of monomicrobial CRE bacteremia during the study period: 37 (45%) CP-CRE and 46 (55%) non-CP-CRE. The majority of CP-CRE isolates were blaKPC (92%), followed by blaNDM (5%) and blaOXA-48-type (3%). CP-CRE isolates were more likely to have meropenem minimum inhibitory concentrations (MICs) ≥16 µg/mL, while non-CP-CRE isolates were more likely to have meropenem MICs ≤1 µg/mL (P value < .001). A total of 18 (22%) patients died within 14 days, including 12 (32%) in the CP-CRE group and 6 (13%) in the non-CP-CRE group. Adjusting for severity of illness on day 1 of bacteremia, underlying medical conditions, and differences in antibiotic treatment administered, the odds of dying within 14 days were more than 4 times greater for CP-CRE compared with non-CP-CRE bacteremic patients (adjusted odds ratio, 4.92; 95% confidence interval, 1.01–24.81). Conclusion Our findings suggest that CP-CRE may be more virulent than non-CP-CRE and are associated with poorer outcomes. This underscores the added importance of delineating underlying resistance mechanisms of CRE to direct antibiotic treatment decisions.

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