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129 results for “Klebsiella pneumoniae”
Characterization of cefiderocol resistant spontaneous mutant variants of Klebsiella pneumoniae producing NDM-5 with single mutation in cirA
<p>Cefiderocol (CFDC) is a siderophore-cephalosporin antibiotic designed to combat highly resistant Gram-negative bacterial infections. Its mechanism involves a strong affinity for iron and active transport into bacterial cells, providing an alternative against strains resistant to common antibiotics. However, the emergence of CFDC resistance in Klebsiella is a growing concern. Recent reports highlight increasing CFDC resistance in K. pneumoniae, particularly associated with mutations in the cirA gene, responsible for encoding a siderophore receptor. Co-localization of blaNDM-like gene and cirA mutations correlates with higher CFDC resistance. The study focuses on a carbapenem-resistant K. pneumoniae strain (Kp-1) with carbapenemases blaNDM-5 and blaOXA-181, recovered from a post-surgery patient. The strain exhibited resistance to all tested antibiotics but susceptibility to CFDC. Heteroresistant populations with the halo on inhibition of CFDC were observed. Genomic analysis identified a novel mutation (W123*) in the cirA gene associated with CFDC resistance. Additionally, increased blaNDM-5 expression in Kp-1 IHC (intra-halo colony) compared to Kp-1 was noted. The coexistence of blaNDM-like and cirA variants, along with high blaNDM-5 expression, explains the observed 21-fold increase in Minimum Inhibition Concentration (MIC) in Kp-1 IHC. The study contributes to understanding the molecular mechanisms driving the emergence of cefiderocol resistance, emphasizing the significance of coexisting mutations in cirA and blaNDM-like genes.</p>
Genomic Typing, Antimicrobial Resistance Gene, Virulence Factor and Plasmid Replicon Dataset for the Important Pathogenic Bacteria Klebsiella pneumoniae
<p>The infections caused by various bacterial pathogens both in clinical and community settings represent a significant threat to public healthcare worldwide. The growing resistance to antimicrobial drugs acquired by bacterial species causing healthcare-associated infections has already become a life-threatening danger noticed by the World Health Organization. Several groups or lineages of bacterial isolates usually called 'the clones of high risk' often drive the spread of resistance within particular species. </p> <p>Thus, it is vitally important to reveal and track the spread of such clones and the mechanisms by which they acquire antibiotic resistance and enhance their survival skills. Currently, the analysis of whole genome sequences for bacterial isolates of interest is increasingly used for these purposes, including epidemiological surveillance and developing of spread prevention measures. However, the availability and uniformity of the data derived from the genomic sequences often represents a bottleneck for such investigations. </p> <p>In this dataset, we present the results of a genomic epidemiology analysis of 61,857 genomes of a dangerous bacterial pathogen <em>Klebsiella pneumoniae</em> obtained from NCBI Genbank database. Important typing information including multilocus sequence typing (MLST)-based sequence types (STs), capsular (KL) and oligosaccharide (OL) types, CRISPR-Cas systems, and cgMLST profiles are presented, as well as the assignment of particular isolates to clonal groups (CG). The presence of antimicrobial resistance and virulence genes, as well as plasmid replicons, within the genomes is also reported. </p> <p>These data will be useful for researchers in the field of <em>K. pneumoniae</em> genomic epidemiology, resistance analysis and prevention measure development.</p>
Compressed Database of Klebsiella pneumoniae for WhatsGNU
<p>WhatsGNU_Kp_Ortholog.zip: <em>Klebsiella pneumoniae</em> Version-04/28/2020 (compressed 46,072,343 proteins in 8752 genomes to 1,466,934 protein variants). Updated File to fix issue with download.</p>
Data from : Genomic Sequence of Klebsiella pneumoniae IIEMP-3, a Vitamin B12-Producing Strain from Indonesian Tempeh
<p>Klebsiella pneumoniae strain IIEMP-3, isolated from Indonesian tempeh, is a vitamin B<sub>12</sub>-producing strain that exhibited a different genetic profile from pathogenic isolates. Here we report the draft genome sequence of strain IIEMP-3, which may provide insights on the nature of fermentation, nutrition, and immunological function of Indonesian tempeh.</p>
Short and Long Read Sequences from VIM-1 producing (Klebsiella pneumoniae test-dataset)
<p>Creation of a downsized version of the long and short reads data of VIM-1 producing <i>Klebsiella pneumoniae</i>. Samples were obtained from the Hospital Infanta Cristina (Badajoz, Spain) on October 11th, 2019. </p><p>- Long read data: Oxford Nanopore Technology (A1403KPN.fastq.gz).</p><p>- Short read data : Illumina (A1403KPN_R2_filtered.fastq.gz && A1403KPN_R2_filtered.fastq.gz)</p>
Emerging Resistance to Novel b-Lactam b-Lactamase Inhibitor Combinations in Klebsiella pneumoniae bearing KPC Variants
<p><em><span><span>Klebsiella pneumoniae</span></span></em><span><span> carbapenemase (KPC) variants, predominantly KPC-2 and KPC-3, are a significant global resistance mechanism in <em><span>K. pneumoniae</span></em>. KPC-2 and KPC-3 confer resistance to a broad range of β-lactams, including carbapenems, while remaining susceptible to ceftazidime-avibactam (CZA). Lately, new KPC variants have emerged and developed resistance to CZA, often through mutations, insertions, or deletions in key regions such as the Omega loop, the 237–243 loop, and the 266–275 loop. In the present work we aim to understand the role of these mutations in KPC in the emergence of cross-resistance to last-resort antibiotics like cefiderocol (FDC) and cefepime/zidebactam (FPZ). Fifteen clinical isolates of KPC-producing <em><span>Klebsiella</span></em> spp. were analyzed, representing 15 distinct KPC variants. CZA resistance was confirmed in 12 of the 15 KPC variants tested. Cross-resistance to FDC was observed in eight isolates, with five of these exhibiting spontaneous resistant subpopulations, including one originally categorized as FDC-susceptible. Six FDC-resistant strains carried mutations in the 266–275 loop. Cross-resistance to FPZ was observed in five KPC variants, particularly those with mutations in the 266–275 loop, although many omega loop and 237–243 loop mutants remained susceptible to FPZ. WGS of FDC-resistant subpopulations revealed additional mutations in genes such as <em><span>ompC</span></em>, <em><span>rpoC</span></em>, <em><span>dksA</span></em>, and <em><span>cirA</span></em>.<br>This study demonstrates that KPC variants show resistance to both CZA and FDC, with cross-resistance to FPZ observed to a lesser degree. The emergence of cross-resistance in strains that had not been exposed to these antibiotics raises concerns about the spread of resistance. The identification of mutations in <em><span>bla</span></em><sub>KPC</sub>, <em><span>cirA</span></em>, and other novel genes highlights the importance of understanding the molecular mechanisms driving resistance to develop effective therapeutic strategies. </span></span></p>
Raw Data for the article: A retrospective molecular epidemiological scenario of carbapenemase-producing Klebsiella pneumoniae clinical isolates in a Sicilian transplantation hospital shows a swift polyclonal divergence among sequence types, resistome and virulome
<p>In this work, we assessed and characterized the epidemiological scenario of carbapenem-resistant Klebsiella pneumoniae strains (CR-Kp) at IRCCS-ISMETT, a transplantation hospital in Palermo, Italy, from 2008 to 2017. A total of 288 K. pneumoniae clinical isolates were selected based on their resistance to carbapenems. Molecular characterization was also done in terms of the presence of virulence and resistance genes. All patients were inpatients from our facility and clinical isolates were collected from several sources, either from infection or colonization cases. We observed that, in agreement with the Italian epidemiological scenario, initially only ST258 and ST512 clade II (but not from clade I) were identified from 2008 to 2011. From 2012 onwards, other STs have been observed, including the clinically relevant ST101 and ST307, but also others not previously observed in other Italian health settings, such as ST220 and ST753. The presence of genes involved in resistance and virulence was confirmed, and a heterogeneous genetic resistance profile throughout the years was observed. Our work highlights that resistance genes are rapidly disseminating between different and novel K. pneumoniae clones which, combined with resistance to multiple antibiotics, can derive into more aggressive and pathogenic multidrug-resistant strains of clinical importance. Our results stress the importance of continuous surveillance of CR Enterobacterales in health facilities so that novel STs carrying resistance and virulence genes that may become increasingly pathogenic can be identified and adequate therapies to adopted to avoid their dissemination and derived pathologies.</p>
Raw Data for the article: Klebsiella pneumoniae Lipopolysaccharides Serotype O2afg Induce Poor Inflammatory Immune Responses Ex Vivo
<p>Currently, <em>Klebsiella pneumoniae</em> is a pathogen of clinical relevance due to its plastic ability of acquiring resistance genes to multiple antibiotics. During <em>K. pneumoniae</em> infections, lipopolysaccharides (LPS) play an ambiguous role as they both activate immune responses but can also play a role in immune evasion. The LPS O2a and LPS O2afg serotypes are prevalent in most multidrug resistant <em>K. pneumoniae</em> strains. Thus, we sought to understand if those two particular LPS serotypes were involved in a mechanism of immune evasion. We have extracted LPS (serotypes O1, O2a and O2afg) from <em>K. pneumoniae</em> strains and, using human monocytes ex vivo, we assessed the ability of those LPS antigens to induce the production of pro-inflammatory cytokines and chemokines. We observed that, when human monocytes are incubated with LPS serotypes O1, O2a or O2afg strains, O2afg and, to a lesser extent, O2a but not O1 failed to elicit the production of pro-inflammatory cytokines and chemokines, which suggests a role in immune evasion. Our preliminary data also shows that nuclear translocation of NF-κB, a process which regulates an immune response against infections, occurs in monocytes incubated with LPS O1 and, to a smaller extent, with LPS O2a, but not with the LPS serotype O2afg. Our results indicate that multidrug resistant <em>K. pneumoniae</em> expressing LPS O2afg serotypes avoid an initial inflammatory immune response and, consequently, are able to systematically spread inside the host unharmed, which results in the several pathologies associated with this bacterium.</p>
Direct prediction for carbapenemase-producing and colistin-resistant Klebsiella pneumoniae isolates from routine MALDI-TOF mass spectrum using machine learning
<p>The emergence of carbapenem-nonsusceptible K. pneumoniae (CnSKP) leads a serious threat to patient survival and colistin resistance makes the treatment of CnSKP more difficultly. To make treatment strategy properly and quickly, we aimed to develop a rapid prediction method for CnSKP and colistin-resistant K. pneumoniae (ColRKP) based on the spectra of routine matrix-assisted laser desorption/ionization-time-of-flight mass spectrometry (MALDI–TOF MS). The machine learning (ML) model for differentiating CnSKP and carbapenem-susceptible K. pneumoniae (CSKP) showed accuracy of 0.8869 and AUC of 0.9551; the model for ColRKP and colistin-intermediate K. pneumoniae (ColIKP) showed accuracy of 0.8361 and the AUC of 0.8447.</p>
Klebsiella pneumoniae Centrifuge DB
<p>Plascope DB for Klebsiella pneumoniae</p>
Klebsiella pneumonia in Sudan: Multidrug Resistance, Poly-clonal Dissemination and Virulence
<p>Minimum spanning tree (MST) of 84 <em>K. pneumoniae</em> by hospital information. Ridom SeqSphere+ MST for 84 samples based on 2358 columns, pairwise ignoring missing values, logarithmic scale. Cluster distance threshold: 15. Isolates grouped by colour indicating the different hospitals . Samples were collected from five different hospitals, 37 different STs were identified, in addition to 14 transmission clusters, represented by shaded nodes and arrows. Numbers between the nodes indicate the number of allelic differences.</p>
Genome assemblies: Horizontal transfer of pOXA-48 from a hypervirulent Klebsiella pneumoniae ST23/KL57 to Serratia marcescens
<p>Hypervirulent Klebsiella pneumonia isolates express a range of virulence factors, often encoded on virulence plasmids. Occasionally these hypervirulent lineages acquire antimicrobial resistance genes rendering them multidrug-resistant. We describe the nosocomial transmission of a hypervirulent K. pneumoniae ST23/KL57 isolate carrying an NDM-1 and OXA-48 beta-lactamase among COVID-19 patients in a Danish university hospital. Furthermore, we characterize the plasmid structure and describe a within-patient horizontal transfer of a plasmid carrying a blaOXA-48 gene from K. pneumoniae ST23/KL57 to a Serratia marcescens isolate.</p>
The impact of antibiotic induction on virulence and antibiotic resistance in Klebsiella pneumoniae
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Polyphasic characterization of carbapenem-resistant Klebsiella pneumoniae clinical isolates suggests vertical transmission of the blaKPC-3 gene
<p>Optical DNA mapping (ODM) data related to the study, presented in figures 2-6 in the paper.</p>
Computer-Aided Drug Design (CADD): To Screen Potential Antibiotics Against Klebsiella Pneumoniae Beta-Lactamase Enzyme
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Identification and prioritization of novel therapeutic candidates against Glutamate racemase from Klebsiella pneumoniae
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IMPACT OF TEBIPENEM-PIVOXIL ON THE INTESTINAL MICROBIOTA AND ON ESTABLISHMENT OF COLONIZATION WITH CARBAPENEM-RESISTANT KLEBSIELLA PNEUMONIAE IN MICE
<p><span>Antimicrobial therapy has the</span><span> potential to cause unintended adverse effects by promoting antibiotic-resistant bacteria. Therefore, as new antibiotics are developed there is a need to understand their potential to disrupt the indigenous microbiota of the colon and promote colonization by pathogens. Tebipenem pivoxil (Teb-piv), the first oral carbapenem, has potent <em>in vitro</em> activity against <em>Enterobacterales</em> pathogens, but requires combination with an appropriate β-lactamase inhibitor to achieve activity against <em>Klebsiella pneumoniae</em> carbapenemase and metallo-β-lactamase (MBL)-producing carbapenem-resistant <em>Enterobacterales</em></span></p>
Data from: Clinical outcomes and safety of polymyxin B versus tigecycline combination therapy for pneumonia of carbapenem-resistant Klebsiella pneumoniae: A retrospective cohort study
<p><strong>Purpose:</strong> Infection by carbapenem-resistant <em>Klebsiella pneumoniae</em> (CRKP) has high mortality. There is no clear optimal therapeutic choice for pneumonia caused by CRKP. The aim of this study was to compare the clinical outcomes and safety of the standard doses of polymyxin B-based regimens vs tigecycline-based regimens and to identify risk factors for mortality.</p> <p><strong>Methods:</strong><strong> </strong>This retrospective cohort study included patients with pneumonia caused by CRKP for three years. The primary outcomes were 7-day bacterial eradication rate and 14- and 28-day all-cause mortality. The secondary outcome was incidence of acute kidney injury.</p> <p><strong>Results:</strong><strong> </strong>Seventy-three patients were included in this study, 29 in the<strong> </strong>polymyxin B-based combination therapy group and 44 in tigecycline-based combination therapy group. There were no significant differences between the two groups in terms of the 7-day bacterial eradication rate (31.0% vs 20.5%, <em>P</em>=0.409), the 14-day all-cause mortality (37.9% vs 22.7%, <em>P</em>=0.160), and the incidence of acute kidney injury (14.3% vs 6.8%, <em>P</em>=0.526). The 28-day all-cause mortality in the polymyxin B-based therapy group was higher than in the tigecycline-based group (75.9% vs 45.5%, <em>P</em>=0.010). Binary logistic regression analysis revealed that male and previous use of carbapenems were independent factors associated with 28-day all-cause mortality for patients treated with polymyxin B (<em>P</em><0.05).</p> <p><strong>Conclusions:</strong><strong> </strong>Polymyxin B-based combination therapy at the standard dose should be used with caution for patients with CRKP-induced pneumonia, especially for men who used carbapenems prior to CRKP detection.</p>
Live and dead cells in strong and weak biofilms of Klebsiella pneumoniae
<p>Video of CLSM Z-stack of strong and weak biofilm showing the arrangement of live and dead cells inside the biofilm matrix. </p>
Figure 12: Theoretical Prediction of Imipenem Resistance in Klebsiella Pneumoniae (2020-2030)
<p><strong>Figure 12: Theoretical Prediction of Imipenem Resistance in Klebsiella Pneumoniae (2020-2030)</strong></p>
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