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Sunday, July 7, 2019

Horizontal transfer of carbapenemase-encoding plasmids and comparison with hospital epidemiology data.

Carbapenemase-producing organisms have spread worldwide, and infections with these bacteria cause significant morbidity. Horizontal transfer of plasmids that encode carbapenemases plays an important role in the spread of multidrug resistant Gram-negative bacteria. Here we investigate parameters regulating conjugation using an E. coli laboratory strain that lacks plasmids or restriction-enzyme modification systems as a recipient and also using patient isolates as donors and recipients. Because conjugation is tightly regulated, we performed a systematic analysis of the transfer of Klebsiella pneumoniae carbapenemase (blaKPC)-encoding plasmids into multiple strains under different environmental conditions to investigate critical variables. We used four blaKPC-plasmids isolated from patient…

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Sunday, July 7, 2019

Comparative genomic analysis of Klebsiella pneumoniae subsp. pneumoniae KP617 and PittNDM01, NUHL24835, and ATCC BAA-2146 reveals unique evolutionary history of this strain.

Klebsiella pneumoniae subsp. pneumoniae KP617 is a pathogenic strain that coproduces OXA-232 and NDM-1 carbapenemases. We sequenced the genome of KP617, which was isolated from the wound of a Korean burn patient, and performed a comparative genomic analysis with three additional strains: PittNDM01, NUHL24835 and ATCC BAA-2146.The complete genome of KP617 was obtained via multi-platform whole-genome sequencing. Phylogenetic analysis along with whole genome and multi-locus sequence typing of genes of the Klebsiella pneumoniae species showed that KP617 belongs to the WGLW2 group, which includes PittNDM01 and NUHL24835. Comparison of annotated genes showed that KP617 shares 98.3 % of its genes with…

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Sunday, July 7, 2019

The complete genome of Dietzia timorensis ID05-A0528(T) revealed the genetic basis for its saline-alkali tolerance.

The type strain Dietzia timorensis ID05-A0528(T), was reported to be able to survive in the highly saline and alkaline environments with diverse carbon sources. In order to more pertinently understand the genetic mechanisms of its environmental tolerance and crude oil emulsification, we reported the complete genome sequence of the strain in the study. The genome contains only one circular chromosome, with the total size of 3,607,892 bps, and the G+C content of this strain is 65.58%, much lower than other type strains of this genus. It was found that strain ID05-A0528(T) contains genes involved in transportation and biosynthesis of compatible…

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Sunday, July 7, 2019

Multiplication of blaOXA-23 is common in clinical Acinetobacter baumannii, but does not enhance carbapenem resistance.

To investigate the copy number of blaOXA-23 and its correlation with carbapenem resistance in carbapenem-resistant Acinetobacter baumannii (CRAB).A total of 113 blaOXA-23-positive clinical CRAB isolates were collected from two hospitals in Zhejiang province, China. Their genetic relatedness was determined by MLST. The MIC of imipenem was determined using the agar diffusion method and the copy number of blaOXA-23 was measured using quantitative real-time PCR (qRT-PCR). The complete genomes of five clinical CRAB strains were sequenced using PacBio technology to investigate the multiplication mechanism of blaOXA-23.Most of the isolates (100/113) belonged to global clone II and the MIC of imipenem ranged…

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Sunday, July 7, 2019

Genomic analyses of multidrug resistant Pseudomonas aeruginosa PA1 resequenced by single-molecule real-time sequencing.

As a third-generation sequencing (TGS) method, single-molecule real-time (SMRT) technology provides long read length, and it is well suited for resequencing projects and de novo assembly. In the present study, Pseudomonas aeruginosa PA1 was characterized and resequenced using SMRT technology. PA1 was also subjected to genomic, comparative and pan-genomic analyses. The multidrug resistant strain PA1 possesses a 6,498,072 bp genome and a sequence type of ST-782. The genome of PA1 was also visualized, and the results revealed the details of general genome annotations, virulence factors, regulatory proteins (RPs), secretion system proteins, type II toxin-antitoxin (T-A) pairs and genomic islands. Whole genome comparison analysis…

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Sunday, July 7, 2019

Pathogenesis of multi drug-resistant and extensively drug-resistant tuberculosis as a determinant of future treatment success.

Multidrug-resistant (MDR)/extensively drug-resistant (XDR) tuberculosis (TB) is a significant threat to global TB control [1]. In most cases, treatment of MDR/XDR TB is not standardized, and clinicians have adopted a variety of treatment strategies. These strategies include switching to a regimen of new drugs, increasing the dosage of the same drugs, rarely used drugs (which have widespread resistance), etc. Drug resistance is a manmade phenomenon that is driven by treatment strategy (i.e., regimen). These divergent approaches may differentially drive the evolution of bacteria. Some instances of this evolution have already occurred [2]. The community’s focus has been on drug resistance;…

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Sunday, July 7, 2019

Evolution and comparative genomics of F33:A-:B- plasmids carrying blaCTX-M-55 or blaCTX-M-65 in Escherichia coli and Klebsiella pneumoniae isolated from animals.

To understand the underlying evolution process of F33:A-:B- plasmids among Enterobacteriaceae isolates of various origins in China, the complete sequences of 17 blaCTX-M-harboring F33:A-:B- plasmids obtained from Escherichia coli and Klebsiella pneumoniae isolates from different sources (animals, animal-derived food, and human clinics) in China were determined. F33:A-:B- plasmids shared similar plasmid backbones comprising replication, leading, and conjugative transfer regions and differed by the numbers of repeats in yddA and traD and by the presence of group II intron, except that pHNAH9 lacked a large segment of the leading and transfer regions. The variable regions of F33:A-B- plasmids were distinct and…

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Sunday, July 7, 2019

Complete and assembled genome sequence of an NDM-5- and CTX-M-15-producing Escherichia coli sequence type 617 isolated from wastewater in Switzerland.

Carbapenem-resistant Escherichia coli have emerged worldwide and represent a major challenge to effective healthcare management. Here we report the genome sequence of an NDM-5- and CTX-M-15-producing E. coli belonging to sequence type 617 isolated from wastewater treatment plant effluent in Switzerland.Whole-genome sequencing of E. coli 657SK2 was performed using Pacific Biosciences (PacBio) single-molecule real-time (SMRT) technology RS2 reads (C4/P6 chemistry). De novo assembly was carried out using Canu 1.6, and sequences were annotated using the NCBI Prokaryotic Genome Annotation Pipeline (PGAP).The genome of E. coli 657SK2 consists of a 4.9-Mbp chromosome containing blaCTX-M-15, genes associated with virulence [fyuA, hlyE, the…

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Sunday, July 7, 2019

Complete genome sequence of the multidrug-resistant neonatal meningitis Escherichia coli serotype O75:H5:K1 strain mcjchv-1 (NMEC-O75).

Neonatal meningitis Escherichia coli (NMEC) is the second leading cause of neonatal bacterial meningitis worldwide. We report the genome sequence of the multidrug-resistant NMEC serotype O75:H5:K1 strain mcjchv-1, which resulted in an infant’s death. The O75 serogroup is rare among NMEC isolates; therefore, this strain is considered an emergent pathogen.

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