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Tuesday, April 21, 2020

Transmission of ESBL-producing Escherichia coli between broilers and humans on broiler farms.

ESBL and AmpC ß-lactamases are an increasing concern for public health. Studies suggest that ESBL/pAmpC-producing Escherichia coli and their plasmids carrying antibiotic resistance genes can spread from broilers to humans working or living on broiler farms. These studies used traditional typing methods, which may not have provided sufficient resolution to reliably assess the relatedness of these isolates.Eleven suspected transmission events among broilers and humans living/working on eight broiler farms were investigated using whole-genome short-read (Illumina) and long-read sequencing (PacBio). Core genome MLST (cgMLST) was performed to investigate the occurrence of strain transmission. Horizontal plasmid and gene transfer were analysed using…

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Sunday, September 22, 2019

Comparison of highly and weakly virulent Dickeya solani strains, with a view on the pangenome and panregulon of this species.

Bacteria belonging to the genera Dickeya and Pectobacterium are responsible for significant economic losses in a wide variety of crops and ornamentals. During last years, increasing losses in potato production have been attributed to the appearance of Dickeya solani. The D. solani strains investigated so far share genetic homogeneity, although different virulence levels were observed among strains of various origins. The purpose of this study was to investigate the genetic traits possibly related to the diverse virulence levels by means of comparative genomics. First, we developed a new genome assembly pipeline which allowed us to complete the D. solani genomes.…

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Sunday, September 22, 2019

Production of glycine-derived ammonia as a low-cost and long-distance antibiotic strategy by Streptomyces

Soil-inhabiting streptomycetes are Natures medicine makers, producing over half of all known antibiotics and many other bioactive natural products. However, these bacteria also produce many volatile compounds, and research into these molecules and their role in soil ecology is rapidly gaining momentum. Here we show that streptomycetes have the ability to kill bacteria over long distances via air-borne antibiosis. Our research shows that streptomycetes do so by producing surprisingly high amounts of the low-cost volatile antimicrobial ammonia, which travels over long distances and antagonises both Gram-positive and Gram-negative bacteria. Glycine is required as precursor to produce ammonia, and inactivation of…

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Sunday, September 22, 2019

Stress-induced formation of cell wall-deficient cells in filamentous actinomycetes.

The cell wall is a shape-defining structure that envelopes almost all bacteria and protects them from environmental stresses. Bacteria can be forced to grow without a cell wall under certain conditions that interfere with cell wall synthesis, but the relevance of these wall-less cells (known as L-forms) is unclear. Here, we show that several species of filamentous actinomycetes have a natural ability to generate wall-deficient cells in response to hyperosmotic stress, which we call S-cells. This wall-deficient state is transient, as S-cells are able to switch to the normal mycelial mode of growth. However, prolonged exposure of S-cells to hyperosmotic…

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