Strain phylogroup and environmental constraints shape Escherichia coli dynamics and diversity over a 20-year human gut time series.

Escherichia coli is an increasingly antibiotic-resistant opportunistic pathogen. Few data are available on its ecological and evolutionary dynamics in its primary commensal niche, the vertebrate gut. Using Illumina and/or Nanopore technologies, we sequenced whole genomes of 210 E.

An antiplasmid system drives antibiotic resistance gene integration in carbapenemase-producing Escherichia coli lineages.

Plasmids carrying antibiotic resistance genes (ARG) are the main mechanism of resistance dissemination in Enterobacterales. However, the fitness-resistance trade-off may result in their elimination. Chromosomal integration of ARGs preserves resistance advantage while relieving the selective pressure for keeping costly plasmids.

Residual risk of Pseudomonas aeruginosa waterborne contamination in an intensive care unit despite the presence of filters at all water points-of-use.

Objective: To assess the residual risk of waterborne contamination by Pseudomonas aeruginosa from a water network colonized by a single genotype [sequence type (ST) 299] despite the presence of antimicrobial filters in a medical intensive care unit (ICU).

Methods: During the first 19-month period since the ICU opened, contamination of the water network was assessed monthly by collecting water upstream of the filters. Downstream water was also sampled to assess the efficiency of the filters.

Clinical and Bacteriological Specificities of Escherichia coli Bloodstream Infections From Biliary Portal of Entries.

Background: Escherichia coli is frequently responsible for bloodstream infections (BSIs). Among digestive BSIs, biliary infections appear to be less severe. Respective roles of host factors, bacterial determinants (phylogroups, virulence, and antibiotic resistance), and portal of entry on outcome are unknown.