Ontology highlight
ABSTRACT:
PROVIDER: PRJNA1062789 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:A collection of 61 Salmonella enterica serovar Typhimurium (S. Typhimurium) of animal and human origin, matched as closely as possible by phage type, antimicrobial resistance pattern and place / time of isolation, and sourced from farms or hospitals in Scotland, were analysed by antimicrobial susceptibility testing, phage typing, pulsed field gel electrophoresis (PFGE), plasmid profiling and DNA microarrays. PFGE of all 61 isolates revealed ten PFGE profiles, which clustered by phage type and antibiotic resistance pattern, with human and animal isolates distributed between PFGE profiles. Analysis of 23 representative S. Typhimurium strains hybridised to a composite Salmonella DNA microarray identified a small number of specific regions of genome variation between different phage types and PFGE profiles. These variable regions of DNA were typically located within prophage-like elements. Simple PCR assays were subsequently designed to discriminate between different isolates from the same geographical region.
2007-06-09 | E-SGRP-6 | biostudies-arrayexpress
Project description:Salmonella Heidelberg is currently the 9th common serovar and has more than twice the average incidence of blood infections in Salmonella. A recent Salmonella Heidelberg outbreak in chicken infected 634 people during 2013-2014, with a hospitalization rate of 38% and an invasive illness rate of 15%. While the company’s history suggested longstanding sanitation issues, the strains’ characteristics which may have contributed to the outbreak are unknown. We hypothesized that the outbreak strains of S. Heidelberg might possess enhanced stress tolerance or virulence capabilities. Consequently, we obtained nine food isolates collected during the outbreak investigation and several reference isolates and tested their tolerance to processing stresses, their ability to form biofilms, and their invasiveness in vitro. We further performed RNA-sequencing on three isolates with varying heat tolerance to determine the mechanism behind our isolates’ enhanced heat tolerance. Ultimately, we determined that (i) many Salmonella Heidelberg isolates associated with a foodborne outbreak have enhanced heat resistance (ii) Salmonella Heidelberg outbreak isolates have enhanced biofilm-forming ability under stressful conditions, compared to the reference strain (iii) exposure to heat stress may also increase Salmonella Heidelberg isolates’ antibiotic resistance and virulence capabilities and (iv) Salmonella Heidelberg outbreak-associated isolates are primed to better survive stress and cause illness. This data helps explain the severity and scope of the outbreak these isolates are associated with and can be used to inform regulatory decisions on Salmonella in poultry and to develop assays to screen isolates for stress tolerance and likelihood of causing severe illness.
2018-09-01 | GSE103418 | GEO
Project description:Escherichia coli isolates recovered from retail chicken and from chicken fecal samples Genome sequencing and assembly
| PRJNA494909 | ENA
Project description:Poultry products are an important source of Salmonella enterica. An effective way to reduce food poisoning due to Salmonella would be to breed chickens more resistant to Salmonella. Unfortunately resistance to Salmonella is a complex trait with many factors involved. To learn more about Salmonella resistance mechanisms in young chickens, a cDNA microarray analysis was performed to compare gene expression profiles between a Salmonella susceptible and a more resistant chicken line. Newly hatched chickens were orally infected with S. enterica serovar Enteritidis. Since the intestine is the first barrier the bacteria encountersbacteria encounter after oral inoculation, gene expression was investigated in the intestine, from day 1 until day 21 post infection. Differences in gene expression between the susceptible and resistant chicken line were found in control as well as Salmonella infected conditions. In response to the Salmonella infection, the expression of different sets of genes seemed to be affected in the jejunum of the two chicken lines. In the susceptible line this included genes that affect T-cell activation, whereas in the more resistant line, at day 1, macrophage activation seemed to be more affected. At day 7 and 9 most gene expression differences between the two chicken lines were identified under control conditions, indicating a difference in the intestinal development between the two chicken lines which might be linked to the difference in Salmonella susceptibility. The findings in this study have lead to the identification of novel genes and possible cellular pathways of the host involved in Salmonella susceptibility. Keywords: timecourse, disease
2005-12-05 | GSE3066 | GEO
Project description:Antimicrobial Resistance and Genomic Features Characterization of Salmonella Isolates from Chicken Meat in Saudi Arabia
| PRJNA872154 | ENA
Project description:This study identified and compared the bacterial diversity and the antimicrobial resistance profile of clinically relevant isolates around a newly developed hospital and university precinct
2024-02-27 | GSE225419 | GEO
Project description:Salmonella enterica variants exhibit diverse host adaptation, outcome of infection, and associated risk to humans. Analysis of 6,335 Salmonella isolates recovered from integrated human-animal surveillance in Emilia Romagna region, Northern Italy, (human population ca 4,500,000), from 2012 to 2017 showed that Salmonella enterica serovar Derby constitutes a swine associated serovar in this epidemiological context while representing also a significant causative agent of human infections. Comparison of the distribution of subtypes of Salmonella Derby from human and swine identified isolates with a distinct PFGE profile that were significantly less isolated in human infections than in swine infections compared to all other subtypes. Here we show that isolates with this PFGE profile form a distinct phylogenetic sub-clade within Salmonella Derby and exhibit a marked reduction in invasion and replication in human epithelial cells but a relatively small reduction in swine epithelial cells, in line with the epidemiological evidence. A single missense mutation in hilD, that encodes the master-regulator of the Salmonella Pathogenicity Island 1 (SPI-1), was identified in this lineage of Salmonella Derby. Since SPI-1 encodes for a primary system of Salmonella invasion into epithelial cells, we investigated the role of the observed mutation in detail. We demonstrated that the missense mutation results in a loss of function of HilD that accounts for the reduced invasion and replication in human epithelial cells while showing a relatively small impact on the interaction with swine cells. This finding is suggestive of a mechanism of invasion alternative to SPI-1 in the Salmonella-swine combination
2020-12-16 | GSE142220 | GEO
Project description:Screen for differences in gene expression between a parental Salmonella enterica serovar Enteritidis strain (ATCC4931) and an adapted strain with increased resistance to the widely used antimicrobial sanitizer dodecyltrimethylammonium chloride (DTAC)
2012-12-31 | GSE41606 | GEO