Blar i forfatter Det helsevitenskapelige fakultet "Hjerde, Erik"

Viser treff 1-13 av 13

    • Comparative Genomic Analysis of Staphylococcus haemolyticus Reveals Key to Hospital Adaptation and Pathogenicity 

      Pain, Maria Charlene Ronessen; Hjerde, Erik; Klingenberg, Claus; Cavanagh, Jorunn Pauline (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-09-10)
      <i>Staphylococcus haemolyticus</i> is a skin commensal gaining increased attention as an emerging pathogen of nosocomial infections. However, knowledge about the transition from a commensal to an invasive lifestyle remains sparse and there is a paucity of studies comparing pathogenicity traits between commensal and clinical isolates. In this study, we used a pan-genomic approach to identify factors ...

    • Composition of gut microbiota of children and adolescents with perinatal HIV infection taking antiretroviral therapy in Zimbabwe 

      Flygel, Trym Thune; Sovershaeva, Evgeniya; Classen-Weitz, Shantelle; Hjerde, Erik; Mwaikono, Kilaza S.; Odland, Jon Øyvind; Ferrand, Rashida A.; McHugh, Grace; Gutteberg, Tore Jarl; Nicol, Mark P.; Cavanagh, Jorunn Pauline; Flægstad, Trond (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-09-24)
      <p><i>Background - </i>Human immunodeficiency virus (HIV) infection causes impairment of the gastrointestinal barrier, with substantial depletion of CD4<sup>+</sup> T cells in the gut. Antiretroviral therapy (ART) restores CD4<sup>+</sup> counts and may have beneficial effects on gut microbiota in adults. Little is known about effect of long-term ART on gut microbiome in HIV-infected children. We ...

    • Construction of a fur null mutant and RNA-sequencing provide deeper global understanding of the Aliivibrio salmonicida Fur regulon 

      Thode, Sunniva Katharina; Bækkedal, Cecilie; Söderberg, Jenny Johansson; Hjerde, Erik; Hansen, Hilde; Haugen, Peik (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-07-13)
      <i>Background:</i> The ferric uptake regulator (Fur) is a transcription factor and the main regulator of iron acquisition in prokaryotes. When bound to ferric iron, Fur recognizes its DNA binding site and generally executes its function by repressing transcription of its target genes. Due to its importance in virulence, the Fur regulon is well studied for several model bacteria. In our previous ...

    • Detection of Klebsiella pneumoniae human gut carriage: a comparison of culture, qPCR, and whole metagenomic sequencing methods 

      Lindstedt, Kenneth; Buczek, Dorota Julia; Pedersen, Torunn Annie; Hjerde, Erik; Raffelsberger, Niclas Peter; Suzuki, Yutaka; Brisse, Sylvain; Holt, Kathryn E.; Samuelsen, Ørjan; Sundsfjord, Arnfinn (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-08-31)
      Klebsiella pneumoniae is an important opportunistic healthcare-associated pathogen and major contributor to the global spread of antimicrobial resistance. Gastrointestinal colonization with K. pneumoniae is a major predisposing risk factor for infection and forms an important hub for the dispersal of resistance. Current culture-based detection methods are time consuming, give limited intra-sample ...

    • Development of early life gut resistome and mobilome across gestational ages and microbiota-modifying treatments 

      Bargheet, Ahmed; Klingenberg, Claus Andreas; Esaiassen, Eirin; Hjerde, Erik; Cavanagh, Jorunn Pauline; Bengtsson-Palme, Johan; Pettersen, Veronika K. (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-13)
      Background - Gestational age (GA) and associated level of gastrointestinal tract maturation are major factors driving the initial gut microbiota composition in preterm infants. Besides, compared to term infants, premature infants often receive antibiotics to treat infections and probiotics to restore optimal gut microbiota. How GA, antibiotics, and probiotics modulate the microbiota’s core ...

    • Effects of Probiotic Supplementation on the Gut Microbiota and Antibiotic Resistome Development in Preterm Infants 

      Esaiassen, Eirin; Hjerde, Erik; Cavanagh, Jorunn Pauline; Pedersen, Tanja; Andresen, Jannicke Hanne; Rettedal, Siren; Støen, Ragnhild; Nakstad, Britt; Willassen, Nils Peder; Klingenberg, Claus (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-11-16)
      <i>Objectives</i>: In 2014 probiotic supplementation (<i>Lactobacillus acidophilus and Bifidobacterium longum subspecies infantis;</i> Infloran®) was introduced as standard of care to prevent necrotizing enterocolitis (NEC) in extremely preterm infants in Norway. We aimed to evaluate the influence of probiotics and antibiotic therapy on the developing gut microbiota and antibiotic resistome in ...

    • The genome sequence of the fish pathogen Aliivibrio salmonicida strain LFI1238 shows extensive evidence of gene decay 

      Hjerde, Erik; Holden, Matthew TG; Seeger, Kathy; Lorentzen, Marit Sjo; Bason, Nathalie; Paulsen, Steinar; Willassen, Nils Peder; Churcher, Carol; Harris, David; Norbertczak, Halina; Quail, Michael A; Sanders, Suzanne; Thurston, Scott; Parkhill, Julian; Thomson, Nicholas R (Journal article; Tidsskriftartikkel; Peer reviewed, 2008-12-19)
      <b>Background:</b> The fish pathogen Aliivibrio salmonicida is the causative agent of cold-water vibriosis in marine aquaculture. The Gram-negative bacterium causes tissue degradation, hemolysis and sepsis in vivo.<BR><BR> <b>Results:</b> In total, 4 286 protein coding sequences were identified, and the 4.6 Mb genome of A. salmonicida has a six partite architecture with two chromosomes and four ...

    • ICESluvan, a 94-Kilobase Mosaic Integrative Conjugative Element Conferring Interspecies Transfer of VanB-Type Glycopeptide Resistance, a Novel Bacitracin Resistance Locus, and a Toxin- Antitoxin Stabilization System 

      Bjørkeng, Eva katrin; Hjerde, Erik; Pedersen, Torunn; Sundsfjord, Arnfinn; Hegstad, Kristin (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      A 94-kb integrative conjugative element (ICESluvan) transferable to Enterococcus faecium and Enterococcus faecalis from an animal isolate of Streptococcus lutetiensis consists of a mosaic of genetic fragments from different Gram-positive bacteria. A variant of ICESluvan was confirmed in S. lutetiensis from a patient. A complete Tn5382/Tn1549 with a vanB2 operon is integrated into a streptococcal ...

    • Prevalence, diversity and transferability of the Tn916-Tn1545 family ICE in oral streptococci 

      lunde, tracy; Hjerde, Erik; Al-Haroni, Mohammed (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-03-15)
      <i>Background</i>: The Tn<i>916</i>-Tn<i>1545</i> family of Integrative Conjugative Elements (ICE) are mobile genetic elements (MGEs) that play a role in the spread of antibiotic resistance genes. The Tn<i>916</i> harbors the tetracycline resistance gene <i>tet</i>(M) and it has been reported in various bacterial species. The increase in the levels of tetracycline resistance among oral streptococci ...

    • Prevalence, diversity and transferability of the Tn916-Tn1545 family ICE in oral streptococci 

      Lunde, Tracy Munthali; Hjerde, Erik; Al-Haroni, Mohammed (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-03-15)
      <i>Background</i>: The Tn<i>916</i>-Tn<i>1545</i> family of Integrative Conjugative Elements (ICE) are mobile genetic elements (MGEs) that play a role in the spread of antibiotic resistance genes. The Tn<i>916</i> harbors the tetracycline resistance gene <i>tet</i>(M) and it has been reported in various bacterial species. The increase in the levels of tetracycline resistance among oral streptococci ...

    • Shotgun-metagenomics based prediction of antibiotic resistance and virulence determinants in Staphylococcus aureus from periprosthetic tissue on blood culture bottles 

      Sanabria-Moreno, Adriana Maria; James Peter, Jessin Janice; Hjerde, Erik; Simonsen, Gunnar Skov; Hanssen, Anne Merethe (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-10-21)
      Shotgun-metagenomics may give valuable clinical information beyond the detection of potential pathogen(s). Identification of antimicrobial resistance (AMR), virulence genes and typing directly from clinical samples has been limited due to challenges arising from incomplete genome coverage. We assessed the performance of shotgun-metagenomics on positive blood culture bottles (n = 19) with periprosthetic ...

    • Shotgun-Metagenomics on Positive Blood Culture Bottles Inoculated With Prosthetic Joint Tissue: A Proof of Concept Study 

      Sanabria-Moreno, Adriana Maria; Hjerde, Erik; Johannessen, Mona; Sollid, Johanna U Ericson; Simonsen, Gunnar Skov; Hanssen, Anne Merethe (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-07-17)
      Clinical metagenomics is actively moving from research to clinical laboratories. It has the potential to change the microbial diagnosis of infectious diseases, especially when detection and identification of pathogens can be challenging, such as in prosthetic joint infection (PJI). The application of metagenomic sequencing to periprosthetic joint tissue (PJT) specimens is often challenged by low ...

    • Whole-genome sequencing reveals clonal expansion of multiresistant Staphylococcus heamolyticus in European hopsitals 

      Cavanagh, Jorunn Pauline; Hjerde, Erik; Holden, Matthew T.G.; Kahlke, Tim; Klingenberg, Claus; Flægstad, Trond; Parkhill, J; Bentley, Stephen D; Sollid, Johanna U Ericson (Journal article; Tidsskriftartikkel; Peer reviewed, 2014)