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Author Claudia Guldimann

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Global Transcriptional Response of Three Highly Acid-Tolerant Field Strains of Listeria monocytogenes to HCl Stress.

Jule Anna Horlbog, Marc J A Stevens, Roger Stephan, Claudia Guldimann,

Tolerance to acid is of dual importance for the food-borne pathogen Listeria monocytogenes: acids are used as a preservative, and gastric acid is one of the first defenses within the host. There are considerable differences in the acid tolerance of strains. Here we present the transcriptomic response of acid-tolerant field ... Read more >>

Microorganisms (Microorganisms)
[2019, 7(10):]

Cited: 0 times

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Growth potential of Listeria monocytogenes in twelve different types of RTE salads: Impact of food matrix, storage temperature and storage time.

Matthias Ziegler, David Kent, Roger Stephan, Claudia Guldimann,

Listeriosis is a food borne disease associated with high hospitalization and fatality rates; in 2014, EU member states reported 2194 cases with 98.9% hospitalization rates and 210 fatalities. Proper risk analysis and the development of effective food safety strategies critically depend on the knowledge of the growth characteristics of L. ... Read more >>

Int. J. Food Microbiol. (International journal of food microbiology)
[2019, 296:83-92]

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Identification of Novel Mobilized Colistin Resistance Gene mcr-9 in a Multidrug-Resistant, Colistin-Susceptible Salmonella enterica Serotype Typhimurium Isolate.

Laura M Carroll, Ahmed Gaballa, Claudia Guldimann, Genevieve Sullivan, Lory O Henderson, Martin Wiedmann,

Mobilized colistin resistance (mcr) genes are plasmid-borne genes that confer resistance to colistin, an antibiotic used to treat severe bacterial infections. To date, eight known mcr homologues have been described (mcr-1 to -8). Here, we describe mcr-9, a novel mcr homologue detected during routine in silico screening of sequenced Salmonella ... Read more >>

mBio (mBio)
[2019, 10(3):]

Cited: 18 times

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Identification of novel mobilized colistin resistance gene mcr-9 in a multidrug-resistant, colistin-susceptible Salmonella enterica serotype Typhimurium isolate using a combination of high-throughput, in silico screening and functional analysis

Laura Carroll, Ahmed Gaballa, Claudia Guldimann, Genevieve Sullivan, Lory Henderson, Martin Wiedmann,

Mobilized colistin resistance ( mcr ) genes are plasmid-borne genes that confer resistance to colistin, an antibiotic used to treat severe bacterial infections. To date, eight known mcr homologues have been described ( mcr -1 to -8). Here, we describe mcr -9, a novel mcr homologue, detected in a Salmonella ... Read more >>

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Characteristics of Listeria Monocytogenes Strains Persisting in a Meat Processing Facility over a 4-Year Period.

Andrea Stoller, Marc J A Stevens, Roger Stephan, Claudia Guldimann,

Listeria monocytogenes can persist in food production facilities, resulting in serious threats to consumers due to the high mortality associated with listeriosis, especially in the very young, old and pregnant. We subtyped 124 strains of L. monocytogenes isolated from a meat processing facility in Switzerland by serotyping, multi locus sequence ... Read more >>

Pathogens (Pathogens (Basel, Switzerland))
[2019, 8(1):]

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Whole-Genome Sequences of Six Listeria monocytogenes Strains Isolated from Food.

Jule Anna Horlbog, Hyein Jang, Gopal Gopinath, Roger Stephan, Claudia Guldimann,

Here, we report the whole-genome sequences of six Listeria monocytogenes strains isolated from meat and milk products in Switzerland. All of these strains carry premature stop codons or amino acid deletions in inlA. ... Read more >>

Microbiol Resour Announc (Microbiology resource announcements)
[2018, 7(14):]

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Growth potential of Listeria monocytogenes in six different RTE fruit products: impact of food matrix, storage temperature and shelf life.

Matthias Ziegler, Simon Rüegg, Roger Stephan, Claudia Guldimann,

We tested the growth potential of Listeria monocytogenes on six RTE fruit products at low (4°C at the factory followed by 8°C retail/home storage) and abusive (4°C followed by 12°C) storage temperatures. Sliced coconut and fresh cut cantaloupe, as well as a fruit mix containing diced pineapple, cantaloupe, apples and ... Read more >>

Ital J Food Saf (Italian journal of food safety)
[2018, 7(3):7581]

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Surviving host - and food relevant stresses: phenotype of L. monocytogenes strains isolated from food and clinical sources.

Jule Anna Horlbog, David Kent, Roger Stephan, Claudia Guldimann,

The aim of this study was to compare the phenotype of 40 strains of L. monocytogenes under food and host relevant stress conditions. The strains were chosen to represent food and clinical isolates and to be equally distributed between the most relevant clonal complexes for clinical and food isolates (CC1 ... Read more >>

Sci Rep (Scientific reports)
[2018, 8(1):12931]

Cited: 4 times

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First report of an mcr-1-harboring Salmonella enterica subsp. enterica serotype 4,5,12:i:- strain isolated from blood of a patient in Switzerland.

Laura M Carroll, Katrin Zurfluh, Hyein Jang, Gopal Gopinath, Magdalena Nüesch-Inderbinen, Laurent Poirel, Patrice Nordmann, Roger Stephan, Claudia Guldimann,

Int. J. Antimicrob. Agents (International journal of antimicrobial agents)
[2018, 52(5):740-741]

Cited: 1 time

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Whole-Genome Shotgun Sequencing of Three Listeria monocytogenes Strains Isolated from a Ready-to-Eat Salad-Producing Facility in Switzerland.

Matthias Ziegler, Hyein Jang, Gopal Gopinath, Jule Anna Horlbog, Roger Stephan, Claudia Guldimann,

Ready-to-eat (RTE) raw foods harbor the risk of transmitting Listeria monocytogenes from the environment to the consumer. We isolated three strains from a facility producing RTE salad. These strains were used to perform challenge tests on different RTE salad products. Here, we present the shotgun genome sequences of all three ... Read more >>

Genome Announc (Genome announcements)
[2018, 6(26):]

Cited: 1 time

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Growth potential of Listeria monocytogenes in twelve different types of RTE salads: impact of food matrix, storage temperature and shelf life

Matthias Ziegler, David Kent, Roger Stephan, Claudia Guldimann,

Abstract Listeriosis is a food borne disease associated with high hospitalization and fatality rates; in 2014, EU member states reported 2194 cases with 98.9% hospitalization rates and 210 fatalities. Proper risk analysis and the development of effective food safety strategies critically depend on the knowledge of the growth characteristics of ... Read more >>

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The Listeria monocytogenes Bile Stimulon under Acidic Conditions Is Characterized by Strain-Specific Patterns and the Upregulation of Motility, Cell Wall Modification Functions, and the PrfA Regulon.

Veronica Guariglia-Oropeza, Renato H Orsi, Claudia Guldimann, Martin Wiedmann, Kathryn J Boor,

Listeria monocytogenes uses a variety of transcriptional regulation strategies to adapt to the extra-host environment, the gastrointestinal tract, and the intracellular host environment. While the alternative sigma factor SigB has been proposed to be a key transcriptional regulator that facilitates L. monocytogenes adaptation to the gastrointestinal environment, the L. monocytogenes' ... Read more >>

Front Microbiol (Frontiers in microbiology)
[2018, 9:120]

Cited: 3 times

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Cold-Shock Domain Family Proteins (Csps) Are Involved in Regulation of Virulence, Cellular Aggregation, and Flagella-Based Motility in Listeria monocytogenes.

Athmanya K Eshwar, Claudia Guldimann, Anna Oevermann, Taurai Tasara,

Cold shock-domain family proteins (Csps) are highly conserved nucleic acid binding proteins regulating the expression of various genes including those involved in stress resistance and virulence in bacteria. We show here that Csps are involved in virulence, cell aggregation and flagella-based extracellular motility of Listeria monocytogenes. A L. monocytogenes mutant ... Read more >>

Front Cell Infect Microbiol (Frontiers in cellular and infection microbiology)
[2017, 7:453]

Cited: 6 times

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Full-Genome Sequence of Listeria monocytogenes Strain H34, Isolated from a Newborn with Sepsis in Uruguay.

Francis Muchaamba, Claudia Guldimann, Taurai Tasara, María Inés Mota, Valeria Braga, Gustavo Varela, Gabriela Algorta, Jochen Klumpp, Marco Jermini, Roger Stephan,

The foodborne pathogen Listeria monocytogenes causes severe disease mainly in the vulnerable populations of the young, old, pregnant, and immunocompromised. Here, we present the genome sequence of L. monocytogenes H34, a serotype 1/2b, lineage I, sequence type 489 (ST489) strain, isolated from a neonatal sepsis case in Uruguay. ... Read more >>

Genome Announc (Genome announcements)
[2017, 5(24):]

Cited: 0 times

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Comparative Phenotypic and Genotypic Analysis of Swiss and Finnish Listeria monocytogenes Isolates with Respect to Benzalkonium Chloride Resistance.

Anja B Meier, Claudia Guldimann, Annukka Markkula, Anna Pöntinen, Hannu Korkeala, Taurai Tasara,

Reduced susceptibility of Listeria monocytogenes to benzalkonium chloride (BC), a quaternary ammonium compound widely used in food processing and hospital environments, is a growing public health and food safety concern. The minimal inhibitory concentration of BC on 392 L. monocytogenes strains from Switzerland (CH) and Finland (FIN) was determined. Within ... Read more >>

Front Microbiol (Frontiers in microbiology)
[2017, 8:397]

Cited: 11 times

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Stochastic and Differential Activation of σB and PrfA in Listeria monocytogenes at the Single Cell Level under Different Environmental Stress Conditions.

Claudia Guldimann, Veronica Guariglia-Oropeza, Sophia Harrand, David Kent, Kathryn J Boor, Martin Wiedmann,

During host infection, the foodborne pathogen Listeria monocytogenes must sense and respond to rapidly changing environmental conditions. Two transcriptional regulators, the alternative sigma factor B (σB) and the Positive Regulatory Factor A (PrfA), are key contributors to the transcriptomic responses that enable bacterial survival in the host gastrointestinal tract and ... Read more >>

Front Microbiol (Frontiers in microbiology)
[2017, 8:348]

Cited: 2 times

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Listeria monocytogenes sequence type 1 is predominant in ruminant rhombencephalitis.

Margaux Dreyer, Lisandra Aguilar-Bultet, Sebastian Rupp, Claudia Guldimann, Roger Stephan, Alexandra Schock, Arthur Otter, Gertraud Schüpbach, Sylvain Brisse, Marc Lecuit, Joachim Frey, Anna Oevermann,

Listeria (L.) monocytogenes is an opportunistic pathogen causing life-threatening infections in diverse mammalian species including humans and ruminants. As little is known on the link between strains and clinicopathological phenotypes, we studied potential strain-associated virulence and organ tropism in L. monocytogenes isolates from well-defined ruminant cases of clinical infections and ... Read more >>

Sci Rep (Scientific reports)
[2016, 6:36419]

Cited: 12 times

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Resilience in the Face of Uncertainty: Sigma Factor B Fine-Tunes Gene Expression To Support Homeostasis in Gram-Positive Bacteria.

Claudia Guldimann, Kathryn J Boor, Martin Wiedmann, Veronica Guariglia-Oropeza,

Gram-positive bacteria are ubiquitous and diverse microorganisms that can survive and sometimes even thrive in continuously changing environments. The key to such resilience is the ability of members of a population to respond and adjust to dynamic conditions in the environment. In bacteria, such responses and adjustments are mediated, at ... Read more >>

Appl. Environ. Microbiol. (Applied and environmental microbiology)
[2016, 82(15):4456-4469]

Cited: 11 times

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Increased spread and replication efficiency of Listeria monocytogenes in organotypic brain-slices is related to multilocus variable number of tandem repeat analysis (MLVA) complex.

Claudia Guldimann, Michelle Bärtschi, Joachim Frey, Andreas Zurbriggen, Torsten Seuberlich, Anna Oevermann,

Listeria (L.) monocytogenes causes fatal infections in many species including ruminants and humans. In ruminants, rhombencephalitis is the most prevalent form of listeriosis. Using multilocus variable number tandem repeat analysis (MLVA) we recently showed that L. monocytogenes isolates from ruminant rhombencephalitis cases are distributed over three genetic complexes (designated A, ... Read more >>

BMC Microbiol. (BMC microbiology)
[2015, 15:134]

Cited: 5 times

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A naturally occurring prfA truncation in a Listeria monocytogenes field strain contributes to reduced replication and cell-to-cell spread.

Sebastian Rupp, Lisandra Aguilar-Bultet, Vidhya Jagannathan, Claudia Guldimann, Cord Drögemüller, Christiane Pfarrer, Beatriz Vidondo, Torsten Seuberlich, Joachim Frey, Anna Oevermann,

Listeria (L.) monocytogenes is an environmental bacterium that may become an intracellular pathogen upon ingestion to cause gastroenteritis, septicaemia, abortions, and/or fatal infections of the central nervous system. We here describe a L. monocytogenes field strain (JF5171) isolated from a bovine placenta in the context of abortion, which exhibited attenuation ... Read more >>

Vet. Microbiol. (Veterinary microbiology)
[2015, 179(1-2):91-101]

Cited: 8 times

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Erratum: Increased spread and replication efficiency of Listeria monocytogenes in organotypic brain-slices is related to multilocus variable number of tandem repeat analysis (MLVA) complex.

Claudia Guldimann, Michelle Bärtschi, Joachim Frey, Andreas Zurbriggen, Torsten Seuberlich, Anna Oevermann,

BMC Microbiol. (BMC microbiology)
[2015, 15:176]

Cited: 0 times

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Regulatory network features in Listeria monocytogenes-changing the way we talk.

Veronica Guariglia-Oropeza, Renato H Orsi, Haiyuan Yu, Kathryn J Boor, Martin Wiedmann, Claudia Guldimann,

Our understanding of how pathogens shape their gene expression profiles in response to environmental changes is ever growing. Advances in Bioinformatics have made it possible to model complex systems and integrate data from variable sources into one large regulatory network. In these analyses, regulatory networks are typically broken down into ... Read more >>

Front Cell Infect Microbiol (Frontiers in cellular and infection microbiology)
[2014, 4:14]

Cited: 4 times

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Atypical H-type bovine spongiform encephalopathy in a cow born after the reinforced feed ban on meat-and-bone meal in Europe.

Claudia Guldimann, Michaela Gsponer, Cord Drögemüller, Anna Oevermann, Torsten Seuberlich,

The significance of atypical bovine spongiform encephalopathies (BSE) in cattle for controlling the BSE epidemic is poorly understood. Here we report a case of atypical H-type BSE in a cow born after the implementation of the reinforced feed ban in Europe. This supports an etiology of H-type BSE unrelated to ... Read more >>

J. Clin. Microbiol. (Journal of clinical microbiology)
[2012, 50(12):4171-4174]

Cited: 7 times

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Ruminant organotypic brain-slice cultures as a model for the investigation of CNS listeriosis.

Claudia Guldimann, Beatrice Lejeune, Sandra Hofer, Stephen L Leib, Joachim Frey, Andreas Zurbriggen, Torsten Seuberlich, Anna Oevermann,

Central nervous system (CNS) infections in ruminant livestock, such as listeriosis, are of major concern for veterinary and public health. To date, no host-specific in vitro models for ruminant CNS infections are available. Here, we established and evaluated the suitability of organotypic brain-slices of ruminant origin as in vitro model ... Read more >>

Int J Exp Pathol (International journal of experimental pathology)
[2012, 93(4):259-268]

Cited: 11 times

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