Full Text Journal Articles by
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Lineage specific evolution and gene flow in Listeria monocytogenes is independent of bacteriophages.

Roxana Zamudio, Richard D Haigh, Joseph D Ralph, Megan De Ste Croix, Taurai Tasara, Katrin Zurfluh, Min Jung Kwun, Andrew D Millard, Stephen D Bentley, Nicolas J Croucher, Roger Stephan, Marco R Oggioni,

Listeria monocytogenes is a foodborne pathogen causing systemic infection with high mortality. To allow efficient tracing of outbreaks a clear definition of the genomic signature of a cluster of related isolates is required, but lineage specific characteristics call for a more detailed understanding of evolution. In our work we used ... Read more >>

Environ. Microbiol. (Environmental microbiology)
[2020, :]

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Temperature-Dependent Growth Characteristics of Bacillus thuringiensis in a Ratatouille Food Model.

Nicole Heini, Roger Stephan, Matthias Filter, Carolina Plaza-Rodriguez, Hendrik Frentzel, Monika Ehling-Schulz, Sophia Johler,

ABSTRACT:In contrast to Bacillus cereus, the role of Bacillus thuringiensis in foodborne illness has been controversially discussed. As B. thuringiensis-based biopesticides containing a mixture of crystal toxins and viable spores are widely used, a current European Food Safety Authority opinion underlines the need for additional data to enable risk assessment. ... Read more >>

J. Food Prot. (Journal of food protection)
[2020, 83(5):816-820]

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First case of Streptococcus suis infection in Switzerland: An emerging public health problem?

Flaminia Olearo, Annalisa Marinosci, Roger Stephan, Abdessalam Cherkaoui, Gesuele Renzi, Nadia Gaia, Stefano Leo, Vladimir Lazarevic, Jacques Schrenzel,

Travel Med Infect Dis (Travel medicine and infectious disease)
[2020, :101590]

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Strain Variability of Listeria monocytogenes under NaCl Stress Elucidated by a High-Throughput Microbial Growth Data Assembly and Analysis Protocol.

Mariella Aalto-Araneda, Anna Pöntinen, Maiju Pesonen, Jukka Corander, Annukka Markkula, Taurai Tasara, Roger Stephan, Hannu Korkeala,

Listeria monocytogenes causes the severe foodborne illness listeriosis and survives in food-associated environments due to its high stress tolerance. A data assembly and analysis protocol for microbial growth experiments was compiled to elucidate the strain variability of L. monocytogenes stress tolerance. The protocol includes measurement of growth ability under stress ... Read more >>

Appl. Environ. Microbiol. (Applied and environmental microbiology)
[2020, 86(6):]

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The Secretion of Toxins and Other Exoproteins of Cronobacter: Role in Virulence, Adaption, and Persistence.

Hyein Jang, Gopal R Gopinath, Athmanya Eshwar, Shabarinath Srikumar, Scott Nguyen, Jayanthi Gangiredla, Isha R Patel, Samantha B Finkelstein, Flavia Negrete, JungHa Woo, YouYoung Lee, Séamus Fanning, Roger Stephan, Ben D Tall, Angelika Lehner,

: Cronobacter species are considered an opportunistic group of foodborne pathogenic bacteria capable of causing both intestinal and systemic human disease. This review describes common virulence themes shared among the seven Cronobacter species and describes multiple exoproteins secreted by Cronobacter, many of which are bacterial toxins that may play a ... Read more >>

Microorganisms (Microorganisms)
[2020, 8(2):]

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Rapid high resolution melting assay to differentiate Streptococcus suis serotypes 2, 1/2, 1, and 14.

Simone Scherrer, Fenja Rademacher, Nathalie Spoerry Serrano, Jacques Schrenzel, Marcelo Gottschalk, Roger Stephan, Patricia Landolt,

This rapid high resolution melting (HRM) assay allows distinguishing between Streptococcus suis serotype pairs 2 and 1/2 as well as 1 and 14, respectively, based on a single-nucleotide polymorphism within capsular polysaccharide synthesis gene cluster K. This assay is easy to implement and identifies potential zoonotic serotypes. ... Read more >>

Microbiologyopen (MicrobiologyOpen)
[2020, 9(4):e995]

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Phenotypic and Genotypic Traits of Vancomycin-Resistant Enterococci from Healthy Food-Producing Animals.

Valerie Wist, Marina Morach, Marianne Schneeberger, Nicole Cernela, Marc J A Stevens, Katrin Zurfluh, Roger Stephan, Magdalena Nüesch-Inderbinen,

Food-producing animals may be a reservoir of vancomycin-resistant enterococci (VRE), potentially posing a threat to animal and public health. The aims of this study were to estimate the faecal carriage of VRE among healthy cattle (n = 362), pigs (n = 350), sheep (n = 218), and poultry (n = ... Read more >>

Microorganisms (Microorganisms)
[2020, 8(2):]

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Antimicrobial resistant and extended-spectrum ß-lactamase (ESBL) producing Escherichia coli isolated from fecal samples of African dromedary camels.

Magdalena Nüesch-Inderbinen, Patrick Kindle, Melinda Baschera, Anne Liljander, Jörg Jores, Victor Max Corman, Roger Stephan,

This study was conducted to determine the distribution of antimicrobial resistance among Escherichia coli isolated from feces of healthy dromedary camels in Kenya. A total of 162 fecal samples were cultivated for E. coli. Samples were also subcultivated to detect E. coli with extended-spectrum ß-lactamases (ESBLs). Antimicrobial susceptibility testing (AST) ... Read more >>

(Scientific African)
[2020, 7:e00274-e00274]

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Detection of Psychrophilic Clostridium spp. Causing "Blown Pack" Spoilage in Meat Juice Samples from Chilled Vacuum-Packed Beef and Lamb Meat Imported from Different Countries to Switzerland.

Joseph Wambui, Sabrina Püntener, Sabrina Corti, Nicole Cernela, Roger Stephan,

"Blown pack" spoilage (BPS) of chilled vacuum-packed meat is mainly caused by anaerobic and psychrophilic Clostridium spp., including C. estertheticum, C. gasigenes, C. frigoriphilum, and C. frigidicarnis. Recently, its occurrence has been reported in several countries, especially in internationally traded meat. Therefore, this study aimed at detecting the occurrence of ... Read more >>

J. Food Prot. (Journal of food protection)
[2020, 83(1):56-59]

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Reuterin Demonstrates Potent Antimicrobial Activity Against a Broad Panel of Human and Poultry Meat Campylobacter spp. Isolates.

Paul Tetteh Asare, Katrin Zurfluh, Anna Greppi, Denise Lynch, Clarissa Schwab, Roger Stephan, Christophe Lacroix,

Reuterin is a broad-spectrum antimicrobial system produced by specific strains of Lactobacillus reuteri during anaerobic metabolism of glycerol. Acrolein is the main component responsible for its antimicrobial activity. Here, the sensitivity of Campylobacter jejuni (n = 51) and Campylobacter coli (n = 20) isolates from chicken meat and human stool ... Read more >>

Microorganisms (Microorganisms)
[2020, 8(1):]

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A novel lineage of ceftriaxone-resistant Salmonella Typhi from India that is closely related to XDR S. Typhi found in Pakistan.

Ranjit Sah, Suzanne Donovan, Helena M B Seth-Smith, Guido Bloemberg, Daniel Wüthrich, Roger Stephan, Shusila Kataria, Mahadevan Kumar, Sonam Singla, Vikas Deswal, Amarjeet Kaur, Andreas Neumayr, Vladimira Hinic, Adrian Egli, Esther Kuenzli,

Two MDR Salmonella Typhi isolates from India were found by whole genome sequencing to be closely related to the 2016 XDR S. Typhi outbreak strain from Pakistan. The Indian isolates have no chromosomal AMR cassette, but carry the IncY plasmid p60006. Both isolates are susceptible to chloramphenicol, azithromycin and carbapenems. ... Read more >>

Clin. Infect. Dis. (Clinical infectious diseases : an official publication of the Infectious Diseases Society of America)
[2019, :]

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Molecular types, virulence profiles and antimicrobial resistance of Escherichia coli causing bovine mastitis.

Magdalena Nüesch-Inderbinen, Nadine Käppeli, Marina Morach, Corinne Eicher, Sabrina Corti, Roger Stephan,

Background:Escherichia coli is an important aetiological agent of bovine mastitis worldwide. Methods:In this study, 82 E. coli from bovine mastitis milk samples from 49 farms were analysed for their genetic diversity using phylogenetic grouping and multilocus sequence typing. The isolates were examined by PCR for a selection of virulence factors ... Read more >>

Vet Rec Open (Veterinary record open)
[2019, 6(1):e000369]

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Raw meat-based diets for companion animals: a potential source of transmission of pathogenic and antimicrobial-resistant Enterobacteriaceae.

Magdalena Nüesch-Inderbinen, Andrea Treier, Katrin Zurfluh, Roger Stephan,

Feeding pets raw meat-based diets (RMBDs) has become increasingly popular but may constitute a risk due to the contamination with pathogenic and antimicrobial-resistant (AMR) bacteria. The aim of this study was to evaluate commercially available RMBDs with regard to microbiological quality and occurrence of AMR Enterobacteriaceae. Of 51 RMBD samples, ... Read more >>

R Soc Open Sci (Royal Society open science)
[2019, 6(10):191170]

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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):]

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Isolation and comparative genomic analysis of reuterin-producing Lactobacillus reuteri from poultry gastrointestinal tract

Anna Greppi, Paul Tetteh Asare, Clarissa Schwab, Niklaus Zemp, Roger Stephan, Christophe Lacroix,

Abstract Lactobacillus reuteri is a natural inhabitant of selected animal and human gastrointestinal tract (GIT). Certain strains have the capacity to transform glycerol to 3-hydroxypropionaldehyde (3-HPA), further excreted to form reuterin, a potent antimicrobial system. Reuterin-producing strains may be applied as a natural antimicrobial in feed to prevent pathogen colonization ... Read more >>

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Siblings with typhoid fever: An investigation of intrafamilial transmission, clonality, and antibiotic susceptibility.

Patrick M Meyer Sauteur, Marc J A Stevens, Paolo Paioni, Daniel Wüthrich, Adrian Egli, Roger Stephan, Christoph Berger, Guido V Bloemberg,

BACKGROUND:Typhoid fever usually manifests as an acute disease. However, asymptomatic carriage with Salmonella Typhi may occur. This study investigated a family setting of severe typhoid fever in Switzerland months after return from Bangladesh. METHOD:Standard microbiological procedures were performed. Testing for S. Typhi IgM antibodies was done using a novel immunochromographic ... Read more >>

Travel Med Infect Dis (Travel medicine and infectious disease)
[2020, 34:101498]

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Population structure and toxin gene profiles of Bacillus cereus sensu lato isolated from flour products.

Patrick Kindle, Danai Etter, Roger Stephan, Sophia Johler,

Data on the occurrence, population structure and toxinogenic potential of Bacillus cereus sensu lato isolated from flour is essential to enable improved risk assessment. We aimed to provide data on the occurrence of B. cereus sensu lato in flour products at retail level. In addition, we screened the isolates for ... Read more >>

FEMS Microbiol. Lett. (FEMS microbiology letters)
[2019, 366(20):]

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Microarray based genetic profiling of Staphylococcus aureus isolated from abattoir byproducts of pork origin.

Marina Morach, Nadine Käppeli, Mirjam Hochreutener, Sophia Johler, Jérôme Julmi, Roger Stephan, Danai Etter,

Many parts of pork meat processing are currently not used for human consumption in Switzerland, although they are of great nutritional value. Therefore, data on the occurrence of pathogenic organisms on byproducts is extremely scarce and the prevalence and population structure of Staphylococcus aureus on meat processing sidestreams is unknown. ... Read more >>

PLoS ONE (PloS one)
[2019, 14(9):e0222036]

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Symposium report: One Health meets sequencing.

Adrian Egli, Daniel Koch, Jürg Danuser, Rene S Hendriksen, Susanne Driesen, Diana Coman Schmid, Richard Neher, Mirjam Mäusezahl, Helena M B Seth-Smith, Guido Bloemberg, Sarah Tschudin-Sutter, Andrea Endimiani, Vincent Perreten, Gilbert Greub, Jacques Schrenzel, Roger Stephan,

Microbes Infect. (Microbes and infection)
[2020, 22(1):1-7]

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Three-reaction high-resolution melting assay for rapid differentiation of Mycobacterium tuberculosis complex members.

Patricia Landolt, Roger Stephan, Marc J A Stevens, Simone Scherrer,

The possibility of introducing a reliable assay for a quick identification and differentiation of the main species of Mycobacterium tuberculosis complex (MTBC) supports the improvement of efficient tuberculosis combating strategies worldwide. Commercially available assays are often based on cultured samples; however, due to the long cultivation time of mycobacteria, results ... Read more >>

Microbiologyopen (MicrobiologyOpen)
[2019, 8(12):e919]

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Full Genome Sequence of pT3, a Multiresistant Plasmid Carrying the mcr-3.5 Colistin Resistance Gene, Recovered from an Extended-Spectrum-β-Lactamase-Producing Escherichia coli Isolate from Crickets Sold as Food.

Katrin Zurfluh, Marc J A Stevens, Melissa Bucher, Laurent Poirel, Patrice Nordmann, Roger Stephan,

Here, we sequenced multidrug resistance plasmid pT3, which encodes mcr-3.5 and other resistance genes. The cooccurrence of mcr genes and other resistance genes on a single plasmid is of concern. ... Read more >>

Microbiol Resour Announc (Microbiology resource announcements)
[2019, 8(29):]

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Whole-Genome Sequencing-Based Characterization of 100 Listeria monocytogenes Isolates Collected from Food Processing Environments over a Four-Year Period.

Daniel Hurley, Laura Luque-Sastre, Craig T Parker, Steven Huynh, Athmanya K Eshwar, Scott V Nguyen, Nicholas Andrews, Alexandra Moura, Edward M Fox, Kieran Jordan, Angelika Lehner, Roger Stephan, Séamus Fanning,

Listeria monocytogenes is frequently found in foods and processing facilities, where it can persist, creating concerns for the food industry. Its ability to survive under a wide range of environmental conditions enhances the potential for cross-contamination of the final food products, leading to possible outbreaks of listeriosis. In this study, ... Read more >>

mSphere (mSphere)
[2019, 4(4):]

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Sequence Types and Antimicrobial Resistance Profiles of Streptococcus uberis Isolated From Bovine Mastitis.

Nadine Käppeli, Marina Morach, Katrin Zurfluh, Sabrina Corti, Magdalena Nüesch-Inderbinen, Roger Stephan,

Bovine mastitis is one of the most common diseases among dairy cows and causes high economic losses in dairy industries worldwide. Streptococcus uberis is one of the most frequently identified pathogens causing the disease. In this study, 153 S. uberis strains isolated from mastitis milk samples were analyzed for their ... Read more >>

Front Vet Sci (Frontiers in veterinary science)
[2019, 6:234]

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Morphological and Molecular Characterization of a New Mycobacterium avium Subsp. paratuberculosis S-Type Strain Genotype in Goats.

Simone Scherrer, Roger Stephan, Jon Paulin Zumthor, Anja Kipar, Frauke Seehusen,

Paratuberculosis is a chronic bacterial disease of global importance mainly in domestic and wild ruminants, caused by Mycobacterium avium subsp. paratuberculosis (MAP). In goats, paratuberculosis is mostly caused by the "C-type" (cattle) and in a few cases by the "S-type" (sheep) strain of MAP. In 2017, a caprine S-type III ... Read more >>

Front Vet Sci (Frontiers in veterinary science)
[2019, 6:250]

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Draft Genome Sequence of Salmonella bongori N19-781, a Clinical Strain from a Patient with Diarrhea.

Marc J A Stevens, Nicole Cernela, Andrea Müller, Roger Stephan, Guido Bloemberg,

The genome of Salmonella bongori N19-781, a strain isolated from a patient with diarrhea, was sequenced. It consists of a 4.5-Mbp chromosome. ... Read more >>

Microbiol Resour Announc (Microbiology resource announcements)
[2019, 8(29):]

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