Prof. Dr. Roger Stephan

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Completed research projects

Project leader Project title
Bürgi Prevalence of antibiotic resistances in E. coli, Enterococcus spp. and Campylobacter spp. strains isolated from weaned pigs and sows
Hächler Genotypes and antibiotic resistance profiles of Salmonella spp. and Campylobacter spp. strains isolated from human patients in Switzerland
Johler Staphylococcus aureus strains associated with foodborne intoxications
Characterization of Staphylococcus aureus strains from different origins
Johler Stephan Enterotoxin expression in S. aureus under stress relevant to food production and preservation
Lehner Different aspects of the pathogenicity of Cronobacter spp.
Identification and typing of Cronobacter spp.
Mechanisms of stress responses in Cronobacter sakazakii (Enterobacter sakazakii)
Elucidating the natural habitat of Cronobacter spp.
Lehner Stephan Development and evaluation of molecular and cultural based methods for Cronobacter sakazakii (E. sakazakii) detection
Riedel Molecular characterization of a cell-cell communication system operating in Enterobacter sakazakii
Stärk Stephan Development of an optimal strategy for monitoring antimicrobial resistance in bacteria from food animals in Switzerland
Stephan Characterization of quinolone resistance determinants in Gram negative foodborne pathogens and commensal organisms isolated along the food chain
Epidemiology of Yersinia enterocolitica in Switzerland
Behaviour of Shiga toxin-producing and non-Shiga toxin-producing Escherichia coli in the raw milk cheese production process
Identification and further characterization of selected udder pathogens isolated of bovine mastitis milk
Evaluation of commercially available methods and development of a new (pre)enrichment broth for the detection of gram negative foodborne pathogens
Whole genome sequencing of Enterobacter turicensis, Enterobacter helveticus and Enterobacter pulveris and re-examination of the their taxonomic status as members of Cronobacter
Effects of slaughter operations on the microbiological contamination of broiler carcasses
Sequencing based characterization of plasmids harbouring bla ESBL and bla Carbapenemase genes
Epidemiology of Shiga toxin producing Escherichia coli (STEC) in Switzerland
Microbiological quality of raw bulk-tank milk in Switzerland
Further characterization of Shiga toxin producing Escherichia coli (STEC) isolated from farm animals, food and humans
Arcobacter butzleri - a potential new food borne pathogen
Development of conventional and RT-PCR methods for specific detection of Mycobacterium avium subspecies paratuberculosis (MAP) in milk and tissues
Whole genome sequencing and proteomic profiling of Cronobacter turicensis
Further characterization of Staphaurex-positive and Staphaurex-neagative S. aureus isolated from bovine mastitis
Identification and characterization of Enterobacteriaceae isolated from raw ingredients, environmental samples and products of an infant formula processing plant
Stephan Hächler Enterobacteriaceae with resistance to extended-spectrum cephalosporins and carbapenem antibiotics in livestock animals, foods of animal origin and humans in Switzerland
Extended-spectrum beta-lactamase (ESBL) and carbapenemase producing Enterobacteriaceae at the wildlife-environment-human interface
Stephan Tasara Characteristics of L. monocytogens strains isolated at different steps along the food chain
Stephan Zweifel Foodborne pathogens at the wildlife-human interface
Tasara Impact of cold shock proteins in virulence of Listeria monocytogenes
Stress response mechanisms in Listeria monocytogenes
Zweifel Risk assessment and microbiological monitoring systems in meat production
Methicillin-resistant Staphylococcus aureus (MRSA) in livestock animals and foods of animal origin in Switzerland
Antimicrobial activity of decontamination treatments for poultry, pig and cattle carcasses

Last update 28.12.2015