A5058319863- Enterobacteriaceae and Cronobacter Research
- Salmonella and Campylobacter epidemiology
- Listeria monocytogenes in Food Safety
- Antibiotic Resistance in Bacteria
- Escherichia coli research studies
- Probiotics and Fermented Foods
- Viral gastroenteritis research and epidemiology
- Antimicrobial Resistance in Staphylococcus
- Bacteriophages and microbial interactions
- Mycobacterium research and diagnosis
- Microbial Inactivation Methods
- Milk Quality and Mastitis in Dairy Cows
- Food Safety and Hygiene
- Microbial infections and disease research
- Pharmaceutical and Antibiotic Environmental Impacts
- Essential Oils and Antimicrobial Activity
- Plant Pathogenic Bacteria Studies
- Genomics and Phylogenetic Studies
- Bacterial biofilms and quorum sensing
- Identification and Quantification in Food
- Clostridium difficile and Clostridium perfringens research
- Bacterial Identification and Susceptibility Testing
- Vibrio bacteria research studies
- Meat and Animal Product Quality
- Microbial Metabolism and Applications
University of Zurich
2016-2025
University of Liège
2024
Austrian Agency for Health and Food Safety
2021
Kantonsschule Enge
2020-2021
Institute for Food Safety and Health
2000-2020
The Sanskrit College and University
2017
Praxis
2013
Institut für Hygiene und Umwelt
1997-2012
Bharathidasan University
2001
Landesforschungsanstalt für Landwirtschaft und Fischerei Mecklenburg-Vorpommern
1973
[Enterobacter] sakazakii is an opportunistic pathogen that can cause infections in neonates. This study further clarifies the taxonomy of isolates described as [E.] and completes formal description proposed reclassification these organisms novel species subspecies within a genus, Cronobacter gen. nov. was first defined 1980, however recent polyphasic taxonomic analysis has determined this group consists several genomospecies. In study, phenotypic descriptions are expanded using Biotype 100...
Abstract Background The impact of food animals as a possible reservoir for extended-spectrum beta-lactamase (ESBL) producing Enterobacteriaceae , and the dissemination such strains into production chain need to be assessed. In this study 334 fecal samples from pigs, cattle, chicken sheep were investigated at slaughter. Additionally, 100 raw milk samples, representing bulk tank different dairy farms, 104 minced meat (pork beef) 67 E. coli isolates cattle mastitis analyzed. Results As many...
Abstract Background Enterobacter sakazakii is an opportunistic pathogen that can cause infections such as necrotizing enterocolitis, bacteraemia, meningitis and brain abscess/lesions. When the species was defined in 1980, 15 biogroups were described it suggested these could represent multiple species. In this study taxonomic relationship of strains E. further investigated. Results Strains identified divided into separate groups on basis f-AFLP fingerprints, ribopatterns full-length 16S rRNA...
ABSTRACT One of the currently most relevant resistance mechanisms in Enterobacteriaceae is production enzymes that lead to modern expanded-spectrum cephalosporin and even carbapenem resistance, mainly extended-spectrum β-lactamases (ESBLs) carbapenemases. A worrisome aspect spread ESBL carbapenemase producers into environment. The aim present study was assess occurrence ESBL- carbapenemase-producing further characterize rivers lakes Switzerland. ESBL-producing were detected 21 (36.2%) 58...
ABSTRACT Listeria monocytogenes presents a significant concern for the food industry due to its ability persist in processing environment. One of factors contributing persistence is decreased sensitivity disinfectants. Our objective was assess diversity L. disinfectants by testing response 1,671 L . isolates quaternary ammonium compounds (QACs) and 414 peracetic acid (PAA) using broth microdilution growth curve analysis assays, respectively, categorize into sensitive tolerant. A high...
The gram-positive bacterium Listeria monocytogenes is a food-borne pathogen of both public health and food safety significance. It possesses three small, highly homologous protein members the cold shock (Csp) family. We used gene expression analysis set mutants with single, double, triple deletions csp genes to evaluate roles CspA, CspB, CspD in osmotic (NaCl) stress adaptation responses L. monocytogenes. All Csps are dispensable for growth at optimal temperature (37 degrees C). These...
A total of 2,662 samples, collected from March to September 2009 in Switzerland, were tested for the presence meticillin-resistant Staphylococcus aureus (MRSA). The collection comprised nasal swabs 148 pig farmers, 133 veterinarians, 179 slaughterhouse employees, 800 pigs, 300 calves, 400 cattle, 100 pooled neck skin chicken carcasses, and 460 food samples animal origin. Moreover, 142 S. strains, isolated bovine mastitis milk, included study. Twenty (<1%; four 10 three one young bull, two...
ABSTRACT To examine to what extent fresh vegetables imported into Switzerland represent carriers of extended-spectrum-β-lactamase (ESBL)-producing Enterobacteriaceae , 169 samples different types from the Dominican Republic, India, Thailand, and Vietnam were analyzed. Overall, 25.4% vegetable yielded one or more ESBL-producing 78.3% which multidrug resistant. Sixty isolates obtained: Escherichia coli 26; Klebsiella pneumoniae Enterobacter cloacae 6; aerogenes 1; Cronobacter sakazakii 1. We...
Methicillin-resistant coagulase-negative staphylococci (MR-CNS) are of increasing importance to animal and public health. In veterinary medicine along the meat milk production line, only limited data were so far available on MR-CNS characteristics. The aim present study was evaluate prevalence MR-CNS, identify detected species level, assess antibiotic resistance profiles isolated strains. After two-step enrichment growth chromogenic agar, in 48.2% samples from livestock chicken carcasses,...
Recently, a taxonomical re-evaluation of the genus Enterobacter, based on multi-locus sequence typing (MLST) analysis, has led to proposal that species Enterobacter pulveris, helveticus and turicensis should be reclassified as novel Cronobacter. In present work, new genome-scale analyses, including average nucleotide identity, phylogeny k-mer coupled with previously reported DNA-DNA hybridization values biochemical characterization strongly indicate these three are not members Cronobacter,...
We characterized 97 non-O157 Shiga toxin (stx)-producing Escherichia coli strains isolated from human patients during 2000-2009 the national reference laboratory in Switzerland. These belonged to 40 O:H serotypes; 4 serotypes (O26:H11/H-, O103:H2, O121:H19, and O145:H28/H-) accounted for 46.4% of strains. Nonbloody diarrhea was reported by 23.2% patients, bloody 56.8%. Hemolytic uremic syndrome developed 40.0% patients; serotype O26:H11/H- most often associated with this syndrome. Forty-five...
ABSTRACT In this study, fecal samples from 586 healthy humans were investigated to determine the occurrence of extended-spectrum-β-lactamase (ESBL)-producing Enterobacteriaceae in Swiss people. A total 5.8% human yielded ESBL producers, and all 34 isolated strains Escherichia coli . PCR analysis revealed that 14 produced CTX-M-15, 10 CTX-M-1, 7 CTX-M-14, 2 CTX-M-2 ESBLs. One strain SHV-12 ESBL. Of isolates, 15 additional TEM-1 broad-spectrum β-lactamases. By serotyping, a high degree...
Staphylococcal food poisoning represents the most prevalent foodborne intoxication worldwide. It is caused by oral intake of enterotoxins preformed Staphylococcus aureus in food. The relevance newly described outbreaks staphylococcal controversially discussed. Although SEG, SEI, SEM, SEN, and SEO elicit emesis a monkey feeding assay, there has been no conclusive proof their emetic activity humans. In this study, we provide further evidence suggesting that one these or combination cause...