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Related Concept Videos

Modern Molecular Taxonomy01:29

Modern Molecular Taxonomy

Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
Bacterial Gastroenteritis01:18

Bacterial Gastroenteritis

Bacterial gastroenteritis, characterized by diarrhea, abdominal cramps, and vomiting, is often caused by ingestion of contaminated food or water and is frequently associated with pathogenic Escherichia coli strains. These microbes exploit two principal mechanisms to inflict disease.Shiga toxin–producing E. coli, also referred to as STEC—notably O157:H7—release Shiga toxins that target ribosomes, blocking protein synthesis. The B subunit of the toxin binds the host glycolipid receptor...
Methods of Classification and Identification01:28

Methods of Classification and Identification

Bacterial identification relies on a diverse array of techniques to classify and understand microorganisms, each tailored to uncover specific characteristics. Traditional morphological approaches, while still valuable, are limited for closely related or structurally simple organisms. Modern methods integrate biochemical, serological, genetic, and advanced molecular tools to achieve greater accuracy.Morphological and Biochemical TechniquesMorphological characteristics, such as cell shape and...
Evolution of Microbial Genome01:08

Evolution of Microbial Genome

Microbial genome evolution is a highly dynamic process shaped by continual gene gain and loss across species and strains. This genomic flexibility allows microorganisms to adapt rapidly to environmental pressures and interactions with other organisms. Central to understanding this diversity is the distinction between the core and pan genomes.The core genome comprises the genes shared by all sampled strains of a species, representing essential functions needed for fundamental cellular processes.
Microbial Classification System01:24

Microbial Classification System

Classification is the process of organizing organisms into hierarchically inclusive groups based on their phenotypic similarities or evolutionary relationships. A species comprises one or more strains, and closely related species are grouped into genera. Genera are further classified into families, families into orders, orders into classes, and so forth, up to the domain level, which is the broadest taxonomic rank derived from a combination of phenotypic and genotypic data.The nomenclature of...
Applications of Molecular Taxonomy01:20

Applications of Molecular Taxonomy

Molecular taxonomy has revolutionized the understanding and classification of bacteria, providing precise insights into their diversity, evolutionary relationships, and ecological roles. By utilizing molecular techniques such as DNA sequencing and fingerprinting, researchers have made significant strides in various fields related to bacterial studies.Resolving Taxonomic AmbiguitiesMolecular taxonomy has been instrumental in distinguishing closely related bacterial species initially thought to...

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Updated: May 12, 2026

Quasi-metagenomic Analysis of Salmonella from Food and Environmental Samples
06:12

Quasi-metagenomic Analysis of Salmonella from Food and Environmental Samples

Published on: October 25, 2018

Salmonella source attribution based on microbial subtyping.

Lisa Barco1, Federica Barrucci, John Elmerdahl Olsen

  • 1OIE, National Reference Laboratory for Salmonella, Istituto Zooprofilattico Sperimentale delle Venezie, Viale dell'Università 10, Padova, 35020 Legnaro, Italy.

International Journal of Food Microbiology
|April 9, 2013
PubMed
Summary

Identifying foodborne illness sources is key to food safety. This review explores microbial subtyping methods for Salmonella, including traditional and molecular techniques, to improve source attribution and interventions.

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Heuristic Mining of Hierarchical Genotypes and Accessory Genome Loci in Bacterial Populations
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Last Updated: May 12, 2026

Quasi-metagenomic Analysis of Salmonella from Food and Environmental Samples
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Published on: October 25, 2018

Heuristic Mining of Hierarchical Genotypes and Accessory Genome Loci in Bacterial Populations
08:03

Heuristic Mining of Hierarchical Genotypes and Accessory Genome Loci in Bacterial Populations

Published on: December 7, 2021

Area of Science:

  • Food safety
  • Microbiology
  • Epidemiology

Background:

  • Source attribution of foodborne diseases is crucial for effective food safety interventions.
  • Microbial subtyping is a primary method for tracing human foodborne infections to their sources.
  • Current Salmonella source attribution models rely on serotyping and phage-typing data.

Purpose of the Study:

  • To review the current state of Salmonella source attribution using microbial subtyping.
  • To summarize existing microbial subtyping attribution models for Salmonella.
  • To discuss the applicability of conventional and molecular typing methods in EU laboratories for Salmonella source attribution.

Main Methods:

  • Review of existing literature on microbial subtyping for Salmonella source attribution.
  • Analysis of conventional phenotypic typing methods (serotyping, phage-typing).
  • Evaluation of commonly applied molecular typing methods in European Union (EU) laboratories.

Main Results:

  • Phenotypic methods like serotyping and phage-typing are established for Salmonella source attribution.
  • Molecular methods show potential for Salmonella source attribution, similar to their use for other pathogens like Campylobacter.
  • The review assesses the suitability of various typing methods for EU-based studies.

Conclusions:

  • Microbial subtyping is essential for understanding Salmonella transmission routes.
  • Both traditional and molecular typing methods have roles in Salmonella source attribution.
  • Further evaluation of molecular techniques is needed for their widespread application in EU Salmonella surveillance.