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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...

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Related Experiment Video

Updated: May 21, 2026

An Allelotyping PCR for Identifying Salmonella enterica serovars Enteritidis, Hadar, Heidelberg, and Typhimurium
12:18

An Allelotyping PCR for Identifying Salmonella enterica serovars Enteritidis, Hadar, Heidelberg, and Typhimurium

Published on: July 22, 2011

Multilocus sequence typing as a replacement for serotyping in Salmonella enterica.

Mark Achtman1, John Wain, François-Xavier Weill

  • 1Environmental Research Institute and Department of Microbiology, University College Cork, Cork, Ireland. m.achtman@ucc.ie

Plos Pathogens
|June 28, 2012
PubMed
Summary

Multilocus Sequence Typing (MLST) reveals that Salmonella serovars are not reliable evolutionary groupings. MLST provides a more accurate classification of Salmonella enterica subspecies enterica, replacing traditional serotyping.

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Quasi-metagenomic Analysis of Salmonella from Food and Environmental Samples
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Quasi-metagenomic Analysis of Salmonella from Food and Environmental Samples

Published on: October 25, 2018

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Last Updated: May 21, 2026

An Allelotyping PCR for Identifying Salmonella enterica serovars Enteritidis, Hadar, Heidelberg, and Typhimurium
12:18

An Allelotyping PCR for Identifying Salmonella enterica serovars Enteritidis, Hadar, Heidelberg, and Typhimurium

Published on: July 22, 2011

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

Area of Science:

  • Microbiology
  • Genomics
  • Bacterial Taxonomy

Background:

  • Traditional Salmonella enterica subspecies enterica classification relies on serological and nutritional characteristics.
  • Serovar designations are widely used but may not accurately reflect genetic relatedness.

Purpose of the Study:

  • To evaluate the accuracy of Salmonella serotyping by comparing it with Multilocus Sequence Typing (MLST).
  • To determine if serovars represent natural evolutionary groupings within Salmonella enterica subspecies enterica.

Main Methods:

  • Utilized Multilocus Sequence Typing (MLST) to analyze 4,257 Salmonella enterica subspecies enterica isolates.
  • Assigned isolates to 1,092 sequence types (STs) and grouped STs into 138 eBurstGroups (eBGs).
  • Compared MLST-based groupings (eBGs) with traditional serovar classifications.

Main Results:

  • MLST identified 1,092 sequence types (STs) and 138 eBurstGroups (eBGs), revealing complex relationships.
  • Many eBGs contained multiple serovars, and most serovars were polyphyletic, spanning unrelated eBGs.
  • Serovar designations, particularly for Paratyphi B, Java, and Choleraesuis, were found to be misleading regarding evolutionary relationships.

Conclusions:

  • Serovar classification of Salmonella enterica subspecies enterica is often inaccurate and fails to recognize natural evolutionary groupings.
  • MLST provides a more robust and accurate method for classifying Salmonella, reflecting true evolutionary relationships.
  • Recommend replacing serotyping with MLST or equivalent methods for Salmonella classification.