Manual of Clinical Microbiology

155

Escherichia and Shigella

Last Updated:2022
Introduction

Members of the genera Escherichia and Shigella are most often associated with infections of the gastrointestinal…

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Escherichia

The genus Escherichia is taxonomically located within the order Enterobacterales, family Enterobacteriaceae. Escherichia coli is the type species…

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Shigella

The genus Shigella is composed of four species: S. dysenteriae, S. flexneri, S. boydii, and S. sonnei. Chromosome size…

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Collection, Transport, and Storage of Specimens

Detailed methods for the collection, transport, and storage of enteric pathogens are described in chapter 19 of this Manual. For culture‐based investigation of gastroenteritis, fresh stool…

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Identification

Colonies of Escherichia species growing on blood agar appear as large gray colonies that lack pigmentation, except for E. hermannii and E. vulneris,…

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Typing Systems

Strain typing strategies for Enterobacterales, which were previously based primarily on antigenic methods, have undergone recent and dramatic evolution with the advent of…

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Antimicrobial Susceptibilities

When isolated in pure or near‐pure culture (i.e., one or two to three potential pathogens) from an extraintestinal source, susceptibility testing is always warranted for…

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Summary

The genus Escherichia is abundant within the human body, colonizing the gastrointestinal tract, but can cause infections from gastroenteritis to meningitis when equipped with the correct…

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cover
Section Editor: Gary W. Procop

Volume Editor: Bobbi Pritt

Editors in Chief: Karen C. Carroll and Michael A. Pfaller

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