Shigellosis Surveillance Case Definition

This document contains the case definitions for shigellosis which is nationally notifiable within Australia. This definition should be used to determine whether a case should be notified.

Page last updated: 11 May 2018

Version Summary of changes Last reviewed Implementation date
1.2

Replacement of text and add

Replacement text

Only confirmed cases should be notified replaced by Both confirmed cases and probable cases should be notified

A confirmed case requires Laboratory definitive evidence only replaced by A confirmed case requires

  1. Laboratory definitive evidence

    OR

  2. Laboratory suggestive evidence AND epidemiological evidence.

Isolation or detection of Shigella species replaced by Isolation of Shigella species.

Additional text added

Laboratory suggestive evidence

Detection of Shigella* by nucleic acid testing

Epidemiological evidence

An epidemiological link is established when there is:

  1. Contact with a confirmed case involving a plausible mode of transmission;

    OR

  2. An epidemiologically plausible food or other environmental exposure in common with one or more culture-positive cases.

*The ipaH gene is the target of all current nucleic acid tests for Shigella. However the ipaH gene is common to Shigella species and enteroinvasive Escherichia coli (EIEC) and thus is not considered laboratory definitive evidence for Shigella.

2017 1 July 2018
1.0 Initial case definition 2004 2004

Reporting

Both confirmed cases and probable cases should be notified.

Confirmed case

A confirmed case requires

  1. laboratory definitive evidence

    OR

  2. laboratory suggestive evidence AND epidemiological evidence

Laboratory definitive evidence

Isolation of Shigella species.

Laboratory suggestive evidence

Detection of Shigella* by nucleic acid testing

Epidemiological evidence

An epidemiological link is established when there is:

  1. Contact with a confirmed case involving a plausible mode of transmission;

    OR

  2. An epidemiologically plausible food or other environmental exposure in common with one or more culture-positive cases.

Probable case

A probable case requires Laboratory suggestive evidence


*The ipaH gene is the target of all current nucleic acid tests for Shigella. However the ipaH gene is common to Shigella species and enteroinvasive Escherichia coli (EIEC) and thus is not considered laboratory definitive evidence for Shigella.

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