Influenza laboratory-confirmed

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

Page last updated: 29 October 2008

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Surveillance case definition

Summary of changes
Last reviewed
Implementation date
1.1 In Laboratory definitive evidence under point 3. add Laboratory in front of 'Detection of influenza …' to read 'Laboratory detection of influenza …'. 14 August 2008 29 October 2008
1.0 Initial case definition 2004 2004


Only confirmed cases should be notified.

Confirmed cases

A confirmed case requires laboratory definitive evidence only.

Laboratory definitive evidence

1.    Isolation of influenza virus by culture from appropriate respiratory tract specimen


2.    Detection of influenza virus by nucleic acid testing from appropriate respiratory tract specimen


3.    Laboratory detection of influenza virus antigen from appropriate respiratory tract specimen


4.    IgG seroconversion or a significant increase in antibody level or a fourfold or greater rise in titre to influenza virus


5.    Single high titre by CFT or HAI to influenza virus.

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