Australian Influenza Activity Update – week ending 22 May 2015 (#05/2015)

The Australian Influenza Surveillance Report and Activity Updates are compiled from a number of data sources, which are used to monitor influenza activity and severity in the community. These data sources include laboratory-confirmed notifications to NNDSS; influenza associated hospitalisations; sentinel influenza-like illness (ILI) reporting from general practitioners and emergency departments; ILI-related call centre calls and community level surveys; and sentinel laboratory testing results.

Page last updated: 01 June 2013

The Australian Influenza Surveillance Report is published on a fortnightly basis during the influenza season, typically between May and October. Influenza activity updates will be published outside of the seasonal period. A more in-depth end-of-season report is also published in Communicable Diseases Intelligence journal.

Australian Influenza Activity Update - week ending 22 May 2015

  • Australia is currently in the inter-seasonal period for influenza. Overall influenza activity is low and stable, but higher than at the same time in previous years.
  • Influenza activity across jurisdictions is variable. Influenza activity is higher in most jurisdictions compared to the same period in previous years.
  • This year to date, influenza A is the predominant circulating virus type; of those viruses where subtyping data are available, influenza A(H3N2) is the most common. Influenza B is circulating at increasing levels in recent weeks.
  • Of the limited number of isolates that have been further characterised for similarity with the vaccine components, influenza A viruses appear to be well matched. Over 80% of the influenza B viruses characterised are a match to the trivalent vaccine strain; the remaining influenza B viruses matching the additional strain in the quadrivalent vaccine.
  • Influenza-like illness (ILI) levels detected through the sentinel GP ILI surveillance system are increasing. In the most recent fortnight, rhinovirus infection was the most common cause of ILI detected.

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Previous Reports and Updates

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Should you encounter issues in accessing the information contained either on this webpage or within the downloadable full reports please email flu ( or contact the Department of Health switchboard on 02 6289 1555 or 1800 020 103.

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