Australian Influenza Surveillance Report No 5 - 18 July to 31 July 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: 10 August 2015

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, with updates also provided during the season. A more in-depth end-of-season report is also published in Communicable Diseases Intelligence journal.

Australian Influenza Surveillance Report No 05 - 18 July to 31 July 2015


  • Influenza activity continued to increase nationally this fortnight. Across jurisdictions activity varied, suggesting that the season may be close to peaking in some areas but may continue to increase in others.
  • The 2015 seasonal rise in notifications appears to have started nationally in early June.
  • Influenza notification rates have been highest among those aged over 85 years with secondary peaks in those aged 5-9 and 40-44 years.
  • Influenza B continues to be the dominant influenza virus type nationally, comprising two thirds of all notifications.
  • All systems that monitor influenza-like illness (ILI) activity are reporting increasing activity while remaining within the range of previous seasons. Influenza, RSV and Rhinovirus are all contributing to increasing ILI in the community this fortnight.
  • Hospitalisations with confirmed influenza declined in the past fortnight. While less severe overall, presentations appear to be more severe in children this year, with 16% of children presenting to sentinel hospitals with influenza admitted directly to ICU compared with 6% of adults.
  • The seasonal influenza vaccines appear to be a good match for circulating strains.

Full Report

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Previous Reports and Updates

Annual Reports

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