Australian Influenza Surveillance Report

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: 15 October 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 09 - 12 September to 25 September 2015


  • Nationally, influenza activity has continued to decline following a seasonal peak in mid-August.
  • This fortnight, influenza activity was stable or decreasing across most regions in the country, with the exception of the Top End of the Northern Territory where activity continued to increase.
  • This year children aged less than 15 years accounted for one-third of all influenza notifications, this compares with one-quarter of all notifications in 2014. Notification rates have been highest among those aged between 5 and 9 and over 85 years with a secondary peak in those aged 35-44 years.
  • Influenza B continues to be the dominant influenza virus type circulating nationally. Notifications due to both influenza A and B declined nationally this fortnight, however increases were seen in influenza A in the Northern Territory.
  • All national systems that monitor influenza-like illness (ILI) activity continued to report decreasing activity this fortnight following a seasonal peak in mid-August. Western Australia reported unchanged ILI activity when compared with the previous fortnight. Influenza is the primary cause of ILI in the community this fortnight.
  • Hospitalisations with confirmed influenza have continued to decline following a peak in mid-August. The overall rate of influenza cases admitted directly to ICU so far this year was 7%, which is lower than the last three years (10-12%).
  • The seasonal influenza vaccines appear to be a good match for circulating strains with 77% of samples matching the trivalent seasonal vaccine (TIV).
  • The WHO released its recommendation for the composition of the 2016 southern hemisphere seasonal influenza vaccine, which included changes to the A(H3N2) and B vaccine viruses of the trivalent influenza vaccine.

Full Report

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Previous Reports and Updates

Annual Reports

Accessibility Issues

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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