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: 09 November 2016

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 11 - 15 October - 28 October 2016


  • Nationally, influenza activity is returning to baseline levels, however seasonal activity persists in some regions.
  • Nationally, and in most jurisdictions, the seasonal peak of laboratory confirmed notifications of influenza occurred in the fortnight ending 2 September 2016 (week 34 and 35). Notifications peaked two weeks later in South Australia and four weeks later in the Northern Territory. Notifications have decreased this reporting fortnight, however are higher than at the same time in recent years. This is likely driven by a later season onset and persistent regional activity.
  • Throughout the season national indicators of influenza-like illness (ILI) in the community remained on the lower range of activity reported in previous years until late September, when they were at the higher end of the historical range. National indicators of ILI in the community continued to decline this fortnight and have reached baseline levels. Rhinovirus was the primary cause of ILI presentations to sentinel general practitioners this fortnight.
  • The 2016 season was characterised by the dominant circulation of influenza A. Early interseasonal activity was driven by influenza A(H1N1)pdm09, with influenza A(H3N2) predominating throughout the season from July.
  • Notification rates this year to date have been highest in adults aged 75 years or older, with a secondary, smaller peak in the very young, aged less than 5 years. This is consistent with influenza A(H3N2) being typically more prevalent in older age groups.
  • There were fewer admissions with confirmed influenza to sentinel hospitals this year than in the past two years. The overall proportion of patients admitted directly to Intensive Care Units (ICUs) was higher than last year, but consistent with a season of moderate severity. Aboriginal and Torres Strait Islander Peoples and pregnant women were identified at greater risk of being admitted to ICU than other admitted patients this season.
  • To date, the seasonal influenza vaccines appear to be a good match for circulating virus strains.
  • This will be the Australian Influenza Surveillance Report for 2016, unless unusual activity becomes apparent over the summer months.

Full Report

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Previous Reports and Updates

Annual Reports

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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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