Australian Influenza Surveillance Report No. 4 - 4 July to 17 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: 28 July 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 04 - 4 July to 17 July 2015


  • Most surveillance systems indicate that the influenza season is well underway. It is not an unusual influenza season thus far.
  • All States and Territories, with the exception of the Northern Territory, have shown increases in influenza activity in recent weeks.
  • Influenza notification rates have been highest among those aged over 85 years with a secondary peaks in those aged 5-9 and 40-44 years.
  • In the last fortnight, influenza B has been the dominant influenza virus type, comprising two thirds of all notifications.
  • Hospitalisations with confirmed influenza have increased in recent weeks in line with the seasonal increase in activity. Presentations to hospital appear to be less severe in adults, with the proportion of adult patients admitted to ICU less than the proportion reported in previous years.
  • All systems that monitor influenza-like illness (ILI) activity are reporting activity within the range observed in recent seasons. ILI in the community continues to be driven by other non-influenza respiratory viruses, in particular RSV and Rhinovirus.
  • 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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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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