Australian influenza report 2013— 03 August to 16 August 2013 (#05/2013)

The Australian Influenza Report is compiled from a number of data sources, including laboratory-confirmed notifications to NNDSS, sentinel influenza-like illness reporting from General Practitioners and Emergency Departments, workplace absenteeism, and laboratory testing. Reports are produced fortnightly from May to October. A more in-depth end-of-season report is also published in Communicable Diseases Intelligence.

Page last updated: 29 August 2013

Current Report Summary

  • Although overall influenza activity remains relatively low compared to 2011 and 2012, the steady seasonal increase has continued.
  • Since the beginning of the year there have been 10,702 laboratory confirmed cases of influenza reported. Over the past fortnight there were 2,688 notifications, with almost a third reported from New South Wales (919).
  • Nationally, whilst influenza A remains the predominant influenza virus type, the proportion of influenza B continues to be higher than recent seasons. During the 2012 season there were very few notifications of influenza A(H1N1) pdm09. So far in 2013 whilst the majority of influenza A reports are unsubtyped, more than 10% of overall notifications have been reported as influenza A(H1N1) pdm09.
  • Across jurisdictions the distribution of influenza types and subtypes is variable. In Victoria there is a predominance of influenza type B, whereas most other states are reporting a predominance of influenza type A, with NSW reporting mostly A(H1N1)pdm09 and Western Australia mostly A(H3N2).
  • Over the past few weeks there has been a continued seasonal increase in influenza associated hospitalisations. Around 10% of influenza cases have been admitted directly to ICU. The age distribution of hospital admissions shows peaks in the 0-9 and over 60 years age groups typical of seasons dominated by A(H1N1).
  • The WHO has reported that influenza activity in the northern hemisphere temperate zones remains at inter-seasonal levels. In the temperate countries of South America and Southern Africa, influenza transmission peaked in late June and was primarily associated with influenza A(H1N1)pdm09.

Full Report

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