Australian influenza report 2013—06 to 19 July 2013 (#03/2013)

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: 05 August 2013

Current Report Summary

  • Although overall influenza activity remains relatively low, there has been a steady increase nationally. With most jurisdictions also reporting increases. This is indicative of the onset of the 2013 winter influenza season.
  • Since the beginning of the year there have been 6,333 laboratory confirmed cases of influenza reported. This fortnight there was an almost 50% increase in the number of notifications reported to the NNDSS compared with the previous fortnight.
  • Nationally, whilst influenza A remains the predominant influenza virus type (57%), the proportion of influenza B notifications continues to increase. 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.
  • Over the past few weeks there have been early seasonal increases in influenza associated hospitalisations.
  • The WHO has reported that influenza activity in the northern hemisphere temperate zones remains at inter-seasonal levels. Across most regions of tropical Asia, activity has decreased, however in India and Viet Nam influenza activity associated with influenza A is relatively high.
  • The United States has reported further cases of the influenza A(H3N2) variant virus that were associated with fair attendance and contact with swine. The virus detected is the same as the variant viruses detected during the 2012 multi-state outbreak, which was also associated with swine exposure at agricultural fairs.
  • The WHO has reported on an additional laboratory-confirmed case of human infection with avian influenza A(H7N9) virus in China. This is the first new confirmed case since 29 May 2013. To date, the WHO has been informed of a total of 134 laboratory-confirmed cases, including 43 deaths. So far, there is no evidence of sustainable human-to-human transmission.

Full Report

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