AISR fortnightly report no. 3 – 20 May to 2 June 2019

The fortnightly Australian Influenza Surveillance Report (AISR) includes information about influenza activity, severity, impact, at-risk populations, virology, and vaccine match and effectiveness. It also gives year-to-date data and comparisons.


AISR fortnightly report no. 3 – 20 May to 2 June 2019

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The Australian Influenza Surveillance Report (AISR) is compiled from several data sources 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
  • ILI-related community level surveys
  • sentinel laboratory testing results.

The AISR is published fortnightly during the influenza season, typically between May and October. Influenza activity updates may be published outside of the seasonal period.



Currently, influenza and influenza-like illness (ILI) activity are high for this time of year compared to previous years. At the national level, notifications of laboratory-confirmed influenza have increased in the past fortnight. The number of laboratory-confirmed notifications of influenza reported to the NNDSS in the 2019 year-to-date are greater when compared to the same periods in 2017 and 2018, however, this is due to heightened interseasonal activity.


There is no indication of the potential severity of the 2019 season at this time.


There is no indication of the potential impact on society of the 2019 season at this time.


In the year to date and in the past fortnight, the majority of confirmed influenza cases reported nationally were influenza A (81%). Where subtyping data were available, influenza A(H3N2) was the dominant influenza A subtype in the past fortnight, however, the proportion of influenza B has been steadily increasing in a number of jurisdictions since late April.

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