AISR fortnightly report no. 5 – 17 June to 30 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. However, this activity is not unusual when compared to the range of activity during an average influenza season. At the national level, notifications of laboratory-confirmed influenza have increased in the past fortnight; however, some jurisdictions have experienced a notable decrease in activity.
Clinical severity for the season to date, as measured through the proportion of patients admitted directly to ICU, and deaths attributed to influenza, is low.
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 (84% and 75% respectively). The proportion of influenza B nationally has been increasing each week since early May, and particularly in the last month.