AISR fortnightly report no. 2 – 20 April to 3 May 2020
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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.
It is important to note that due to the COVID-19 epidemic in Australia, data reported from the various influenza surveillance systems may not represent an accurate reflection of influenza activity. Results should be interpreted with caution, especially where comparisons are made to previous influenza seasons. Interpretation of 2020 influenza activity data should take into account, but are not limited to, the impact of social distancing measures, likely changes in health seeking behaviour of the community including access to alternative streams of acute respiratory infection specific health services, and focussed testing for COVID-19 response activities. Current COVID-19 related public health measures and the community’s adherence to public health messages are also likely having an effect on transmission of acute respiratory infections, including influenza.
Following a high start to the 2020 interseasonal period, currently, influenza and influenza-like illness (ILI) activity are lower than average across all systems for this time of year. At the national level, notifications of laboratory-confirmed influenza have substantially decreased since mid-March and remain low.
There is no indication of the potential impact on society of the 2020 season at this time.
There is no indication of the potential severity of the 2020 season at this time. In the year to date, of the 20,323 notifications of laboratory confirmed influenza, 35 (0.17%) laboratory-confirmed influenza-associated deaths have been notified to the National Notifiable Diseases Surveillance System (NNDSS).
In the year to date, the majority of nationally reported laboratory-confirmed influenza cases were influenza A (87.9%). The proportion of cases attributed to influenza B (28%) has increased in the past fortnight, compared to previous fortnights (range: 10%-24%).
Vaccine match and effectiveness
It is too early in the season to assess vaccine match and effectiveness.