- Australian Influenza Surveillance Report
- Previous Reports and Updates
- Annual Reports
- Accessibility Issues
The Australian Influenza Surveillance Report is published on a fortnightly basis during the influenza season, typically between May and October. Influenza activity updates will 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.
- Influenza-like-illness (ILI) activity in the community remains at historically low levels in 2021. While ILI levels increased between January and May 2021, a decrease has been observed since June.
- Notifications of laboratory-confirmed influenza have remained low since April 2020. In the year to date in 2021, there have been 584 notifications to the National Notifiable Diseases Surveillance System (NNDSS) in Australia, of which 30 notifications had a diagnosis date this fortnight.
- There is no indication of the potential severity of the 2021 season at this time.
- In the year to date, of the 584 notifications of laboratory-confirmed influenza, no influenza-associated deaths have been notified to the NNDSS.
- There has been one hospital admission due to influenza reported across sentinel hospitals sites since commencement of surveillance in April 2021.
- Given the low number of laboratory-confirmed influenza notifications, low community ILI activity, and low number of hospitalisations due to influenza at sentinel hospital sites, it is likely there is minimal impact on society due to influenza in 2021 to date.
- In 2021 to date, adults aged 85 years and older, adults aged 60–69 years, children under 5 years of age, and adults aged 75–84 have the highest influenza notification rates.
- To date, 67.3% of notifications of laboratory-confirmed influenza to the NNDSS were influenza A, of which 96.7% were influenza A(unsubtyped), 3.1% were influenza A(H3N2), and 0.3% were influenza A(H1N1)pdm09. Influenza B accounted for 22.4% of notifications, 3.4% were influenza A and B co-infection, 0.3% were influenza C, and 6.5% were untyped.
Vaccine match and effectiveness
- Of the 27 samples referred to the WHOCC to date, the 1 influenza B/Victoria sample and 1 influenza A(H1N1) sample were characterised as antigenically similar to the corresponding vaccine components, while the 25 influenza A(H3N2) samples were characterised as antigenically dissimilar.
- The low case numbers of influenza across all systems in the season to date precludes meaningful analysis to estimate vaccine effectiveness for this season.
- Australian Influenza Surveillance Report No 15 - 11 October to 24 October 2021 (PDF 1193 KB)
- Australian Influenza Surveillance Report No 15 - 11 October to 24 October 2021 (Word 1166 KB)
- Previous Reports - 2021
- Previous Reports - 2020
- Previous Reports - 2019
- Previous Reports - 2018
- Previous Reports - 2017
- Previous Reports - 2016
- Previous Reports and Updates - 2015
- Previous Reports and Updates - 2014
- Previous Reports - 2013
- Previous Reports - 2012
- Previous Reports - 2011
- Previous Reports - 2010
- Previous Reports - 2009
Should you encounter issues in accessing the information contained either on this webpage or within the downloadable full reports please email flu (email@example.com) or contact the Department of Health switchboard on 02 6289 1555 or 1800 020 103.top of page