AISR fortnightly report no. 8 – 4 to 17 July 2022
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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 influenza activity data from April 2020 onwards 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. For information on COVID-19 incidence, severity, and distribution in Australia, please refer to COVID-19 epidemiology reports.
- A decrease in influenza-like-illness (ILI) activity in the community has been noted since July 2022.
- In the year to date, there have been 212,573 notifications reported to the National Notifiable Diseases Surveillance System (NNDSS) in Australia, of which 7,312 notifications had a diagnosis date this fortnight.
- The weekly number of notifications of laboratory-confirmed influenza in 2022 has decreased to below the weekly 5 year average this fortnight.
- In the year to date, of the 212,573 notifications of laboratory-confirmed influenza, 246 influenza-associated deaths have been notified to the NNDSS.
- Since commencement of seasonal surveillance in April 2022, there have been 1,581 hospital admissions due to influenza reported across sentinel hospitals sites, of which 6.5% were admitted directly to ICU.
- There is no indication of the potential impact of the 2022 season on society at this time.
- In 2022 to date, people aged 5–9 years, children aged younger than 5 years, and people aged 10–19 years have the highest notification rates.
- To date, 82.6% of notifications of laboratory-confirmed influenza reported to the NNDSS were influenza A, of which 94.4% were influenza A(unsubtyped), 0.8% were influenza A(H1N1), and 4.8% were influenza A(H3N2). Influenza B accounted for 0.1% of notifications,less than 0.1% were A&B co-infections, and 17.3% were untyped.
Vaccine match and effectiveness
- Of the 1,951 samples referred to the WHOCC to date, 97.4% of influenza A(H1N1), 93.2% of influenza A(H3N2), and the 4 influenza B/Victoria samples, were characterised as antigenically similar to the corresponding vaccine components.
- It is too early to assess vaccine match and effectiveness for this season.