Influenza Activity Surveillance & Graph 2025
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This report provides a summary of influenza surveillance data collected from around Australia and New Zealand. Regional reporting in some areas ceases when influenza activity is low (out of season). Please note that many people do not get tested for influenza and that there may also be some delays in reporting confirmed influenza cases.
Therefore data presented here may be underestimating influenza activity.
National Notifiable Diseases Surveillance System (NNDSS)
Update for 12 May 2025
It is important to note that data reported from the various influenza surveillance systems may not represent an accurate reflection of influenza activity. There may be some delays in the reporting systems. Also, many who become unwell with influenza-like symptoms do not present to their doctor and are not tested for influenza.
Results should be interpreted with caution.
National notification data (NNDSS):
There have been 74,999 notifications of laboratory confirmed influenza reported to the NNDSS in the year to 12 May 2025.
Total notifications from each state and territory are as follows:
| ACT | 896 |
| NSW | 28,858 |
| NT | 1,464 |
| QLD | 17,267 |
| SA | 4,127 |
| TAS | 1,011 |
| VIC | 15,426 |
| WA | 5,950 |
For more national data: National Notifiable Diseases Surveillance System (NNDSS)
Australian Influenza Surveillance Report
https://nindss.health.gov.au/pbi-dashboard/
National Vaccination Coverage Rates
Influenza vaccination is recommended for all Australians aged 6 months and older. Flu vaccination reporting to the Australian Immunisation Register (AIR) is mandatory allowing coverage rates to be monitored.
For more information visit NCIRS here
Australian Capital Territory
Publication of the Weekly Respiratory Illness Report will pause from Friday 24 January 2025, re-commencing in the autumn/winter months of the year, when the ACT is likely to observe an increase in respiratory illnesses again.
Reporting period Friday 17 January 2025 to Thursday 23 January 2025 inclusive
Total influenza cases:
- Current reporting period: 29
- 2025 total: 131
- Rate per 100,000 for reporting period: 6.1
New South Wales
Weekly influenza information is available in the COVID-19 weekly surveillance report.
Week ending 3 May 2025
Note that many people with influenza in the community do not get tested for influenza, and that there may be delays in the reporting of confirmed influenza cases. Therefore data presented here may tend to under-represent current influenza activity in NSW.
Summary:
- Influenza activity is at a low level.
- In the past week there was a increase of 5.6% in influenza notifications.
For more information: NSW Health – Respiratory Surveillance Reports
Queensland
Data extracted on 6 May 2025
- 63 people were in hospital with Influenza, 39 (62%) were aged 65 years and above.
- 883 people diagnosed in the last week, 160 (18%) were aged 65 years or more.
South Australia
Update for the week ending at 3 May 2025:
Count of influenza notifications in the week ending 3 May 2025: 245
For more information: Communicable Diseases Control Branch
Tasmania
Week ending 27 April 2025
Summary
- Influenza activity remains low. Elevated inter-seasonal activity observed earlier this year has declined in recent weeks.
Influenza notifications for week ending 27 April : 48
2025 YTD influenza notifications: 908
For more information: https://www.health.tas.gov.au/publications/respiratory-surveillance-report
Victoria
12 May 2025
Victoria, local public health areas and local government areas surveillance summary report
Total influenza cases (YTD): 15,541
For more information: Victorian Infectious Diseases Reference Laboratory or Victorian State Health Department
Western Australia
Week ending 27 April 2025
Influenza and Influenza-like Illnesses (ILI) Summary:
- In the past week, the number of influenza cases notified to the Department of Health decreased by 24% to 213 cases and remained below the seasonal threshold.
- The influenza PCR test positivity at PathWest increased to 4.7% (47 detections) in the past week.
- PathWest reported 47 influenza detections in the past week, which included 30 A/H1, 3 A/H3, 5 influenza A not subtyped, and 9 influenza B.
For more information: WA Virus WAtch
FluTracking and New Zealand
FluTracking
FluTracking is an online health surveillance system which aims to detect epidemics of influenza. It is a joint initiative of The University of Newcastle, Hunter New England Area Health Service (NSW Health) and Hunter Medical Research Institute. Participation is voluntary and involves the completion of a weekly online survey during the influenza season. Data are collected on basic demographics, symptoms of ILI and absenteeism.
Reporting week Monday 28 April 2025 – Sunday 04 May 2025
(Data used in this report received up to 09:00 AM, Thursday 08 May)
Summary:
- Respiratory illness levels have increased this week
- 46,173 participants this week
Respiratory illness activity* (age standardised):
*Respiratory illness activity is defined as fever & cough for this report
1.1% this week and 0.9% last week
Respiratory illness activity among Aboriginal and Torres Strait Islander participants:
1.6% this week and 0.7% last week
Respiratory illness severity:
Sought medical advice for fever and cough symptoms: 23% (79/343) this week compared to 28.1% last week.
New Zealand
4 May 2025
Summary
The national rate of ILI-related calls to Healthline has decreased in the week ending 4 May. Influenza detections in community and hospital settings remain at low levels.
One respiratory illness outbreak was reported in the week ending 4 May 2025. The outbreak was in an aged residential care (ARC) facility in MidCentral district.
The all-cause Severe Acute Respiratory Infection (SARI) hospitalisation rate in the Auckland region decreased in the week ending 4 May and is below the baseline seasonal threshold. RSV, followed by influenza (A and B), were the most frequently detected viruses among SARI patients. Influenza A/H1 is the influenza strain which has predominated in New Zealand so far this year.
The influenza-positive SARI hospitalisation decreased slightly in the week ending 4 May and is now slightly below the baseline seasonal threshold.
The SARS-CoV-2-positive SARI hospitalisation rate remains low and is slightly lower than this time in previous years. This does not
necessarily reflect the trend in all COVID-19 related hospital admissions monitored by Health New Zealand, as different definitions for admission are used: https://tewhatuora.shinyapps.io/covid19/
Note that the results presented are based on data available as at 8 May 2025. These may be updated as more data become available and should be regarded as provisional.
Flu Tracking: For more information, or to enroll: Flu Tracking
New Zealand reporting: For more information see here