Influenza in Australia before, during and after the COVID-19 pandemic
Ian G. Barr A B *A
B
Prof. Ian Barr is currently the deputy director of the WHO Collaborating Centre for Reference and Research on Influenza, which was designated in 1992 (one of five globally). The Centre plays a key role in the regional surveillance of human and zoonotic influenza viruses as well as having an active research program. Ian has over 35 years’ experience with academic and commercial organisations, including over 24 years at the Centre. He has authored or co-authored over 300 scientific publications including more than 250 peer-reviewed journal articles, reviews and editorials on various aspects of influenza and respiratory syncytial virus. |
Abstract
Influenza, like many of the other human respiratory diseases has rebounded after virtually no circulation in 2020–2021 during the COVID-19 pandemic. The three influenza seasons since the pandemic have all started earlier than the average season pre-COVID-19 and all have been significant seasons. The 2024 season had the highest number of laboratory confirmed influenza cases since records have been kept; however, the number of deaths associated with influenza was lower than in 2017 and 2019. The length of the influenza seasons has also varied since the pandemic, with 2022 being a short season and the 2023 and 2024 seasons being more typical seasons, lasting for several months. Although a number of different influenza vaccines are available for all persons 6 months of age and older and in 2024 were free in some states and for other at-risk groups, vaccination rates have been dropping. For example, vaccine uptake in 2024 for the age group 6 months to <5 years was only 26% and was only 61% for those 65 years and over. Greater awareness of the complications from influenza infection are needed along with increased vaccination rates if we are to ameliorate the impact of this constant autumn–winter visitor.
Keywords: COVID-19, Influenza, seasonality, vaccination.
Prof. Ian Barr is currently the deputy director of the WHO Collaborating Centre for Reference and Research on Influenza, which was designated in 1992 (one of five globally). The Centre plays a key role in the regional surveillance of human and zoonotic influenza viruses as well as having an active research program. Ian has over 35 years’ experience with academic and commercial organisations, including over 24 years at the Centre. He has authored or co-authored over 300 scientific publications including more than 250 peer-reviewed journal articles, reviews and editorials on various aspects of influenza and respiratory syncytial virus. |
References
1 Sullivan SG et al. (2020) Where has all the influenza gone? The impact of COVID-19 on the circulation of influenza and other respiratory viruses, Australia, March to September 2020. Euro Surveill 25, 2001847.
| Crossref | Google Scholar | PubMed |
2 Williams TC et al. (2021) Transmission of paediatric respiratory syncytial virus and influenza in the wake of the COVID-19 pandemic. Euro Surveill 26, 2100186.
| Crossref | Google Scholar | PubMed |
3 Australian Government Department of Health and Aged Care (2024) Australian Respiratory Surveillance Report 9 – 15 July to 28 July 2024. Commonwealth of Australia. https://www.health.gov.au/resources/publications/australian-respiratory-surveillance-report-9-15-july-to-28-july-2024?language=en
4 Australian Government Department of Health and Aged Care (2024) COVID-19 rapid antigen self-tests that are approved in Australia. Commonwealth of Australia. https://www.tga.gov.au/products/covid-19/covid-19-tests/covid-19-rapid-antigen-self-tests-home-use/covid-19-rapid-antigen-self-tests-are-approved-australia (accessed 28 September 2024)
5 Monash Health (2020) FluCAN (The Influenza Complications Alert Network). https://monashhealth.org/services/monash-infectious-diseases/research/influenza-research/flucan-influenza-surveillance-2/ (accessed 11 August 2024)
6 Centers for Disease Control and Prevention (2024) FluView: a weekly influenza surveillance report prepared by the Influenza Division. CDC. https://www.cdc.gov/fluview/index.html (accessed 11 August 2024)
7 Australian Government Department of Health and Aged Care (2024) Influenza (flu) immunisation data – 1 March to 4 August – 2021–2024. Commonwealth of Australia. https://www.health.gov.au/resources/publications/influenza-flu-immunisation-data-1-march-to-4-august-2021-2024?language=en (accessed 4 August 2024)
8 Price OH et al. (2019) Using routine testing data to understand circulation patterns of influenza A, respiratory syncytial virus and other respiratory viruses in Victoria, Australia. Epidemiol Infect 147, e221.
| Crossref | Google Scholar | PubMed |
9 Laurie KL et al. (2015) Interval between infections and viral hierarchy are determinants of viral interference following influenza virus infection in a ferret model. J Infect Dis 212, 1701-1710.
| Crossref | Google Scholar | PubMed |
10 Moderna, Inc. (2024) Moderna announces positive Phase 3 data for combination vaccine against influenza and COVID-19. June 10, 2024. https://investors.modernatx.com/news/news-details/2024/Moderna-Announces-Positive-Phase-3-Data-for-Combination-Vaccine-Against-Influenza-and-COVID-19-/default.aspx (accessed 11 August 2024)
11 Sanofi (2024) Press Release: Sanofi and Novavax announce co-exclusive licensing agreement to co-commercialize COVID-19 vaccine and develop novel flu-COVID-19 combination vaccines. May 10, 2024. https://www.sanofi.com/en/media-room/press-releases/2024/2024-05-10-06-00-00-2879379 (accessed 11 August 2024)
12 Shrestha AC et al. (2024Sep) Influenza epidemiology and vaccine effectiveness following funded influenza vaccine in Queensland, Australia, 2022. Influenza Other Respir Viruses 18, e70007.
| Crossref | Google Scholar | PubMed |
13 Australian Government Department of Health and Aged Care (2024) COVID-19 vaccine program. Commonwealth of Australia. https://www.health.gov.au/sites/default/files/2024-07/covid-19-vaccine-rollout-update-12-july-2024.pdf (accessed 4 August 2024)
14 National Centre for Immunisation Research and Surveillance (2024) Influenza vaccination cumulative % coverage by age group - all people. NCIRS. https://ncirs.org.au/influenza-vaccination-coverage-data/all-people-2020-2024-ytd (accessed 11 August 2024)
15 Caini S et al. (2024) Probable extinction of influenza B/Yamagata and its public health implications: a systematic literature review and assessment of global surveillance databases. Lancet Microbe 5, 100851.
| Crossref | Google Scholar | PubMed |
16 Australian Government Department of Health and Aged Care (2024) Australian Respiratory Surveillance Report 13 – 9 September to 22 September 2024. Commonwealth of Australia. https://www.health.gov.au/resources/publications/australian-respiratory-surveillance-report-13-9-september-to-22-september-2024?language=en
