As the holiday season approaches, health authorities are raising concerns over an unusual increase in influenza cases, primarily driven by the influenza A(H3N2) virus, particularly a new subclade known as subclade K. While there is no evidence of increased severity, the surge in infections could strain healthcare services and heighten the risk of serious illness among vulnerable groups, including older adults, young children, pregnant or breastfeeding individuals, Aboriginal and Torres Strait Islander communities, and those with chronic medical conditions.
The Australian Health Protection Principal Committee (AHPC) has issued guidance to mitigate the impact of this influenza uptick. They recommend that individuals experiencing flu-like symptoms stay home, avoid visiting high-risk individuals and settings such as aged care homes, and consider wearing masks if they need to leave their homes.
Vaccination and Preventive Measures
With the flu season coinciding with holiday travel, the AHPC underscores the importance of vaccination. Those who have not yet received an influenza vaccine in 2025 are encouraged to do so, particularly if they are over 65, have young children, identify as Aboriginal or Torres Strait Islander, or have chronic health issues. The annual flu vaccine is advised for everyone over six months of age.
Travelers heading to the Northern Hemisphere in the coming weeks should consider getting vaccinated before departure. For individuals at risk of severe illness from influenza, consulting with healthcare providers to establish a plan for early testing and access to antiviral medication is recommended.
Guidance for Healthcare Providers
Healthcare professionals and aged care providers are urged to remain vigilant for potential influenza outbreaks in institutional settings, such as residential aged care homes, correctional centers, and hospitals. They should adhere to local outbreak protocols and report any occurrences to public health units.
Facilities are advised to reinforce infection prevention measures, ensure outbreak action plans are in place, and encourage vaccination among unvaccinated residents and staff. This period also presents an opportunity to assess the need for COVID-19 vaccinations among aged care residents.
Antiviral Treatment and Outbreak Management
Antiviral medications like oseltamivir remain effective against the circulating influenza A(H3N2) subclade K virus. Early treatment is recommended for high-risk patients to reduce symptom duration and infectiousness. Oseltamivir may also be used for outbreak prophylaxis, following guidance from local public health units.
“Antiviral medication, like oseltamivir, remains effective against the currently circulating influenza A(H3N2) subclade K virus, and early treatment is recommended for high-risk patients.”
Monitoring and Future Updates
The AHPC will continue to monitor influenza infection rates, vaccine effectiveness, and the impact on health services, updating their guidance as necessary. This proactive approach aims to safeguard public health during a season traditionally associated with increased social interaction and travel.
As the situation evolves, individuals and healthcare providers alike are encouraged to stay informed and adhere to recommended preventive measures to mitigate the spread of influenza during the holiday season.
