Disclaimer: This information is not a substitute for professional medical advice, diagnosis or treatment.
Australia is seeing unusually high summer flu activity, outside of our typical May – September flu season, and much of this is linked to a new variant of influenza A, known as H3N2 subclade K, colloquially coined “Super-K”.
What is “Super-K”?
“Super-K” refers to a mutation of the influenza A (H3N2) virus, officially known as H3N2 subclade K. It’s not an entirely new virus, but a variation of a familiar seasonal flu strain. Super-K is circulating at high levels outside the usual winter peak, and is highly transmissible.
At this stage, health authorities have not found that Super-K causes more severe illness than typical seasonal flu, but its rapid spread has led to record notifications and pressure on health services.
What are the symptoms of Super-K flu?
The symptoms of Super-K infection are very similar to those of regular influenza and include:
- Fever and chills
- Cough and sore throat
- Runny or blocked nose
- Headache
- Muscle and joint aches
- Extreme tiredness and fatigue
Symptoms typically develop 1-3 days after exposure to the virus.
How can I avoid contracting or spreading Super-K?
Maintain personal hygiene habits, washing hands thoroughly and regularly. Avoid close contact with sick people wherever possible. If you’re ill, cover your coughs and sneezes with your elbow or tissues and stay at home if you’re sick. Seasonal influenza vaccines are available and may help lower the likelihood of severe illness for some people, a healthcare professional can help determine whether vaccination is suitable for you.
Note – if you need a medical certificate for time off work, school or uni, speak to a doctor online to request one.
What should I do if I suspect I have Super-K flu?
For most people with mild to moderate symptoms, it is recommended to rest, keep hydrated, and address symptoms with pain relief if appropriate. Avoid going to work, school or visiting vulnerable people.
If your symptoms are severe, worsening, or don’t improve after a few days, it is recommended to speak with a doctor. For those at higher risk of complications, such as older adults, young children, pregnant people or those with chronic health issues, your doctor may prescribe antiviral medications at their discretion.
If you’re experiencing trouble breathing, confusion, persistent pain or pressure in the chest, severe dehydration symptoms such as dizziness or low urine output, seek urgent care – head to your nearest Emergency Department or call 000.
In summary – be vigilant, all year round
The H3N2 subclade K / Super-K flu variant is a reminder that influenza viruses continually evolve, and that vigilance matters. While there’s no evidence it causes more severe illness than other variants, its high transmissibility has made for an unusually strong flu season.
Stay well, and remember, if you need advice or want to discuss symptoms, our doctors are available 24/7. Book an appointment or join the queue to speak to a doctor on demand.