If you've ever wondered why you're encouraged to get a flu shot every single year, you're not alone. It might seem repetitive, but there's a very good reason – and in 2025, it's as important as ever to roll up your sleeve.
The flu virus is a master of disguise
Influenza isn't just one virus, it's a constantly evolving family of viruses. One of the main reasons we need a new vaccine each year is because of a process called antigenic drift. Think of it like this: every time the flu virus copies itself, it makes tiny mistakes - sort of like typos when you text quickly. These mistakes lead to small changes in the virus’s surface proteins, called hemagglutinin (H) and neuraminidase (N).
These proteins are what your immune system recognises and fights off. When they change, even slightly, your body might not recognize the virus anymore. That means you can get sick again, even if you've had the flu before or were vaccinated last year.
A unique, predictable pattern – bigger seasons every other year
Flu seasons often follow a biennial pattern, meaning every second year tends to bring a different, often larger wave of infections. This year, we’re seeing signs that suggest 2025 could be a big one. When people haven’t been exposed to the flu for a while, their immunity can fade. Combine that with the ever-changing virus, and the result is more people getting sick.
Bigger seasons also tend to start earlier and that’s exactly what’s happening now.
In the Sunshine Coast region, flu cases in May 2025 are already more than four times higher than the five-year average. This early spike could be a sign of a more severe and widespread flu season ahead.
Don’t wait – get vaccinated now
The flu shot is the best way to protect yourself and those around you. Because of how much the virus changes from year to year, last year’s vaccine won’t cut it this year. Getting vaccinated now means you’ll be protected as flu activity continues to ramp up.
Other ways to stay healthy
In addition to getting vaccinated, remember to practice good hygiene to help stop the spread:
- Stay home if you’re feeling sick
- Wash your hands regularly with soap and water or use hand sanitiser
- Cough or sneeze into your elbow or a tissue
- Dispose of used tissues properly and wash your hands afterwards
- Keep a safe distance (about 1.5 metres) from anyone who’s coughing or sneezing
- Disinfect frequently-touched surfaces
- Avoid sharing cups, utensils, lip balm, or toys
The bottom line
Each flu season is a bit like facing a slightly different opponent. By getting vaccinated each year, you give your immune system the best chance to recognise and fight the latest version of the virus. This year’s early surge in cases is a clear warning: now is the time to protect yourself and your community.