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Why You Need a Flu Vaccine Every Year

Key Information

If you had a flu jab last year, you may wonder why you need another one this year.
Think of the flu vaccine as a software update for your immune system.
You need the latest version each year to stay protected against new flu strains.

The main reason you need a new vaccine each year is that the flu virus is constantly changing.

Think of the flu virus like a master of disguise. The version that circulated last winter may be different from the one expected this year.

Last year’s vaccine trained your immune system to spot last year’s disguise, but it may not recognise the new one as effectively.

Scientists around the world constantly track which flu strains are circulating.

Based on this information, a new updated vaccine is developed each year to match the flu viruses expected to be most common.

The jab you receive each autumn is designed to protect you against the specific flu viruses likely to circulate that winter.

Your immunity from last year’s flu jab naturally reduces over time.

Having the vaccine every year gives your immune system an important boost and helps keep your protection strong.

Getting your annual flu jab is the best way to protect yourself and those around you from becoming seriously unwell with flu.

Please look out for your invitation from the practice. If you receive an invite, please attend your appointment or visit your local pharmacist.

Last reviewed: 20 April 2026
Next review due: 20 April 2029