There's a host of different reasons that you might need an immunisation or vaccination. If you work in an industry that could potentially expose you to infectious diseases like healthcare, teaching, or emergency services, you'll need up-to-date immunisations to protect yourself and others.
If you're planning on travelling, you may need vaccinations for diseases like cholera, meningococcal, and rabies. Talk to your GP about where you're planning on going, and what you'll need to be treated for before leaving.
Even if you don't work in an at-risk industry and aren't planning on travelling, you may want to protect yourself against the flu with an annual vaccination. Oh, and AIA Vitality members can earn 1,000 AIA Vitality points each year simply by providing proof of attendance for a flu vaccination.