The 6 Immunity Non-Negotiables
Why this guide exists — and how to use it
Most vaccine conversations focus on children. But immunity needs maintenance throughout adult life, and several of the most valuable adult vaccines are widely under-used simply because nobody reminds people they exist or that they're still eligible. This guide covers how immunity actually works, how vaccines work with it rather than against it, and the specific adult immunisation schedule most people are quietly behind on.
This guide synthesises the peer-reviewed immunology and vaccinology literature into one complete, readable document — drawing on Andrew Pollard's comprehensive review of vaccine science (Oxford), Janko Nikolich-Žugich's research on immune ageing (University of Arizona), and large-scale meta-analyses (studies that statistically combine the results of many separate studies to reach a more reliable conclusion than any single one) on vaccine safety. Where a claim touches vaccine safety specifically, this guide cites only peer-reviewed, large-sample research or major public health bodies — no anecdote, no single small study standing in for a body of evidence. Read it once end-to-end, then return to sections as reference.
The 6 Non-Negotiables
| # | Non-Negotiable | Why it matters |
|---|---|---|
| 1 | Adult immunity needs maintenance, not just a childhood schedule | Protection against several diseases — tetanus, pertussis — wanes over years and needs boosting. |
| 2 | Getting a vaccine you're eligible for protects others, not just you | Herd immunity is a real, population-level effect that protects people who can't be vaccinated. |
| 3 | The vaccine-autism link has been closed by the evidence, definitively | A meta-analysis spanning over 1.2 million children found no association — one of the most thoroughly studied questions in modern medicine. |
| 4 | Shingles risk isn't cancelled by having had chickenpox | The shingles vaccine is a separate, distinct recommendation from childhood chickenpox history. |
| 5 | Immune function declines with age | Older adults respond less robustly to both infections and vaccines — which is why several vaccines have specific older-adult recommendations, not lower priority. |
| 6 | Travel vaccines need weeks of lead time, not days | Several require multiple doses or take time to become effective — plan 4–6 weeks ahead of departure. |