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Itâs not entirely clear why the length of acquired protection varies with different vaccines. A single dose of some vaccines provides lifelong immunity, while others require an additional dose (boosters) in order to maintain immunity.tâs not entirely clear why the length of acquired protection varies with different vaccines. A single dose of some vaccines provides lifelong immunity, while others require an additional dose (boosters) in order to maintain immunity.
Sometimes, vaccine boosters are needed, because the immune response 'memory' weakens over time. For example, anti-tetanus injections may need to be repeated every ten years. Most schools and daycare centres will ask for your baby's health and immunisation record at the time of admission.