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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.
The first three doses are given as part of a 5-in-1 vaccine for babies at 2, 3 and 4 months old. A booster dose is given as part of the 4-in-1 pre-school booster at around 4 years old. A final booster is given as part of the 3-in-1 teenage booster between 13 and 18 years old.