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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.
vaccine (DTaP/IPV/Hib/Hep B) at 2, 4, and 6 months of age (given by GPs). â¢ A booster dose at 4-5 years as DTaP/IPV (given by HSE vaccination teams in school. or by GPs in some areas). â¢ A second booster between 11 and 14 years as Tdap (given to 1 st year students in.