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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.
Are booster shots for hepatitis B necessary, and if so, how often should they be given? F. Noorani, MD. Neither the Advisory Committee for Immunization Practices (ACIP) in the United States nor the European Consensus Group on Hepatitis B Immunity recommends booster doses for most children and adults.