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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.
You need this vaccine if you have a specific risk factor for hepatitis B virus infection* or simply. want to be protected from this disease. The vaccine is given in 3 doses, usually over 6 months. Yes! You are at increased risk for Hib disease because you do not have a functioning spleen.