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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 vaccination provides protection for 95-100% of those who have it. This protection lasts at least 10 years and may even be life-long. Booster doses of the yellow fever vaccine used to be recommended every 10 years for everyone planning another visit to an area where the infection is found. However, experts working for the World Health Organization (WHO) recently suggested that booster doses may not be necessary.