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| DURATION OF PROTECTION AFTER |
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A VACCINATION |
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| n | Persistence of
antibody |
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| • | At least 5-8
years among adults and children |
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| • | Efficacy |
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| u | No cases in
vaccinated children at 5-6 years of |
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| follow-up |
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| n | Mathematical
models of antibody decline suggest |
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| protective
antibody levels persist for at least 20 |
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| years |
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| n | Other
mechanisms, such as cellular memory, may |
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| contribute |
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