PPSV23 vaccination for asplenic patients is recommended to be given twice. When should the second dose be administered after the first?

PPSV23 vaccination for asplenic patients is recommended to be given twice. When should the second dose be administered after the first?

• A. 1 year after the first dose
• B. 3 years after the first dose
• C. 5 years after the first dose
• D. 10 years after the first dose

Answer: (C)

When a patient has no spleen, the protection provided by PPSV23 can fade over time, so a booster is recommended to maintain immunity against the pneumococcal serotypes covered by the vaccine. The second dose is given five years after the first to refresh antibody levels and sustain protection, especially during the years when the risk of severe pneumococcal disease remains high. Giving the booster earlier (like after 1 or 3 years) doesn’t provide a meaningful additional long-term benefit, while waiting much longer (such as 10 years) leaves a window of vulnerability. In practice, if the first dose is given before age 65, the second dose should be administered at least five years later, often around or after age 65, to ensure continued protection.

When a patient has no spleen, the protection provided by PPSV23 can fade over time, so a booster is recommended to maintain immunity against the pneumococcal serotypes covered by the vaccine. The second dose is given five years after the first to refresh antibody levels and sustain protection, especially during the years when the risk of severe pneumococcal disease remains high. Giving the booster earlier (like after 1 or 3 years) doesn’t provide a meaningful additional long-term benefit, while waiting much longer (such as 10 years) leaves a window of vulnerability. In practice, if the first dose is given before age 65, the second dose should be administered at least five years later, often around or after age 65, to ensure continued protection.