BCG effects wanes after how many years after vaccination?

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Prepare for the NBME Form 11 Test with targeted flashcards and multiple-choice questions. Each question includes hints and explanations to aid learning. Boost your readiness for exam day!

Multiple Choice

BCG effects wanes after how many years after vaccination?

Explanation:
Protection from BCG is not lifelong; immunity fades over time. The standard teaching used in NBME-style questions is that the protective effect begins to wane about five years after vaccination, so five years is the best choice. If you think about one year, that would imply protection drops almost immediately, which isn’t how BCG behaves. Ten or twenty years would overstate how long the protection lasts, given the observed decline in efficacy over time. In practice, BCG mainly helps prevent severe TB in children, while its protection against adult pulmonary TB is variable and diminishes with time, and boosters aren’t routinely part of standard programs.

Protection from BCG is not lifelong; immunity fades over time. The standard teaching used in NBME-style questions is that the protective effect begins to wane about five years after vaccination, so five years is the best choice. If you think about one year, that would imply protection drops almost immediately, which isn’t how BCG behaves. Ten or twenty years would overstate how long the protection lasts, given the observed decline in efficacy over time. In practice, BCG mainly helps prevent severe TB in children, while its protection against adult pulmonary TB is variable and diminishes with time, and boosters aren’t routinely part of standard programs.

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