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Using national surveillance data from South Korea, we found lower male-to-female hepatitis A incidence rate ratios in vaccine-era birth cohorts after single-dose military vaccination. Cohort patterns, multivariable regression, and follow-up of the 1996 birth cohort supported persistence of a population-level protective signal beyond military service across a 10-year observation window.
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Cho et al. (2026) studied this question.
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