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Age-specific proportions of serum samples reactive for anti-HBs but non-reactive for anti-HBc antibodies (A), and non-reactive for either anti-HBs or anti-HBc (B). Values significantly lower (Panel A) or higher (Panel B) than the national average values (two-tailed p < 0.05, Chi-square with Yates’ correction) are marked with an asterisk (*).
