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Anti-spike antibody levels of participants without a history of SARS-CoV-2 infection at 94 to 109 days after the second dose of the BNT162b2 vaccine according to sex and age. The horizontal lines indicate the median antibody levels of each group (males: 2043 AU/mL; females: 2546 AU/mL). The perpendicular dotted lines indicate the median age of each group (males: 41 years; females: 38 years).
