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Percentage of nonreactive healthcare workers to the first vaccine dose in males (blue line) and females (red line) and different age groups. An increased percentage of nonreactive subjects was observed from 0.4% to 3.3% and 7.1% in <40 yr, 40–60 yr, and >60 yr, respectively, in males, and in females from 0.6% to 1.3% and 3.0% in <48 yr, 48–52 yr, and >52 yr, respectively.
