The antibodies levels showed a trend of rapid decrease in the older group over time.
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Antibody response to second dose of the BNT162b2 mRNA vaccine in the first 12 weeks in South Korea: A prospective longitudinal study.
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Three participants (Participant Number = 35, 60, 69) showed an increasing trend, and only one participant (Participant Number = 60) had a higher antibody level at week 12 (785.5 U/mL) than that at week 1 (675.9 U/mL). 3.6 Time taken to drop by half or less of the initial antibody level To determine when the antibody levels dropped by half or less, the change in pattern of each antibody level was converted into a fold change.