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Antibody Decay Slope per baseline COVID infection history. Slopes in antibody levels from Month 2 through Month 9 were compared between subjects with COVID-19 history before vaccination (n = 46), and without COVID-19 history prior to vaccination (n = 249). The slope of antibody decline over time was significantly steeper in the subjects without a history of pre-vaccination COVID-19 infection. *** p < 0.001.
