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Change in SARS-CoV-2 S antibody levels (BAU/mL) over time in HCs (A) and LuTRs (B). Upper level of quantification: 2500 BAU/mL. The horizontal line indicates the cutoff for seroconversion. Circles represent individual antibody levels. Participants with a history of COVID-19, prior to immunization, are presented as triangles. Darker lines indicate overlapping points. (**, *** significant).
