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Frequency distribution of IgGSP versus days after the second dose of COVID-19 vaccines in LT recipients (a) BNT162b2 (Pfizer-BioNTech); (b) mRNA-1273 (Moderna). DA2D, days after the second dose of COVID-19 vaccines; prior-infected, pink-filled circle (Figure 1a); broken red and blue lines, IgGSP serology assay’s manufacturer-recommended positive cut-off value.
