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. 2023 Jan 21;9(2):e13103. doi: 10.1016/j.heliyon.2023.e13103

Fig. 1.

Fig. 1

Kaplan-Meier curves showing time to positive RT-PCR tests, where negative RT-PCR tests indicate negativity, for all patients (A) and for patients categorized by previous positive (+) or negative (−) confirmed-COVID-19 before semi-quantitative anti-spike assay by RT-PCR or nucleocapsid assay (B). X-axis is days, y-axis is proportion of cohort who remains negative RT-PCR. Buckets are 0, 1–249, and 250+ representing spike antibody titer. A: All patients segmented by antibody titer level (Ab). B: All patients segmented by both antibody titer level (Ab) and evidence of previous infection through positive PCR test and/or Nucleocapsid (N) antibody test positivity.