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. 2020 Sep 16;60(12):2938–2951. doi: 10.1111/trf.16065

FIGURE 2.

FIGURE 2

Distribution of 271 convalescent donors, based on nasopharyngeal swab (NF swab, n = 139) or peripheral blood RT‐PCR (PB, n = 121), and neutralizing antibody tests (n = 250). Eleven (11) donors did not collect RT‐PCR2. There were 107 donors who were tested by both PB and swab RT‐PCR2, whose cycle threshold (mean ± SD) was, respectively, 37 ± 1.3 × 36 ± 1.8 (P = .34, Wilcoxon test). The final percentage of accepted donors according to the combination of RT‐PCR2 or 3 and neutralizing antibody titer of 80 or higher or 160 or higher is 49.1% (95% CI, 43.0%‐55.2%) or 41.3% (95% CI, 35.4%‐47.4%), respectively (middle box)