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. 2021 Mar 10;16(3):e0248348. doi: 10.1371/journal.pone.0248348

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Fig 7 — Spearman correlation of ID₅₀ (A and C) or ID₈₀ (B and D) values comparing titers generated in the present study to (A and B) the focused concordance samples and (C and D) an NIBSC reference standards with reported titers generated by a plaque reduction neutralization (PRNT) assay.