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. 2020 Nov 20;99(3):115273. doi: 10.1016/j.diagmicrobio.2020.115273

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Fig. 1 — Neutralization assay (NA) was performed based on SARS-CoV-2 pseudotyped viral particles (SARS2pp). (A) Neutralization percentage of serum samples (n = 100) that were diluted 1:40 and run in SARS2pp NA. Dotted line shows 50% neutralization activity. (B) Few serum samples (n = 20) were further tested in SARS2pp NA in a 3-fold serial dilution to present the titre of neutralizing antibodies as 50% inhibitory concentration (IC50).