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. 2021 May 12;1(2):100011. doi: 10.1016/j.crmeth.2021.100011

Figure 3.

Figure 3

Agglutination assay distinguished COVID-19+ from COVID-19− samples

(A and B) Comparison of S-RBD (A) and N antibody (B) responses between COVID-19+ (n = 169), COVID-19− (n = 121), and pre-COVID-19 (n = 100) samples determined by the aggregation assay.

(C and D) The strength of the S-RBD (C) and N antibody (D) response in the COVID-19+ (n = 169) plasma samples could be determined semi-quantitatively by the aggregation score (1–4 denotes weak to strong antibody response). Statistical analyses were performed using unpaired Student's t test with Welch's correction (p values shown on graph). Error bars represent standard deviation.