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. 2021 Dec 29;10(3):e583. doi: 10.1002/iid3.583

Figure 3.

Figure 3

Strong correlation between SARS‐CoV‐2‐specific IgG and IgA antibodies. Correlation analyses are performed in the naïve cohort and spike protein‐specific IgG and IgA antibody concentration and anti‐SARS‐CoV‐2 neutralisation titres are compared for each person at each blood donation (n = 176). Correlation plot between reciprocal neutralising titres and spike‐protein‐specific IgG (A) or IgA (B) and antibody titres. (C) Correlation plot between neutralisation and a combined IgG and IgA factor (the product of IgG and IgA concentrations). (D) Correlation plot of IgG and IgA. Spearman correlation coefficients (ρ), 95% CI values and P values are indicated above the graphs and plotted as hatched linear regression lines with shaded 95% CI. CI, confidence interval;IgA, immunoglobulin A; IgG, immunoglobulin G; SARS‐CoV‐2, severe acute respiratory syndrome coronavirus 2 [Color figure can be viewed at wileyonlinelibrary.com]