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Scatterplots showing the correlation between IgG measured from Mitra dried blood eluents and matched serum for Nucleocapsid (N) protein (a), receptor binding domain (RBD) (b) and Spike (S) protein (c) (n = 19) in median fluorescence intensity (MFI). The dashed lines represent the linear regression equation. R‐squared and P‐values are shown.
