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Human IgG and IgA responses to COVID-19 mRNA vaccines

Fig 2

Time course of spike antigen-specific IgA response to COVID-19 mRNA vaccine.

ELISAs were performed on serum from 4 subjects described in Table 1, at different time points after vaccination (X-axis, days). Serum IgA levels are proportional to ELISA optical density values (Y-axis). Each symbol represents average ELISA data for a single subject at a single time point. Scatter plots were fitted with a moving average trend line. Note 2nd vaccine dose was at day 28 for subjects 1–3, and day 21 for subject 4.

Fig 2

doi: https://doi.org/10.1371/journal.pone.0249499.g002