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. 2021 Oct 8;12:753435. doi: 10.3389/fimmu.2021.753435

Figure 4.

Figure 4

Antibody stability in saliva. (A) Saliva was kept at RT or at 4°C for respective durations (h) after collection and SARS-CoV-2 IgG concentrations were measured by saliva ELISA. Mean and standard error of the mean of 4 biological replicates is shown. (B) Collected saliva was subjected to freeze-thaw cycles and IgG concentrations were measured by saliva ELISA. IgG concentrations is shown as boxplots. Dashed line: Cutoff for antibody positivity.