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Anti-SARS-CoV-2 seroprevalence of total immunoglobulin against SARS-CoV-2 RBD of the spike protein in (A) children aged 5–12 years, and (B) mothers aged 21–59 years. An average of seven children and six mothers were examined on each date. Exact numbers of individuals by date are shown in Supplementary Material Figure S1.
