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Subtypes of antibodies from SARS‐CoV‐2‐positive samples against the S1 protein. The subtype reactivity against S1 from 88 SARS‐CoV‐2‐positive samples was evaluated. Values are expressed as the OD(450), and significant differences are shown. Data were analyzed by the Kruskal–Wallis test, and multiple comparisons were performed with Dunn's test
