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Anti-spike IgA is present in the plasma of centenarians and non-centenarians infected with SARS-CoV-2. Anti-S IgA was assessed in plasma samples collected from SARS-CoV-2 positive centenarians (Ai); SARS-CoV-2 negative centenarians (Aii); SARS-CoV-2 positive non-centenarians (Bi); SARS-CoV-2 negative non-centenarians (Bii). Endpoint titers for each group are summarized (C).
