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Correlation of long existing SARS-CoV-2 load and immune reaction. Correlation of Ct value of ORF1ab or N and SARS-CoV-2 neutralizing antibody (A), B lymphocytes (B), CD4+ T cell (C), CD8+ T cell (D), NK cell (E), IFN-γ produced CD4+/CD8+ T cell (F, G), or NK cell (H).
