Higher correlation between neutralizing antibodies and surrogate neutralizing or binding antibodies in COVID-19 patients than vaccine recipients.

The differences in seropositive rates were statistically non-significant with clade S/wild type (Wilcoxon Signed Ranks test; p = 0.3170), but highly significant with the Delta variant (Wilcoxon Signed Ranks test; p = 0.001) ( Table 2 ).

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