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Strong correlation between anti–SARS–CoV–2 spike total Ab (ECLIA) and NAb levels (sVNT) for both Wuhan and Omicron variants, the highest value was obtained when using the international standard (shown in red on the figure). Pierson r, Confidence interval, R2, and p values of sVNT results obtained using the percentage of signal inhibition, conversion tool, and international standards. (p < 0.05 and R2 = 0.5–1 were considered statistically significant) (bottom).
