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Antibody levels in SOTRs (red) and controls (blue). (A) Comparison between anti-N-IgG and (B) anti-S-IgG levels in SOTRs and controls. Positivity threshold level for anti-S-IgG ≥ 7.1 BAU/ml and anti-N-IgG ≥ 1.4 index (dotted lines). Bars indicate geometric mean with 95% confidence interval
