Figure 1.

Neutralisation activity in longitudinal serum samples from patients with COVID-19

(A) NT₅₀s for each sample collected at the visit indicated. (B) Relative NT₅₀ values in serum samples obtained at visits 1 to 5, normalised to visit 1; coloured horizontal bars indicate median values with 95% CIs; statistical significance was determined with the two-tailed Wilcoxon matched-pairs signed rank test. (C) Relative decay of NT₅₀ per day between visits 1 and 3 and relative decay of NT₅₀ per day between visits 3 and 5; red horizontal bars indicate the median; statistical significance was assessed with the Wilcoxon test. NT₅₀=half-maximal neutralisation titre.