Fig. 4: Representative dynamic changes in antibody responses (anti-RBD IgG, anti-RBD IgM, anti-RBD IgA, anti-N IgG and MN titres) in 33 COVID-19 patients during acute infection and the convalescent phase.

Only patients who got measurements at more than three timepoints with follow-up at day ≥300 are shown. Specimens with MN titres <10 were assigned a value of 5. Black and green dotted lines indicate the limit of detection for anti-RBD IgG and MN titres, respectively.