Figure 2.
Reduced serum neutralizing activity against Delta and Omicron (B.1.1.529) variants. (A–E) Comparison of serum neutralizing titers of uninfected unvaccinated individuals (light gray, A), all vaccinated individuals (dark gray, B), BBIBP-CorV-vaccinated donors (orange, C), WIBP-CorV-vaccinated donors (blue, D), and CoronaVac-vaccinated donors (purple, E). NT50 values against wildtype SARS-CoV-2 (square), and Delta (up-pointing triangle) and Omicron (B.1.1.529) variants (down-pointing triangle) were compared using Kruskal–Wallis test.