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. 2022 Mar 25;52(5):816–824. doi: 10.1002/eji.202149785

Figure 4.

Figure 4

Neutralizing antibody (NAb) titers to WT virus and four variants Alpha (B.1.1.7), Delta (B.1.617.2), Beta (B.1.351), and Omicron (B.1.1.529) 1 month after infection with WT, Alpha, or Beta variant and after one dose of Comirnaty COVID‐19 vaccine. Wilcoxon rank‐sum test *p < 0.05, **p < 0.01, ***p < 0.001. Each sample was tested as a technical duplicate in each experiment and 50% inhibition of SARS‐CoV‐2 infection observed by the cytopathic effect of inoculated cells is shown. The experimental precision was confirmed by two positive control samples in each independent experiment.