Figure 1.

Severe acute respiratory syndrome coronavirus 2 neutralizing antibody titers to D614G-like viruses at baseline (prevaccination) and 14–28 d after each coronavirus disease 2019 vaccine dose among pregnant and nonpregnant participants (n = 108). A titer of 1:5 was assigned to participants with undetectable (<1:20) neutralizing antibody responses to vaccine. Error bars indicate the 95% confidence intervals of the log₁₀ titers. P values compare the log₁₀ titer between pregnant and nonpregnant participants at each timepoint. Abbreviations: CI, confidence interval; ID₅₀, inhibitory dilution of serum samples at which relative luminescence units were reduced by 50%.