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Samples were classified according to infecting strain (delta or omicron), pregnancy status, and vaccination status, and re-analyzed to assess differences in viral RNA level (A) and anti-S (ancestral/vaccine strain) IgG (B). Two-way ANOVA with Tukey’s multiple comparisons tests (A-B) *P < 0.05, **P <0.01, ***P < 0.001, ****P <0.0001.
