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Serum ZIKV IgM (A and B) and IgG (C and D) at the indicated days postinfection in midtrimester baboons inoculated intravaginally with baboon semen containing either the FP or PR ZIKV isolate. The dashed lines represent the assay cutoff controls for IgM and IgG detection in each specific ELISA. The absorbance was read at 450 nm for IgM and at 405 nm for IgG antibodies (Abs) in serum.
