Characterization of ZIKV infection in immunocompetent BALB/c mice. (A) Experimental design indicating the time points of serum samples and lymphoid tissue collections. (B) Spleen weight measured at the time of collection, as indicated. (C and D) Total serum IgM (C) and IgG (D) from infected (ZIKV) and control (MOCK) mice, measured by ELISA. (E–G) Levels of IgM and IgG specific for viral surface antigens were measured by ELISA (1:120 dilution) using VLPs and recombinant domain III of ZIKV envelope protein (EDIII). (H and I) Levels of IgM (H) and IgG (I) specific for NS1 protein were measured by ELISA (1:120 dilution) using recombinant ZIKV NS1. Data are representative of three independent experiments with 8–16 mice per group. Statistical analyses were performed using the paired two-tailed Student’s t test. *, P ≤ 0.05; **, P ≤ 0.01. Mice from different groups were compared using the unpaired two-tailed Student’s t test. ZIKV significantly different from MOCK: m*, P ≤ 0.05; m**, P ≤ 0.01; m***, P ≤ 0.001; m****, P ≤ 0.0001. Error bars represent SEM.