Groups of randomized, mixed sex three- to seven-week-old Ifnar1-/- mice were subcutaneously inoculated with 103 PFU of ZIKV-WTic and NS1 mutants (n = 8-11/strain). Mice were observed daily for 21 days and morbidity (A), mortality (B) and viremia (C) were measured. No significant differences in morbidity or mortality were identified. Strain had a significant impacted on viremia levels (Two-way ANOVA, p = 0.02). Viremia was significantly higher for ZIKV-V982A at 2 dpi compared to ZIKV-WTic, yet significantly lower for ZIKV-A894G at both 2 dpi and 4 dpi (*t-test, p<0.05). Viremia levels of ZIKV-NS1dm were equivalent to ZIKV-WTic at both 2 and 4 dpi (t-test, p>0.05).