C. A549 cells were infected with ZIKV (MOI=5) for 6 hrs and then transfected with ISRE- or GAS- promoter-driven firefly luciferase together with a constitutively active renilla luciferase construct. Sixteen hours later, cells were treated with IFN-α (100 U/ml) or IFN-α (10 U/ml) for 2 hrs. Cells lysates were harvested and relative luciferase activity from ISRE- and GAS-promoters were determined. Values are expressed as mean ± standard error. *P<0.05 (Student's t-test); N=3 