Fig. 3: ZKV induces cytopathic effects in astrocytes.

Human fetal astrocytes were infected with ZIKV strains MR766 or PRVABC59 at the MOI of 0.5 for the indicated length of time. a–i ICC of flavivirus antigen (green color) and GFAP (red color) was performed. DAPI (blue color) was used as a nuclear counterstain. Scale bar: 50 μm. j ZIKV-positive cells in a–l were quantified and shown as percentage of total cells in the culture. k Cell viability of the astrocyte cultures were determined by the CellTiter 96® AQueous One Solution Assay at every other day for 8 days. Results were normalized as percentage of mock-infected control at 2-day post infection. CTL control. Representative of three independent experiments was shown