THF cells were left untreated or treated with indicated concentrations of DSDP or control compound G10 for 8 h. Cells were then infected with YFV, DENV, or ZIKV at MOI of 0.1 for 1 h followed by culture for additional 48 h. Total cellular RNAs were extracted to detect viral genomic RNA by qRT-PCR using β-actin as internal control (A, C and E). Values represented percentage to mock treated controls (mean ±standard derivations, n=3). Culture media were harvested and the virus titers (B, D and F) were determined by plaque assay and presented as number of plaque forming units per milliliter medium (PFU/ml) (mean ±standard derivations, n=3). UD, under detection limit. * indicates p<0.05 compared to mock treated control.