| Summary: | <p>Abstract</p> <p>Background</p> <p>Dengue is a serious arboviral disease currently with no effective antiviral therapy or approved vaccine available. Therefore, finding the effective compound against dengue virus (DENV) replication is very important. Among the natural compounds, bioflavonoids derived mainly from plants are of interest because of their biological and medicinal benefits.</p> <p>Methods</p> <p>In the present study, antiviral activity of a bioflavonoid, baicalein, was evaluated against different stages of dengue virus type 2 (DENV-2) replication in Vero cells using focus forming unit reduction assay and quantitative RT-PCR.</p> <p>Results</p> <p>Baicalein inhibited DENV-2 replication in Vero cells with IC<sub>50</sub>= 6.46 μg/mL and SI= 17.8 when added after adsorption to the cells. The IC<sub>50</sub> against DENV-2 was 5.39 μg/mL and SI= 21.3 when cells were treated 5 hours before virus infection and continuously up to 4 days post infection. Baicalein exhibited direct virucidal effect against DENV-2 with IC <sub>50</sub>= 1.55 μg/mL and showed anti-adsorption effect with IC<sub>50</sub> = 7.14 μg/mL.</p> <p>Conclusions</p> <p>Findings presented here suggest that baicalein exerts potent antiviral activity against DENV. Baicalein possesses direct virucidal activity against DENV besides its effects against dengue virus adsorption and intracellular replication of DENV-2. Baicalein, hence, should be considered for <it>in vivo</it> evaluation in the development of an effective antiviral compound against DENV.</p>
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