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Dengue and chikungunya are two important mosquito-borne infections which are known to occur extensively in tropical and subtropical areas. Presently, there is no treatment for these viral diseases.  In vitro  antiviral screening of 25 extracts prepared from the plants of  Vitex negundo ,  Plumeria alba ,  Ancistrocladus heyneanus ,  Bacopa monnieri ,  Anacardium occidentale ,  Cucurbita maxima ,  Simarouba glauca , and  Embelia ribes  using different solvents and four purified compounds (anacardic acid, chloroquinone, glaucarubinone, and methyl gallate) were carried out for their anti-dengue virus (DENV) and anti-chikungunya virus (CHIKV) activities. Maximum nontoxic concentrations of the chloroform, methanol, ethyl acetate, petroleum ether, dichloromethane, and hydroalcoholic extracts of eight plants were used. The antiviral activity was assessed by focus-forming unit assay, quantitative real-time RT-PCR, and immunofluorescence assays. Extracts from  Plumeria alba ,  Ancistrocladus heyneanus ,  Bacopa monnieri , and  Cucurbita maxima  showed both anti-DENV and CHIKV activity while extract from  Vitex negundo  showed only anti-DENV activity. Among the purified compounds, anacardic acid, chloroquinone and methyl gallate showed anti-dengue activity while only methyl gallate had anti-chikungunya activity. The present study had identified the plant extracts with anti-dengue and anti-chikungunya activities, and these extracts can be further characterized for finding effective phytopharmaceutical drugs against dengue and chikungunya.

In Vitro Antiviral Activity of Potential Medicinal Plant Extracts Against Dengue and Chikungunya Viruses