Morphological changes of DENV-1-infected Vero E6 cells treated with methanolic extracts of six medicinal plants at 7 days post infection. All the cells were viewed under inverted microscope at 200× magnification. (A) A. paniculata with75% of inhibition. (B) M. charantia with 50% of inhibition. (C) O. sanctum with less than 50% inhibition. (D) C. citratus with less than 50% inhibition (E) C. limon with no inhibition. Only cell fragments and debris were seen (F) P. citrosum with no inhibition. Granulation and cell densing were observed. The CPE for each treatment was compared with those of negative and positive controls shown in Figures 2 and 3, respectively.