Objective: To established a rapid and sensitive method for evaluation of antiviral activity.Methods: The antiviral activity can be assesed as following: After the Hep 2 cells (at a dentisty of 2×10 5 seeded in 40 well tissue culture plates) were infected with CVB 3 and RSV and incubated for 1.5 h at 37 ℃. The virus were removed and different concentration of the test samples were added and incubatded again. When the cytopathic effect (CPE) could be observed at almost every test wells, 50 μl of the MTT s...